Keywords: Equator, CMM, CMM, selection criteria, comparative measurement, workshop measurement

Many factories encounter the same problem when expanding their testing capabilities: should they buy a CMM coordinate measuring machine or an Equator comparator? These two types of devices are both called “measuring devices” and can measure dimensions and produce reports, but their positioning is completely different – CMM three coordinate is an “absolute measurement” device, traceable according to ISO 10360-2 standard, suitable for high-precision arbitration measurement in a constant temperature measurement room; The Equator comparator is a “relative measurement” device based on the master part comparison principle, with a repeatability of ± 2 μ m (2 σ) and a working temperature of+5 ° C to+50 ° C (Equator 300 is+10 ° C to+40 ° C). It does not require constant temperature and can be directly placed in the machining workshop for high-speed batch testing. The relationship between the two is not about “who replaces whom”, but rather about complementary division of labor: CMM is responsible for benchmark calibration and arbitration, while Equator is responsible for high-frequency batch judgment in the workshop. This article provides 5 judgment criteria – batch size, accuracy requirements, temperature environment, cost budget, and replacement frequency – to help you match them and explain the selection logic in one go.

1、 Core concept: First distinguish between “absolute measurement” and “comparative measurement”

What is CMM three coordinate system

CMM (Coordinate Measuring Machine) is a type of universal measuring equipment based on the principle of “absolute coordinate measurement”: the probe moves in three-dimensional space, contacts or scans the surface of the workpiece, the system records the coordinates of the probe center in the machine coordinate system, and then converts them into the dimensional and positional errors of the measured features. The accuracy of CMM is endorsed by international standards – the length measurement error is evaluated according to ISO 10360-2 (for example, the accuracy index of a typical bridge machine is on the order of 1.5 μ m+L/300), and the calibration chain can be traced all the way back to the national metrology benchmark. Due to its high precision and strong universality, CMM is widely regarded as the “highest judge” of the factory measurement system: supplier delivery acceptance, customer audit arbitration, and standard part calibration all rely on CMM data.

But CMM also has its own “personality”: in order to achieve accuracy, it is usually placed in a constant temperature measurement room (20 ° C ± 1 ° C is a common requirement), the workpiece needs to be sent from the workshop to the measurement room, and the measurement of a piece needs to wait for temperature balance. The detection cycle is measured in minutes or even hours. For mass production, “sending CMM” means that the testing pace cannot keep up with the production pace, and many factories have formed the habit of “sending the first piece for testing and relying on inspection tools for the process” – but inspection tools only answer qualified/unqualified, and cannot answer trends.

What is an Equator comparator

The Equator comparator takes a different path: it does not pursue “absolute accuracy”, but rather “consistency with the benchmark”. Its working method is to first calibrate a master part with CMM, and use the various characteristic values of the master part as benchmark data; After establishing a benchmark (mastering) for Equator measurement standard parts, the production parts are measured in batches, and the deviation of each feature relative to the benchmark is output to determine whether it is qualified or not. When the ambient temperature changes, re mastering (which takes about the same amount of time as measuring a production part) can be performed to “reset”, so it can work stably in a workshop environment of+5 ° C to+50 ° C (Equator 300 model is+10 ° C to+40 ° C), without the need for a constant temperature room.

The Equator’s repeatability index is ± 2 μ m (2 σ), which is maintained throughout the entire temperature range. Long term comparison data from actual user forums shows that Equator and CMM have been continuously compared for 9 months, and the result deviation remains stable at ± 0.0001 “to ± 0.0002” (approximately ± 2.5 to 5 μ m) – that is to say, Equator is reliable for the goal of “maintaining consistency with CMM results”.

1.3 The two are not substitutes, but rather the division of labor between “referees” and “border judges”

If we compare the measurement system to a game: CMM is the chief referee, responsible for the final judgment (arbitration, acceptance, calibration benchmark); Equator is a linesman responsible for making frequent and quick judgments during the game (production process). A typical collaborative process is:

“`CMM calibration standard parts (establish benchmark) → Equator workshop batch comparison (daily high-frequency testing)→ Discover abnormal parts → Send to CMM for arbitration review → Regularly use CMM to recheck standard parts (maintain benchmark validity)“`

The significance of this division of labor is to liberate CMM from “daily inspection” and allow it to only do a few high-value tasks that it should do. Fulin’s case is very typical: the inspection of engine parts has been shortened from 6 minutes in CMM to 1 minute in Equator, reducing measurement time by 80% – the saved 5 minutes per piece, multiplied by the annual output, is the production capacity.

1.4 Boundary description of this article

This article only compares the selection logic of two types of equipment, the “CMM Three Coordinate (Universal Bridge/Longmen, Typical Configuration)” and the “Renishaw Equator”, and does not involve the evaluation of the advantages and disadvantages of specific brands. The CMM related descriptions in the article are based on the industry’s typical level, and the specific performance is subject to the official technical information of each brand.

1.5 Three levels of detection strategy: first think clearly about “how to measure”

Before entering the 5 criteria for judgment, there is another preliminary question worth pondering: What is your detection strategy? The detection strategies in the industry can be roughly divided into three levels:

First Article Inspection: Test the first piece of each batch of parts before processing to confirm that there are no problems with the machine tool, cutting tools, and program before mass processing. The frequency of first article inspection is low (1 piece per batch), but the requirement for “absolute correctness” is high – this is more suitable for CMM, because the first article needs to confirm whether the “absolute size is correct”, rather than “how much deviation from the relative reference”;

In Process: During the machining process, random or full inspections are conducted at a fixed frequency to detect process drift (tool wear, thermal deformation). This type of detection has a high frequency, pursues speed and stability – this is the home field of Equator, and when combined with IPC, it can directly feedback deviations to the machine tool;

Final Inspection/Delivery Acceptance: The final confirmation before shipment requires a traceable report, usually based on CMM data – this is also an irreplaceable scenario for CMM (or X-500 absolute mode).

Classify and count the inspection tasks according to these three levels: if “process inspection” accounts for a high proportion (which is the case for most machining plants), the selection answer is already in the air – process inspection is handed over to Equator, and first and final inspection are left to CMM (even if outsourced). This classification action can better guide decision-making than directly comparing the parameters of two devices.

2、 Technical explanation: essential differences between two types of devices

2.1 Accuracy System: Absolute Accuracy vs Repetitive Accuracy

This is the most confusing and influential factor in selection. The two types of devices answer different questions:

CMM answers’ What exactly is this size? ‘– Absolute accuracy, evaluated according to ISO 10360-2, traceable to national metrological standards;

Equator’s answer is “How much does this size differ from the reference and whether it meets the requirements?”– repeatability accuracy and consistency of comparison, ± 2 μ m (2 σ), valid throughout the entire temperature range.

If only compared to the “nominal accuracy”, CMM is usually more “good-looking”; But what production testing really cares about is whether the judgment is stable and reliable, and whether it is consistent with the arbitration result. The precision value of Equator is precisely reflected here: its ± 2 μ m repeatability is maintained in the workshop temperature environment and during batch continuous measurement, rather than in a constant temperature laboratory. Buying Equator is not about “absolute accuracy”, it’s about “judgment stability in workshop environment”.

Measurement uncertainty and GR& R: A ‘physical examination’ must be done before selecting a model. Whether it is CMM or Equator, selection should not only be based on the manufacturer’s nominal accuracy, but also on measurement system analysis. The common practice in the industry is GR& Research on R (repeatability and reproducibility of measuring tools): Take 10 workpieces covering the tolerance range, and have 3 operators measure them 2-3 times each. Calculate the percentage of variation in the tolerance zone. The general criterion is: GR& The R result is considered excellent if it accounts for less than 10% of the tolerance zone, acceptable if it accounts for 10% to 30%, and the measurement system cannot support the determination of this tolerance if it exceeds 30%. In practice, the lesson learned from many factories is that the equipment has a high nominal accuracy, but the clamping method, part deformation, and operational differences have increased the actual measurement deviation by several times. Therefore, it is recommended to request the supplier to cooperate in making a GR& R – Use your real parts, real clamping methods, and real operators to measure the true capabilities of this system, and then make decisions based on tolerance zones. This action is applicable to both CMM and Equator, and often exposes the hidden danger of “equipment selection is not a problem, but fixture scheme is problematic” in advance.

2.2 Dual mode model: Equator-X 500 blurs boundaries

It should be noted that the Equator-X 500 is a “two legged walking” model that offers two modes simultaneously:

pattern precision metric scanning speed Purpose

:– :– :– :–

Absolute mode According to ISO 10360-2 traceability: length measurement error ± 2.1 μ m+L/300 (18-22 ° C); ±2.6μm + L/180（18～26°C） Maximum 250mm/s No need for absolute measurement of standard parts, suitable for multiple varieties and small batches

Comparison mode Comparison uncertainty ± 2 μ m (2 σ) Up to 500mm/s High speed batch comparison based on standard parts

That is to say, if your working conditions are between “absolute measurement” and “high-speed comparison”, the X-500 provides a win-win choice: run the rhythm in comparison mode for daily large-scale production, switch to absolute mode when absolute data is needed, and no need to separately equip a CMM. Of course, the absolute mode also has stricter requirements for temperature environment (18-22 ° C is required to achieve the best performance), and the selection should be based on one’s own workshop conditions.

2.3 Speed and beat: one for 6 minutes, one for 1 minute

The most intuitive difference between the two types of devices is the difference in detecting the beat. The measurement action of CMM itself is not slow, but the complete inspection cycle includes: transferring the workpiece from the workshop to the measurement room, waiting for temperature balance (especially for aluminum and plastic parts), clamping and alignment, programming execution, and report organization. Under a set of procedures, the testing time for a single item is measured in minutes. Equator is placed directly next to the machine tool, and the workpiece is measured immediately after processing. The scanning speed is 100mm/s (300 type) to a maximum of 250mm/s (500 type), and the comparison mode is up to 500mm/s (X-500). The detection cycle is compressed to the second level.

Quantify the beat difference: Assuming a CMM inspection cycle of 6 minutes and an Equator inspection cycle of 1 minute for a part (Fulin case data), with a daily production of 200 pieces and a sampling rate of 50% (100 pieces/day):

solution Single piece inspection time Daily testing time Annual testing time (250 working days)

:– :– :– :–

All sent to CMM 6 minutes 10 hours 2500 hours

Equator workshop inspection 1 minute 1.7 hours 417 hours

The same testing task reduced the annual time from 2500 hours to 417 hours – saving over 2000 hours, which is the production capacity released from the testing process. If the inspection is upgraded from “sampling inspection” to “full inspection” (a common demand when quality requirements are raised), the annual time consumption of CMM scheme will directly double to 5000 hours, which is almost unfeasible; And the Equator full inspection only takes 834 hours, still within the acceptable range of the production line. This is the weight of “detecting rhythm” in selection: it determines how aggressive your quality strategy can be.

Fulin’s case (CMM 6 minutes → Equator 1 minute) is not an exception: Tremec Mexico used Equator to inspect Daimler parts, reducing workshop inspection time by 85%; The testing time for NIMS training materials has been reduced by 85%. The common meaning of these numbers is: When detection becomes a bottleneck, move the “high-frequency repetitive detection” from CMM to Equator, and the beat is immediately released.

2.4 Environmental Adaptation: Constant Temperature Measurement Room vs Workshop Site

The optimal working temperature for CMM is usually around 20 ° C, and the measurement room requires air conditioning, constant temperature, shock resistance, and dust prevention; The working temperature range of Equator is+5 ° C to+50 ° C (Equator 300 model is+10 ° C to+40 ° C), without the need for constant temperature, and temperature changes are compensated by re mastering. The case of Kishan Auto shows that Equator still maintains accuracy in an environment with a temperature difference of 21 ° C, reducing detection time and cost by 80%.

For factories without constant temperature measurement rooms, this difference is decisive: buying CMM means building/renting a measurement room first (infrastructure+air conditioning+long-term electricity bills), while buying Equator means directly placing it in the workshop (covering an area of about 570 × 500mm, without the need for compressed air). The working conditions above 35 ° C in the southern summer workshop and above 5 ° C in the northern winter workshop are within the working temperature range of Equator 500/X-500; The working temperature of the Equator 300 model is+10 ° C to+40 ° C. If the 300 model is selected for the low-temperature workshop in winter, the actual temperature needs to be confirmed.

2.5 Programming and Flexibility: General Metrology Language vs. Specialized Comparison Process

CMM programming uses the industry standard DMIS language ecosystem (such as PC-DMIS, CALYPSO, and other third-party software, which belong to third-party compatibility solutions), and engineer skills are commonly used in the industry; Equator runs on the MODUS platform and has two entry points for programming: nodal CAD driver (no code required) and DMIS code. It also provides three benchmark establishment methods: CMM Compare (. CAL file, with the highest traceability), Feature Compare (manually entering feature values, suitable for quick production changes), and Golden Compare (direct calibration of metal parts, suitable for quick calibration).

It should be objectively pointed out that Equator’s comparison process relies on the standard part system: standard parts require CMM calibration, regular re inspection, and. CAL file workflow requires initial investment – if your factory does not even have a CMM, standard part calibration needs to be outsourced, and this part of the process cost needs to be included in the selection account.

2.6 Data Value: Reporting vs. Process Control

The output of CMM is the inspection report, which is used for acceptance, review, and arbitration; The added value of Equator lies in its ability to “connect to the production system”: through the IPC module, the measurement data is automatically calculated for tool compensation and written back to the CNC machine (writing # 10000 series variables), combined with sliding average compensation and standard deviation control limits, achieving a closed-loop process of “measurement → compensation”; The CHART report overlays the measurement points onto the CAD model; The data can flow to platforms such as Renishaw Central. For factories undergoing digital transformation, the difference in whether data can flow may be more worthy of attention than precision parameters.

From the perspective of data form, the difference between the two is more intuitive:

data dimension CMM Coordinate System (Typical) Equator comparator

:– :– :–

output format Test report (PDF/Excel), for acceptance and review purposes Real time judgment+trend data+CHART graphical report

Data frequency According to the inspection batch, low-frequency Following the production pace, high-frequency continuous

Linkage with machine tools Generally not available (offline) IPC closed-loop automatic update tool compensation

Regarding MES/Quality System Manual import or file docking Can be integrated with platforms such as Renishaw Central

Ultra poor positioning Numerical and positional annotations on the report Measurement points are directly overlaid onto CAD models for graphical positioning

This comparison reveals an easily overlooked selection dimension: do you need an “evidence” or a “data stream”. If the purpose of testing is to provide customers and auditors with traceable acceptance evidence, CMM’s reporting system is sufficient; If your goal is to turn detection data into input for process control (foolproof, warning, automatic compensation), Equator’s data flow architecture is naturally designed for this purpose.

3、 5 criteria for judgment: seated correctly

Standard 1: Batch size – Testing frequency determines equipment form

Large scale and repeated testing(testing dozens to hundreds of the same part every day): Equator has a clear advantage.. Once the program is built and the benchmark is calibrated, there is a high-speed cycle, and the cost of single piece inspection approaches zero;

Single piece, small batch(several parts per day, several pieces per type): CMM is more flexible and does not require a standard part system, allowing for immediate testing upon opening the box.;

Judgment method: Calculate the number of times each measurement program is repeated each month.. If it exceeds 50-100 times per month, the investment in the comparator is worth serious consideration; If the program is mostly disposable, CMM or X-500 absolute mode is more suitable.

Typical portrait comparison. Factory managers who tend to focus on “large quantities” have a few stable product models (such as supplying 2-3 part numbers to a certain host factory year-round), a monthly output of thousands of pieces, and mature processes with few revisions – these types of factory inspection tasks are highly repetitive, and Equator’s program reuse rate is extremely high, making them the optimal users for the comparator. Factories that tend to focus on “small batches” are characterized by a multi variety order system (such as molds, non-standard parts, trial parts), different part numbers for each order, frequent changes in drawings – the program is discarded after use, and the standard part system becomes a burden. The universality advantage of CMM is obvious. Factories between the two (with 10-30 varieties and dozens of monthly inspections for each variety) are suitable for the “CMM+Equator” combination and use the Feature Compare process to cope with production changes.

Standard 2: Accuracy Requirements – Should it be “absolutely accurate” or “stable” in judgment

Absolute dimensional data is required(delivery acceptance, customer arbitration, standard part calibration, final inspection with extremely strict tolerances): CMM is necessary, or X-500 absolute mode can be selected;

Need for rapid determination consistent with benchmarks(process control, batch screening, first article retesting): Equator’s ± 2 μ m (2 σ) repeatability accuracy is sufficiently reliable in workshop environments;;

Shape tolerance required(roundness, contour, runout): Both types of equipment require scanning probes.. Equator comes standard with SP25M three-axis analog scanning probe, with 1000 points/second sampling and complete shape tolerance measurement capability;

Judgment method: Look at the relationship between the tolerance zone on the drawing and the measurement uncertainty (usually requiring the measurement uncertainty to be no greater than 1/10 to 1/3 of the tolerance zone).. In scenarios where the tolerance is above ± 0.01mm and consistency is prioritized, comparative measurements are fully sufficient; When the tolerance is within ± 0.005mm or below, it is recommended to use CMM as the main tool and comparison as a supplement.

A practical reminder for precision requirements: Separate the “tolerance zone” and “feature type” when looking at them. A drawing often has both loose dimensional tolerances (such as ± 0.05mm length) and strict shape tolerances (such as 0.008mm roundness). When selecting, we cannot only look at the “strictest number”, but also count the “number of shape tolerance features and how strict the tolerance is”. If the roundness, contour, and runout markings on the drawing are dense and the tolerances are strict, both CMM and Equator require the equipment to be equipped with a scanning probe (Equator comes standard with SP25M three-axis analog scanning probe, with 1000 points/second sampling); If there are only a few discrete dimensional tolerances, point measurement configuration is sufficient. Separating the tolerance zone from the feature type for statistical analysis can avoid two extremes: it will not negate the comparison scheme just because there is a 0.005mm tolerance on the drawing, nor will it ignore the requirement of shape tolerance on scanning ability just because the overall tolerance is loose.

Standard 3: Temperature Environment – Is there a constant temperature condition

There is already a constant temperature measurement room: CMM can be fully utilized, and Equator can still be used (its wide temperature range is “tolerance” rather than “necessity”);

Without constant temperature conditions and large temperature fluctuations in the workshop: Equator’s working range of+5 ° C to+50 ° C is a hard indicator (300 type is+10 ° C to+40 ° C); CMM needs to first solve the infrastructure problem of the measurement room, and long-term electricity bills also need to be included in the cost;

Judgment method: Conduct on-site measurement of the temperature curve in the workshop for one week.. If the temperature fluctuation exceeds ± 5 ° C and there is no budget for renovating the measurement room, the selection conclusion will generally lean towards Equator.

A hidden detail of temperature factor: workpiece temperature balance. Many factories only focus on the operating temperature of equipment, but ignore the issue of temperature balance of workpieces. When metal parts come down from the machine tool, they carry processing heat (the surface temperature after milling and grinding may be several degrees higher than the environment), and direct measurement will introduce thermal expansion errors – especially for aluminum parts, where the coefficient of linear expansion is about 23 × 10 ⁻⁶/° C. A 100mm aluminum part with a temperature difference of 5 ° C will change in length by about 12 μ m. In the CMM scheme, after the workpiece is sent into the constant temperature measurement chamber, it usually needs to be “dried” for a period of time to achieve isothermal equilibrium, which is the invisible time consumption during the inspection cycle; Equator is placed in the workshop, with a short temperature balance time and a re mastering mechanism, which enhances its adaptability to “workpieces with residual temperature”. When selecting, it is recommended to use real workpieces for actual testing: immediately test once after processing, and then test again after 30 minutes. Compare the two sets of data to see which type of equipment has a more controllable “workpiece temperature sensitivity” in your scenario.

Standard 4: Cost Budget – Look at total cost of ownership, not bare metal price

The cost structures of the two types of devices are completely different:

cost item	CMM Coordinate System (Typical)	Equator comparator (typical)
:–	:–	:–
Equipment purchase	Increasing by precision level, high-precision models require significant investment	Depending on the model/configuration
Infrastructure	Construction of Constant Temperature Measurement Room and Air Conditioning, Seismic Foundation	No need for constant temperature, put it directly in the workshop
run	Measurement room constant temperature electricity fee, professional operator	No need for compressed air, low energy consumption (typical 80-100W)
standard parts	Not needed	Standard parts that require CMM calibration and regular re inspection
Testing manpower	Time consumption for inspection, waiting, and operation	Test on the production line, one click start on the operation interface
Replacement of gauges	Not directly replacing the measuring tool	1 set can replace multiple sets of hard gauges (Meyer Tool case: 1 set can replace ≥ 4 sets of gauges)

Of particular note is the return on investment brought by the replacement of gauges: Meyer Tool replaced at least 4 sets of specialized gauges with 1 Equator, and High Tech Engineering “did not produce a single scrap” after using Equator, reducing single piece production costs by 27%. For factories that invest heavily in gauges, Equator’s ROI is not only reflected in the testing process, but also in the entire chain of gauge design cycles, warehouse costs, scrap rates, and maintenance fees.

Judgment method: Calculate the accounts for the next 5 years together: equipment+infrastructure+operation+manpower+inspection tools, rather than just comparing two quotations..

Standard 5: Replacement frequency – program reuse determines investment and recycling

Long term production of a single variety: Equator’s ideal working condition.. The program and benchmark are established once and reused for a long time, with almost no production changes occurring;

Frequent switching of multiple varieties: CMM is more flexible; Equator can also quickly establish new part benchmarks through Feature Compare (manually entering feature values), while the absolute mode of X-500 does not require standard parts at all – but the programming workload during frequent production changes is still a real cost;

Judgment method: Count “How many part numbers have been produced in the past 3 months, and how many times have each part number been measured”. The smaller the ratio of the number of varieties to the total number of detections, the more suitable it is for Equator.

Details of the production change process: who will do it and how long it will take. The cost of product replacement is often underestimated. Here, we break down Equator’s product replacement action: programming is required for the first import of new parts (node based CAD driver programming, engineers can complete simple part programs in half a day to a day)+establishing benchmarks (if there are. CAL files, use CMM Compare; if not, use Feature Compare to manually enter feature values, a few minutes); When producing the same part again, simply call up the program and re master it (which takes about the same amount of time as testing a production part) to start batch testing. That is to say, Equator’s replacement cost is “high for the first time, low for the second time” – the more stable the part number and the more repeated the production, the lower the diluted replacement cost. This complements the cost structure of CMM, where each new part needs to be reprogrammed but does not require standard parts. The practical approach of multi variety factories is to classify varieties into “stable repetitive” and “one-time trial” types, with stable repetitive types handed over to Equator and one-time trial models left to CMM, so that the production capacity of both types of equipment can be fully utilized.

Decision Summary Table: 5 Standards per Table

criteria for judgment	Tend towards CMM	Biased towards Equator	Key data reference
:–	:–	:–	:–
batch size	Single piece/small batch, one-time program	Large scale, high-frequency program reuse	Fulin：6min→1min（-80%）
Accuracy requirements	Absolute size arbitration, tolerance ≤± 0.005mm	Prioritize consistency and ensure a tolerance of ≥ ± 0.01mm	± 2 μ m (2 σ) full temperature range; 9-month comparison deviation ± 2.5-5 μ m
temperature environment	There is a constant temperature measurement room	No constant temperature, large temperature fluctuations in the workshop	+5 ° C to+50 ° C (300 type+10 ° C to+40 ° C); Kishan Auto 21 ° C temperature difference maintenance accuracy
cost budget	Can bear the infrastructure and long-term operating costs of the measurement room	Limited budget and high investment in inspection tools	Meyer Tool 1 Taiwan substitution ≥4 Gauge；High-Tech cost -27%
Change production frequency	Frequent switching of multiple varieties	Long term production of a single variety	Re mastering only requires testing the time of one item

Instructions for using this table:Check each item one by one, and the direction will be clear if the column is checked more frequently.. If more than 3 out of 5 items are biased towards Equator, then “buying another CMM” is likely not the optimal solution; If precision arbitration and multi variety are essential, then CMM cannot be replaced – in reality, many factories choose “one CMM pipe benchmark+one or more Equator pipe workshops”, and the two work together instead of choosing one or the other.

Scoring example: A typical medium-sized machining factory. Assuming a factory produces three part numbers (2000 pieces per month) for an automotive parts supplier year-round, with drawings including roundness and contour markings (tolerance ± 0.015mm), no constant temperature in the workshop, moderate budget, and existing outsourcing CMM calibration channels. Score based on 5 criteria: batch size (3 varieties, high-frequency program reuse) → biased towards Equator; Accuracy requirements (priority for consistency judgment, tolerance ≥ ± 0.01mm) → biased towards Equator; Temperature environment (no constant temperature) → biased towards Equator; Cost budget (without measurement room infrastructure budget) → biased towards Equator; Frequency of production changes (few and stable varieties) → biased towards Equator. 5 items are all biased towards Equator, with clear conclusions: Equator 300 or 500 will be the main focus, outsourced CMM management calibration and arbitration will be conducted, and future decisions on whether to supplement CMM will depend on business volume. Put your own data into this table and go through it again, most factories’ answers will be much clearer than if you just took a snap of your head.

4、 Application scenarios and practical cases

4.1 Automotive Engine Parts: Fulin’s Beat Revolution

Fulin used Equator 300 to inspect engine parts, reducing the measurement time from 6 minutes in CMM to 1 minute, a reduction of 80%. The background is a typical “detection bottleneck” problem: CMM detects one piece in 6 minutes, the production line produces one piece in a few minutes, and the detection can never keep up with production. Equator is placed next to the production line, tested immediately after processing, and the results are obtained in 1 minute, transforming the testing from a bottleneck to a part of the process.

4.2 Daimler Parts：Tremec Mexico 的 85%

Tremec Mexico produces parts for Daimler, and the introduction of Equator reduces workshop inspection time by 85%. The pain points of this type of batch delivery factory are dense delivery nodes, constantly traceable testing results, and complete traceability records – Equator’s digital records naturally meet these requirements.

4.3 No constant temperature workshop: 21 ° C temperature difference measurement by Kishan Auto

Kishan Auto’s workshop does not have constant temperature conditions, with a temperature range of 21 ° C. Equator maintains accuracy in this environment, reducing detection time and costs by 80%. This case has the most reference value for most small and medium-sized factories in China that do not have constant temperature measurement rooms – ‘no constant temperature conditions’ should not be used as a reason to give up workshop level automatic testing.

4.4 Process Capability Enhancement: Cpk of Transmission Valve Body from 1.0 to 1.5+

Aluminum alloy die-casting transmission valve body, key aperture tolerance ± 0.015mm, using Equator+IPC closed-loop solution: real-time measurement data feedback to the machine tool, automatic updating of tool compensation, Cpk increased from 1.0 to 1.5 or above (this case is an industry public case, not an official customer case released by Renishaw). This case demonstrates the value of Equator beyond “detection” – it directly participates in process improvement through data closed-loop, which cannot be achieved by the traditional “sending CMM detection” model.

4.5 Aircraft Engine: CMM+Equator Collaborative Verification of Meyer Tool

Meyer Tool uses Equator in conjunction with SP25M probe to measure GD& The characteristics such as T-position, groove, aperture, contour, and runout have part tolerances of ± 0.025mm to ± 0.076mm. The measurement results are correlated and verified with CMM, and the inspection values must fall within 10% of the nominal tolerance. Note the pattern here:CMM has not disappeared, but has retreated to the position of “validation benchmark”– Equator is responsible for daily workshop operations, while CMM is responsible for regular associated validation.. This is the standard paradigm for collaboration between two types of devices.

4.6 Capacity bottleneck: Capacity growth of Senior Aerospace

Traditional testing relies on CMM and takes a long time, which restricts the production growth of Senior Aerospace. The introduction of Equator has increased production capacity; The case of Olympus NDT also shows a 30% increase in production capacity. When “slow detection” directly blocks “production capacity”, moving batch detection from CMM to Equator is one of the clearest paths for input-output ratio.

4.7 Collaborative Workflow Design: A replicable implementation solution

Based on the above cases, provide a landing path for factories preparing for “CMM+Equator” collaboration:

1. Benchmark establishment: Use existing CMM (or outsourced) to calibrate 1-2 standard parts and generate CAL file;2. Workshop deployment: Equator is placed next to the tested CNC machine, with clamping and positioning requirements within ± 1mm, without the need for special foundations;3.Program solidification: ODUS node based programming establishes a measurement program, Environment Manager verifies collision paths in a virtual environment, and the operator interface is launched with one click;4. Daily operation: The team checks according to the rhythm, re masters to deal with temperature changes, and marks abnormal parts for arbitration;5.Regular re inspection: Standard parts are sent back to CMM for re inspection every month (at least every quarter) to update benchmark data;6.Exception Arbitration: Equator judges workpieces that exceed the tolerance or have disputes, and sends them to CMM for final arbitration, forming a closed-loop evidence chain..

5、 Common Problems and Misconceptions

Misconception 1: “Equator accuracy is not as good as CMM, and the measurement is unreliable”

This confuses “absolute accuracy” with “consistency of judgment”. The value indicator of Equator is ± 2 μ m (2 σ) repeatability accuracy and “consistency with benchmark” – the deviation between the forum test and CMM remains stable at ± 2.5-5 μ m after 9 months of comparison. For batch production judgment, “stability and consistency with arbitration” is more important than “beautiful absolute values”. Of course, if your requirement is absolute size arbitration (such as final delivery acceptance), then CMM or X-500 absolute mode is indeed needed – this is precisely the problem that the “accuracy requirements” in the 5 judgment criteria need to solve.

Misconception 2: “Once you get on Equator, you don’t need CMM anymore

Equator’s benchmark comes from CMM calibrated standard parts, which also require regular re inspection; CMM arbitration is still required in case of disputes. The Equator system that completely deviates from CMM (such as using only Golden Compare) can quickly determine the feasibility of scenarios internally, but the evidence chain may be weak in scenarios such as customer audits and PPAP. The pragmatic approach is a dual track approach of “CMM+Equator”: CMM manages benchmarks and arbitration, while Equator manages high-frequency inspections in the workshop.

Misconception 3: “Small batch factories cannot use Equator”

The pain points of small-scale factories are “frequent production changes and multiple procedures”, which are traditionally considered to be Equator’s weaknesses. But Equator provides a means of relief: manually entering feature values in Feature Compare can quickly establish new benchmarks, the absolute mode of X-500 does not require standard parts, and MODUS node programming lowers the programming threshold to on-site engineers who can master it. Whether multi variety and small batch factories adopt Equator depends on the “program reusability” – even if the batch size of a single variety is small, if the variety is stable for a long time and the program is repeatedly used, Equator is still cost-effective.

Misconception 4: “Selection is about choosing equipment, buying it and installing it will make it usable

Equipment selection only solves half of the problem, the other half is the supporting system: where the standard parts come from (CMM calibration or outsourcing), who is responsible for programming, how to manage temperature, how often the standard parts are rechecked, and what process to follow for out of tolerance disputes. The same Equator can be used as a “process control node” in factories with sound supporting systems, while factories with missing supporting systems may still be used as “advanced gauges” a year later. During the selection stage, these five supporting facilities should be planned synchronously, and the acceptance terms should specify which training (operators, programmers), which documents (operation manuals, calibration processes), and which services (installation and commissioning, trial operation accompanying production, after-sales response) the supplier provides. The evaluation of equipment and supporting facilities together is considered a complete selection.

VI FAQ

Q1: Can Equator replace CMM?

It cannot be completely replaced, and we should not think like this. CMM plays the role of absolute measurement, standard part calibration, and dispute arbitration, while Equator plays the role of high-frequency batch testing in the workshop. If the factory does not even have CMM and the budget is only enough to buy one device, then it is necessary to distinguish its core requirements: prioritize final acceptance arbitration → CMM or X-500 absolute mode; Mainly focusing on process batch testing → Equator (standard part calibration can be outsourced). The most ideal structure is a collaborative system of one CMM and multiple Equators.

Q2: We already have CMM, do we still need to buy Equator?

First, let me ask three questions: Is testing a production bottleneck (is CMM queuing severe)? Do batch parts require high-frequency full inspection or high-frequency sampling inspection? Should the detection data be fed back to the machine tool? If the answers are all “yes”, the value of Equator is very clear: it liberates CMM from daily inspection, reduces the inspection cycle from minutes to seconds, and can also achieve process closure through IPC. Equator has an additional advantage on existing CMM factories: standard part calibration, regular re inspection, and dispute arbitration are all completed in their own factories, and the traceability system is complete and controllable.

Q3: Are Equator’s measurement results consistent with CMM?

The design goal of Equator is to “maintain consistency with CMM results”: its benchmark comes from the standard parts calibrated by CMM, and the comparison principle determines that it measures the “deviation relative to the benchmark”. The forum’s actual test data shows that Equator and CMM have been continuously compared for 9 months, and the deviation remains stable at the level of ± 2.5 to 5 μ m. Two points need to be noted: first, standard parts need to be rechecked regularly, as benchmark drift can lead to systematic deviations; The second is GD& The T results may deviate from specific brand CMM due to differences in benchmark feature simulators, and it is recommended to regularly cross validate key dimensions.

Q4: Our parts have a tolerance of ± 0.005mm. Can we use Equator?

± 0.005mm is a relatively strict tolerance, and selection should be very cautious. The general principle in the field of measurement is that the measurement uncertainty should be significantly smaller than the tolerance zone (commonly required to be 1/10 to 1/3 of the tolerance zone). The comparison uncertainty of Equator is ± 2 μ m (2 σ). For parts with a tolerance of ± 0.005mm (tolerance zone 0.01mm), the proportion of uncertainty is already significant. It is recommended to conduct a complete GR& Conduct research to verify feasibility and retain the CMM arbitration channel. Equator is usually a reliable choice for scenarios with a tolerance of ± 0.01mm or more.

Q5: We don’t have CMM, how do we calibrate standard parts?

There are three ways: firstly, entrusting qualified third-party metrology institutions/testing companies to calibrate standard parts with CMM and issue certificates; The second is to consult with equipment suppliers for calibration services (Renishaw authorized service providers can assist in docking standard part calibration, selection evaluation, and after-sales support); The third is to supplement a CMM when the budget allows in the later stage, and internalize all calibration, re inspection, and arbitration. Regardless of the method, the calibration certificate and re inspection record of standard parts should be properly archived, as they are the core of the traceability evidence chain.

Q6: Does Equator require a dedicated operator? Will it be very picky about people?

No dedicated metrology engineer is required. The operator interface (MODUS Organizer) of Equator is customized for each part. Operators only need to install the parts, press a button, and view the Pass/Tail results. The interface only displays the remaining time of the program, the current running result, and the last 10 statuses. The team workers can start working after one day of training. The programming side requires a dedicated person to master – however, MODUS’s node based CAD driver programming (no code required) lowers the programming threshold to a level that can be mastered by on-site engineers or quality control backbone, and only complex geometries require professional metrology programmers. Compared to CMM, which usually requires dedicated operators with DMIS programming skills, Equator has more “civilian” requirements for personnel, which is a real bonus for factories with difficult recruitment and fast personnel turnover.

Q7: We have decided to buy CMM, is it still necessary to see Equator?

It’s worth watching. The path of many factories is to first buy CMM to solve the problem of “being able to measure”, and then find that “testing is not fast” – CMM queues, sampling rates cannot be increased, and process data cannot be obtained. Equator’s positioning perfectly complements this link. Even if the budget is only enough to buy one first, it is recommended to evaluate Equator synchronously during CMM selection: if both are ultimately available, the standard part system, testing process, and data architecture can be planned at once to avoid repeated investment in the later stage. Conversely, for factories that have already purchased Equator, it is also recommended to plan CMM (or a reliable third-party calibration channel) – benchmarking, re inspection, and arbitration all require it. These two types of devices are not in a competitive relationship, but rather the two pillars of the measurement system. Which one to buy first depends on the most painful link at present.

7、 Configuration suggestions for factories of different scales

By applying the 5 judgment criteria to factories of different scales, three common configuration paths can be obtained for reference:

7.1 Small scale factory (1-3 CNC machines, no measurement room, limited budget)

Typical features: order system, wide variety, small batch size, no constant temperature measurement room, no dedicated metrologist. Suggested path:Starting with Equator 300 (or outsourcing first piece inspection), outsourcing standard part calibration to third-party metrology institutions, focusing on solving the “fast” and “stable” issues of process inspection;; After the business stabilizes, supplement CMM or upgrade X-500 to internalize the benchmark and arbitration. The advantage of this path is that the start-up cost is controllable, the effect is fast, and the detection capability grows synchronously with the business.

7.2 Medium sized factory (multiple CNC machines, simple measurement room, relatively stable products)

Typical features: 10-30 varieties, moderate batch size, existing CMM but serious queuing, and demand for quality system audit. Suggested path:“1 CMM benchmark arbitration+1-2 Equator workshop” combination, standard parts are calibrated by their own CMM, re inspected monthly, and form a complete traceability evidence chain; Equator is deployed next to the production line with the tightest pace, and works in conjunction with IPC to achieve closed-loop. This configuration is the most cost-effective “standard configuration”, and the vast majority of cases (Fulin, Tremec, Meyer Tool) belong to this structure.

7.3 Large scale factories/automated production lines (large batch sizes, multiple production lines, digital planning)

Typical features: large quantities, multiple production lines, robot loading and unloading, MES/quality system under construction. Suggested path:Equator multi deployment+Automate automation module+IPC closed-loop+Renishaw Central data platform, Equator embedded in automated production lines (such as the FANUC robot integration case in a factory in Texas) to achieve unmanned detection; CMM undertakes standard part calibration, regular re inspection, and dispute arbitration. In this structure, Equator has been upgraded from a “detection device” to a “process control node” and is one of the data entry points for the entire digital system.

The common logic of the three paths is that the ratio of CMM to Equator depends on the distribution of detection tasks – more arbitration tasks result in a higher proportion of CMM; When there are many process tasks, the proportion of Equators is higher. There is no universal “standard answer”, but there is a universal judgment method: first classify and count the detection tasks, and then score each item based on five criteria.

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pattern	precision metric	scanning speed	Purpose
:–	:–	:–	:–
Absolute mode	According to ISO 10360-2 traceability: length measurement error ± 2.1 μ m+L/300 (18-22 ° C); ±2.6μm + L/180（18～26°C）	Maximum 250mm/s	No need for absolute measurement of standard parts, suitable for multiple varieties and small batches
Comparison mode	Comparison uncertainty ± 2 μ m (2 σ)	Up to 500mm/s	High speed batch comparison based on standard parts

solution	Single piece inspection time	Daily testing time	Annual testing time (250 working days)
:–	:–	:–	:–
All sent to CMM	6 minutes	10 hours	2500 hours
Equator workshop inspection	1 minute	1.7 hours	417 hours

data dimension	CMM Coordinate System (Typical)	Equator comparator
:–	:–	:–
output format	Test report (PDF/Excel), for acceptance and review purposes	Real time judgment+trend data+CHART graphical report
Data frequency	According to the inspection batch, low-frequency	Following the production pace, high-frequency continuous
Linkage with machine tools	Generally not available (offline)	IPC closed-loop automatic update tool compensation
Regarding MES/Quality System	Manual import or file docking	Can be integrated with platforms such as Renishaw Central
Ultra poor positioning	Numerical and positional annotations on the report	Measurement points are directly overlaid onto CAD models for graphical positioning