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Step Gauge improve accuracy of CNC

Using Step Gauge (check master) to improve the accuracy of CNC Machine

Currently, many companies use laser Interferometers to verify the positional accuracy of CNC machine. But, if we only verify the accuracy by laser interferometers at the production field which have a poor environmental conditions, the result would be not precise because of the temperature, wind, humidity. For instance, one day check out one machine, the result would have a big difference at AM9:00 and PM3:00.


 

In order to solve this issue, more and more companies are now using the Step Gauge to test the CNC Machine, especially using high precision step gauge. Because it has the same expansion coefficients as the CNC Machine.

 

It is really a misunderstanding that Step Gauge is old which can not compare to the laser interferometers. The coordinate measuring machine is a top grade machine than CNC. And now both ISO 10360-2:2009 and GB/T 16857.2-2006 are strongly recommend to test the coordinate measuring machine by Step Gauge.

 

Another instance, there is a Chinese company who purchased a 3m coordinate measuring machine from ZEISS of German, the ZEISS’ engineers used a 1m step gauge to inspect and calibrate this machine which sited in workshop.

(1) Step Gauge VS Laser interferometers

Contrast factor

Step Gauge/Step Gage/Check Master

Laser Interferometers

Accuracy

Both of them almost have the same accuracy when they have been placed under a standardizing laboratory. But there are many factors which will affect the function of Laser Interferometers such as temperature, humidity, material properties. And it requires a high technological level for the operators. The measuring accuracy of Laser Interferometers will reduce too much once it is got out of laboratory. You can compare the date from AM and PM.

Step Gauge has same expansion coefficients as the machine which has been testing. So it can give a practical and precision result.

Date Consistency

The coefficient of thermal expansion of step gauge is same as grating ruler. We only need to put it together (face to face) with the machine and wait them to cooling, by this way can totally eliminate the measuring error caused environment temperature variation. So it has a good date consistency.

The Laser Interferometers doesnt have coefficient of thermal expansion. (big different from grating ruler), very sensitive for the temperature even with temperature sensor.

Repeatability

Step Gauge better than Laser Interferometers

Date Drifting

Step Gauge better than Laser Interferometers

Stability

Step Gauge better than Laser Interferometers

Require the operator

One person with common technical

At least two person, special trainning

Carry

Easy, convenient

hard

Calibration Cost

Low

High

Item Cost

Cost of Step Gauge is almost 1/10 of Laser

Maintaining

Simple

Complex

Operating Life

Step Gauge longer than Laser Interferometers

Author: Andy Wang

Date: 2013-12-20

Email: trade2@anyii.com

Website: www.anyimeasuring.com

 

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