Measuring how much backlash exists in your machine axes can be done using indicators, lasers, ballbars and a range of other measuring devices.
All we are really measuring is how much motion is lost when direction is changed.
This value is entered in the machines parameters, so when an axis changes direction, it compensates the amount in the parameter to determine when the axis will physically move.
The value of the parameter is usually in millimeters.
Below are the common parameters and program to run backlash test.
Fanuc
0 control:
- X=535
- Y=536
- Z=537
- 4th=538
3 control:
- X=53
- Y/Z=54
- Z=55
6 control:
- X=115
- Y/Z=116
- Z/3rd=117
- 4th=118
10,11,12,15,16,18, 21,16I,18I,21I:
- XYZ=1851
Siemens
808D
- X=32450[0]
- Y=32450[0]
- Z=32450[0]
- 4=32450[0]
810D:
- X=32450[0]
- Y=32450[0]
- Z=32450[0]
- 4=32450[0]
802D control:
- X=32450[0]
- Y=32450[0]
- Z=32450[0]
- 4=32450[0]
828D:
- X=32450[0]
- Y=32450[0]
- Z=32450[0]
- 4=32450[0]
Heidenhain
410 TNC
- X= 710.0
- Y= 710.1
- Z= 710.2
- 4= 710.3
426 TNC
- X= 710.0
- Y= 710.1
- Z= 710.2
- 4= 710.3
530 TNC
- X= 710.0
- Y= 710.1
- Z= 710.2
- 4= 710.3
2500B TNC
- X= 710.0
- Y= 710.1
- Z= 710.2
- 4= 710.3
