6 – 494 HEIDENHAIN Technical Manual TNC 426, TNC 430
7. Compensate the static friction:
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7 Enter the backlash, if any exists.
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7 Enter the following test program (static friction in the Y axis):
LBL 1
L X+400 IY+0.5 R0 F200
L X0 IY+0.5 R0
CALL LBL1 REP 100/20
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7 Set the machine parameters:
• MP1511.x = 0
• MP1512.x = 20
• MP1513.x = 0
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7 With the integrated oscilloscope, display the following error in the Y axis
(Y SDIFF).
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7 Start the program and adjust the feed rate override so that the following
error caused by static friction becomes visible.
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7 Increase the feed rate until the following error is no longer measurable.
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7 From the current contouring feed rate, calculate the feed rate specific to the
Y axis and enter the value in MP1513.1.
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7 Adjust the feed rate until the following error is measurable again.
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