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writing a post processor for older fanuc controller

smp4616

Plastic
Joined
May 9, 2015
Hi, I just got an older hardinge lathe with a fanuc21t controller, I'm modifying the post processor that came with bobcam for fanuc and am wondering how to go about making g32 work well with a floating tap holder. The machine doesn't have a spindle encoder so will not allow for rigid tapping. From what I read, the g32 command with a feed about .001 ipr less than the tap pitch works well with floating holders. What I am wondering is if it is possible to do some math in the post processor file (i.e. g32 z-.9 f(tap pitch - .001)) or will I need to write a macro and then modify the post processor to call the macro when the post specifies rigid tapping?
 








 
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