On 12/07/2020 05:11 AM, Gene Heskett wrote:
Just one problem. I've not measured it, but I believe the backlash move
may be done the instant motion issues the reversal, so it takes place
during the spindle slowdown as its still spinning fwd. This results in
the resultant thread being cut sloppy as that move is about 2
thousandths of an inch. And its really obviously almost stripped for a
fine thread.
Now comes the improvement request for two more pins into motion.
I need a pin to disable the backlash move, until the spindle has actually
stopped.
Well, just another reason backlash compensation really "just
doesn't work". Not that the code is bad, the whole concept
is just WRONG! The ONLY place it mostly works is in X-Y
drilling operation, where the machine table has tons of
friction. In ANY operation where coordinated axis motion
happens, then the backlash compensation makes things worse.
Tighten up the machine as much as you can, and then maybe
put a springy tap holder in the spindle to compensate for
the backlash.
Jon
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