Greetings all;
A few months back I wrote a 'peck rigid tap' routine for use where the hole
was much deeper than the tap diameter, and for the job I asked it to do, it
worked well.
But, like any of those little bits & pieces, I tend to want to make it
universally applicable.
Initially setup it was hard coded to run Z to 3.4", then repeat the G33.1
command, asking it to advance into the hole an additional 1/2 turn per
repeat until it had tapped to the 2.9" point.
I also had a pre-stop of sorts because it takes a while to bring my spndle
to a dead stop, which was by subtracting the equ of 1.5 turns of the
spindle from the end point passed to G33.1 as the Z#<_var>.
But I am noticing when cutting air, that it seems to be uncoupling Z from
the spindle, stopping z short, turning the spindle around and picking the
synched Z move back up as it backs the tap out of the hole for chip
clearance. Cutting a real thread, this would probably break the 8-32 tap I
was using at the time. It seems to occur when the routine is about half
done, for several cycles, then goes back to the expected behavior for the
last few cycles of the routine. The first time it happened I thought I was
seeing things, but its just repeatable enough to convince me I'm not
totally wacko yet.
Two questions then:
1. Has anyone else noticed anything like this? Or am I the only one that
ever wrote a 'peck' style rigid tapping routine?
2. Since running the tap into the bottom of a blind hole would wreck
things, is there a way I could, from a signal in the .hal file, take a
snapshot of the z position and make it available to my code so that the
amount of z travel needed in order to coast to the correct depth on the hal
file sequenced reversal could be calculated?
Sort of an automatic compensation for spindle speed although this seems to
work well at about 150 rpm, and cranking it up to 500 revs makes it take so
much time turning around, coasting farther, such that it doesn't actually
do the job noticeably faster in wall time at the higher spindle speed.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Wasn't there something about a PASCAL programmer knowing the value of
everything and the Wirth of nothing?
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
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