On Saturday 02 November 2013 15:10:16 Jon Elson did opine:
> Gene Heskett wrote:
> > 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 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.
>
> You should use Halscope to record the spindle position and the Z
> position. If it is doing what you say, there should be obvious steps
> and flats in the Z position. Or, if there are steps and flats in the
> spindle pos, then it is the spindle encoder that is going erratic.
That I suppose could be, there is something funkity in the cable if its
hanging precisely so where it comes out from under the change gear cover,
bothers me very occasionally, and I thought about that, but the pulses from
the encoder are present and functioning as I can see the LED's for that
from my position as the C1G interface is visible to me.
> What version of LinuxCNC are you using, and what hardware interface for
> the motion?
Next to last build, 2.5.3.37, it crashed last night as it was about to
install the latest 2.5.3 from the buildbot. I've now installed 2.5.3.45.
Motors are all steppers. a 425 geared 2/1 on Z, and a 252 on X, direct.
And it did that, and one other really odd thing after I had rebooted it
just now to play some more. I saw both that, and about a 2 minute pause
that is not in the code, just once.
I did find the source of a funny rattle while the spindle was running, it
seems that I had chosen to run at the exact speed where the wcomp.1 that
helps stage the braking and detect a nearly stopped (15rpm) condition so
its safe to reverse things, was rattling one of the braking relays, so I'll
need to lengthen my legendarily long hal file some more and interlock the
braking relays so they are only enabled when actually stopping. The relay
had no effect on the motor as its connection is the back side of the run
relay. But the rattle of the ice cube was pretty plainly audible. Sounded
like the back gearing had sand in its craw. :)
Thanks Jon.
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)
In Oz, never say "krizzle kroo" to a Woozy.
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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