On 3/8/24 10:47, andy pugh wrote:
On Fri, 8 Mar 2024 at 02:29, gene heskett <ghesk...@shentel.net> wrote:
is there a way to make it ignore such a false trigger
during the first few milliseconds of the back to center move?
My probing routines do a fast probe onto the edge (G38.2) and then a
slower move out of contact (G38.4)
And I keep the result of the G38.4
That would imply a probe switch with some hysteresis. Mine has none. My
probe is a copper wire, may not be dead straight, so I run the spindle,
usually backwords but because it may not be dead straight, it makes and
breaks as the spindle rotates, purposely running the spindle at 2x the
servo rate. I re-read the docs just now, and it appears I should be
using G38.3, but how does that behave if the move is not achieved, as in
the move is too small to find contact?
The theory is that even a bent spindle is effectively a perfect circle
if it is rotating faster than the servo loop
This method is quite accurate, I can get repeat accuracy's 2+ digits
right of the decimal point in g21 mode if I search slow enough. Before I
do much of anything else I am curious to see how much deviation I have
from a dead straight line. Using subroutines makes that easy enough to see.
Thanks Andy.
Take care & stay well.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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