Greetings all;
10.04 LTS + emc-2.4.3 from the just released cd is installed.
I've run into a puzzle in the z axis calibration. The exact same scale
factor I used for several years, is now moving the z too far. The X & Y
scales seem to be spot on within my ability to measure them.
So check me out here. The Z scale math:
8 u-steps on a 200 step motor = 1600 steps/rev
A 10 tpi acme bolt. = 16,000 steps per inch, but modify by
A 17 tooth gilmer pulley on the motor
A 42 tooth gilmer pulley on the nut carrier.
so SCALE = 39,529.411764
And this is the same figure I will get pulling in the backups from the 2.3.6
install.
But its moving about 1.189" for a commanded 1.0000" move.
reducing this to about 34.3xxxxx gets me close, maybe .0015" long yet per
inch. I gave up because my back was killing me. I haven't been kind to it
since the wind on June 24th.
I think my measuring tool, a grizzly .001" dial caliper mounted on a base
for measuring elevations, may not be any more accurate than the 10 tpi acme
bolt, but if I can get them to agree within a thou, I'd be happy as a clam.
Have I found a bug?
--
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)
"They are both businesses - if you have given them enough money, I'm
sure they'll do whatever the hell you ask:->"
-- David Welton
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