Now that you point it out I agree that I gained steps in Z when doing the photo engraving. It seemd fine about two thrids of the way through and then started diving deeper and deeper on each pass.
I was doing an XY engraving and it seemd that at one point each change in y drove the z deeper into the work.
I've done a bunch of these before with 3.x and never saw this. I will retry this engraving tonight with CV mode off and see what happens.
Ted Gregorius (Pres)
TAG Systems Racing Products, Inc.
www.tagrace.com
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----- Original Message -----
From: Digital audio Pro
To: mach1mach2cnc@...
Sent: Thursday, March 11, 2004 11:01 AM
Subject: RE: [mach1mach2cnc] Mach2 Missed steps but not????
Ted. All this is strange. i got my problems engraving a complex font with a
V cutter and version 4.0a (lots of vertical small moves). The strange thing
is the lost steps are not in the logical direction, i mean, with my Z spring
setup, i should lost step in the + direction, but in the end of the cut the
mill was too low, about 1 mm, that's a lot gained step, in the wroong
direction. Normally the losts step should be in the + direction, because of
the spring and the cutting forces.
I was using constant velocity too, and didn't try exact stop because it
would shake the table too much with my acceleration settings.
The lowering of Speed and acceleration seemed to solve partially the
problem, but i'm not sure he disapeared completely, because when i make a
verify position, i always get high gained step values, 2 or 3 times higher
than X or Y axis, and always in the same direction, this confirm it is not a
reference sensor repeatability problem.
Real mach2 problem or mechanical resonance.... ?? Anyone with similar
strange gain steps on Z axis, - direction ?
Olivier.
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