RE: [CAD_CAM_EDM_DRO] Re: stepper vs servo

If I can butt into the conversation -

No CNC system, regardless of how "good" or expensive it is, makes a part
exactly like the drawing calls out. It only comes close. Sometimes so close
that you can't measure a difference, but errors are still there. You are
correct in believing that the computer can direct the X motor to act only
AFTER it detects that the Y Motor is not at its correct location, and, by
that time, the "damage" is already done. The issue is how small a deviation
will be detected whether or not that deviation is within the tolerance
requirements of your parts. It matters not whether or not you are dealing
with servos or steppers. Perfection is unobtainable. Think tolerances and
"how close is good enough?"

Just my $0.01999997 worth!

-- Jerry


| -----Original Message-----
| From: cadcamcenter@... [mailto:cadcamcenter@...]
| Sent: Wednesday, August 08, 2001 4:42 AM
| To: CAD_CAM_EDM_DRO@yahoogroups.com
| Subject: [CAD_CAM_EDM_DRO] Re: stepper vs servo
|
| My feeble mind: The only way that X will know Y has slowed down is
| when Y has already slowed down and a signal is issued that this has
| happened, by which time X may already have proceeded some steps
| beyond Y? By which time there will already be some deviation, even if
| minute, from the planned path? Is the answer below:
|