RE: [CAD_CAM_EDM_DRO] How important are manual controls on CNC machines?

If you used a double shaft stepper you could mount a handwheel on the
back shaft for manual operation.
Dan
-----Original Message-----
From: jmkasunich <jmkasunich@...> [mailto:jmkasunich@...]
Sent: Friday, February 28, 2003 8:27 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] How important are manual controls on CNC
machines?



Hi All:

I have a Shoptask lathe/mill that I intend to convert to CNC. The
machine has a fine quill feed that is intended to be
driven by a stepper, but it is junk, with about 0.050 backlash.

I recently bought a surplus anti-backlash ballscrew (preloaded dual nut)
that is long enough for the quill. Last night I
finally sat down and designed the mount for it. The screw
is attached to the quill, and does not rotate. The nut is
attached to the millhead, runs in a double row angular contact bearing,
and is rotated by a timing belt pulley (2:1 reduction from the stepper).

The original fine feed shaft is parallel to the table. It
has a hand crank as well as the pulley, and could easily be used
manually when the stepper is turned off.

WIth the new design, the ballscrew and the stepper shaft are both
parallel to the quill (vertical). It will be very hard or impossible to
provide a hand crank in the available space.

Am I going to regret not having manual control of the quill?

I do have a scrounged jog wheel, which I intend to hook up to my CNC
system. So when the system is powered up, I can still move the quill
easily. But it will be very difficult to
adjust the quill when the CNC system is turned off.

John Kasunich



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