-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brian Michalk
Sent: Friday, October 19, 2007 3:41 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Off Topic -- Centering a lathe piece
Is there an old trick to turning a part exactly on center?
If this venue is not the right place, I would appreciate a pointer to an
active group that could help me.
I have 12mm precision round shafting. I need to turn down one end of it
to .25 inches diameter.
I have a four jaw chuck, and center to within .001", but when I hard
couple a stepper motor to this part, it binds due to the .25" boss not
being exactly on center.
I do have a spider coupling, but would rather go direct due to the added
size of the coupling.
Is there some "trick" someone could enlighten me with?
Hi Brian,
Your probably need to do better than .001" TIR on the boss, but even when
you get that good enough, not using a coupling will result in premature burn out
of the stepper bearings. This is because the bearing have even smaller
clearance, and the stepper motor parts might have a different TIR phasing from
your part.
I read somewhere that the Old Timers used two wrenches on a four jaw
wrench, hand rotating the spindle by 90 degrees with both wrenches inserted.
They would loosen one and tighten the other until they got the indicator dead on
concentricity. So, go make yourself a second chuck wrench.
73, Don...
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