Re: [CAD_CAM_EDM_DRO] Re: Timing Pulley Accruacy and Servo shaft runout

ballendo <ballendo@...> wrote:
Now I'm going to disagree with an original reply here; which said
you did not want to try to compensate for your shaft runout with the
pulley--by turning it upon the shaft before locking it down.

It is a VERY good idea to do such things when you can. Tolerances
are tolerances, and they DO stack up. If you can adjust some part of
that stackup to reduce its overall value, it's a good thing.

Ballendo

//That was probably my post you are referring to. Everyone has there own ways of doing things. First of all, in mounting something on a shaft for concentricity this is a no-no. Simply boring the pulley off center to accomodate for shaft run-out is not a "fix". If the reason of the run-out is the shaft being bent(more than likely), not only is there runout, the shaft is also angular to the true axis of the device. Now bore a pulley off center however, the bore is parallel to the OD. The pulley, even though now concentric, will wobble.

If the motors are new, I'd return them. Or find a replacement. If those aren't an option and If it bothered me enough, I'd remove the armature dial it up between some centers and straighten them in a press. If it's only a few thou run-out and it being a milling machine, I'd just use them and not worry about it, unless it causes a problem. My guess, it won't.

Ron



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