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

Polaraligned <polaraligned@...> wrote:

> It is always a good idea to bore a pulley out to size if you want
> accuracy. Often the supplied bore is quite a long way out. With flanged
> pulleys it is a bit of a drag turning up a fixture so you can hold them
> in the chuck but it is worth doing.
>
> Les

I put a test indicator on a few brand new Baldor servo motors.
Towards the end of the shaft the runout varied anywhere from
.002" to .005". This does not seem very good. Maybe you are
better off leaving the pulley bore off center and turning the
pulley to compensate for any shaft run out.

///Naa... Two wrongs don't make a right as they say. Are you sure they have .005" run out? Thats alot for that type of motor. Baldor's are good quality. You should be able to see that much run-out. It's possible the shafts are bent and if they are, I'd find some other motors. But, in retrospect, even a few thou. runout on a timing belt would probably be ok. Also if the indicator is showing that much movement, it's actually half that much in terms of run-out.
///

Can anyone quantify the effect that .005" runout would have
on the accuracy in a mill setting?
What kind of accuracy should I be shooting for as a minimum?

Thank You,
Scott








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