Re: Timing Pulley Accruacy and Servo shaft runout

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "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.
>
> 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

5 thou ? on a new motor ? I shudder to think that is even possible !

I would think that is scrap from the trash bin of the QC department.
or it fell on the floor from the top of the rack.

Dave

>