Re: Timing Pulley Accruacy and Servo shaft runout

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@...> wrote:
>
> Hi Scott,
>
> > When you say anything below .0005" should be fine, did you mean
> > anything below .005"??
>
> I meant 0.0005" linear error at the screw.
>
> > If I did the math right, using the runout of .005" with the
> > motor pulley being 1" approx dia., I get an error of almost
> > .008". This almost sounds like too much error for that runout.
> >
> > (.005/(3.14*1))*5 = approx .008
>
>
> Sorry, we have a small metric/inch conversion problem. When I specified
> the pitch I meant distance/turn (all metric threads are specified this
> way), rather than TPI. I tend to think mainly in metric. Also you need
> to use the driven pulley, not the motor pulley. In the end you should
> find that the error is tiny.
>
> Les
>
>
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