Re: CNC coil winder traverse

Looking at the common lead errors I didn't think the accuracy would
be up to it without direct feedback. The backlash also has to be <
0.01mm and I have not seen many ballscrews with really low lead and
backlash errors.

Graham


<davemucha@j...> wrote:

> Hi Graham,
>
> If the loads are light, as one might imagine they are with thin

wire,

> considder a 10 TPI leadscrew with a 200 SPR stepper and a Gecko and
> direct drive.
>
> That is 200 steps times 10 microsteps for 2,000 steps per rotation
> and the leadscrew makes that 20,000 steps per inch. There is the
> possibility of using a 400 SPR motor as well.
>
> At 2,000 SPR, that would be 0.0001 inches distance per step. the
> 0.01mm distance you are looking for is about 0.0003937 inches, so

the

> stepper is close to 8 steps per wire thicknesss (0.02mm)
>
> sorry for not using metric, but I imagine you would be able to get
> something similar and in metric so your final numbers would divide
> exactly into wire thickness.
>
> Dave
>
> PS: what are the common Metric ACME screw pitches ?
>
>
>