Re: [CAD_CAM_EDM_DRO] Re: CNC coil winder traverse

hi,

1. common metric acme screw is TR14x3 means diameter 14mm, lead 3mm.
2. i assume backlash is not a problem, as motion is unidirectional while
winding that coil
3. load would be very small, i hope you are not trying to wind coils
weighting several kilograms of 0.02mm wire.

as load is small, you could use general v thread threaded rod, and map
the lead error using a dial indicator or a digital caliper.

vajk

Graham Stabler wrote:

> 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 ?
>>
>>
>>
>
>
>
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