RE: [CAD_CAM_EDM_DRO] cheap high speed servo control

Commercial sewing machines perform a similar function. They begin with
the needle up, spin up to x,000 rpms, slow and stop with the needle up
or down, as required. Repeat ad nauseum. Thought you might look into
some of their web sites to see the technology used (Phaff, Juki, Singer,
etc.). The older machines use a clutch motor with a stepper/servo to
position the needle. Newer ones uses servos only, I believe.

Sorry, for kicking a dead horse, just trying to help.

Regards,
JJ

Be Kind, Be Careful, Be Yourself

> -----Original Message-----
> From: Graham Stabler [mailto:eexgs@...]
> Sent: Tuesday, August 13, 2002 6:18 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] cheap high speed servo control
>
>
> I am currently designing a coil winding machine for small hot
> air bonded
> bobbinless coils, one thing I would like is a servo motor as
> the spindle
> to allow good speed control as well as angular control at the start of
> winding. i.e. I want to be able to drive it quickly (up to
> 3000rpm) and
> then use it more like a stepper motor during wire attachment etc.
>
> The gecko drive units look good but would I be correct in
> assuming that
> the servo could not be run at speeds as high as 3000rpm? The max step
> rate is 250khz so I suppose it depends on the encoder.
>
> Are there any other fairly cheap drivers that might allow me to drive
> the motor both at high speed and in step mode? I will
> probably run the
> machine from a microprocessor which will be given winding
> constants (no.
> of turns etc) via a pc link.
>
> Sorry if this is as clear as mud.
>
> Graham Stabler
>
> Addresses:
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> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
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