Re: Servo as a Sherline spindle motor ?

Hi Alan,
You may wish to ask this on the Mach forum. As I recall, using the PP is a
stable process for spindle index (1 pulse per rev) up to either 3K or 5K
rpm. I'm setting up my lathe using a SmoothStepper, which has a much higher
capability. The only potential downside is that the SS is technically still
in development. This is not an issue for me but may be for some folks, as
it doesn't yet have complete duplication of PP functionality.

Thanks,
Andrey Lipavsky
Essex Jewelers
490 E. McMillan St.
Studio 205
Cincinnati, OH 45206
Phone (513) 826-0240
Fax (866) 653-9702
www.essexjewelers.com


From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Alan Rothenbush
Sent: Sunday, December 21, 2008 11:55 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Cc: andrey@...
Subject: RE: [CAD_CAM_EDM_DRO] Re: Servo as a Sherline spindle motor ?


Thanks for the note; in fact, you bring good news ! It means the motor
I've picked is an appropriate size.

You see, I have a pretty old Sherline with the variable speed _AC_ motor
right out of a small sewing machine, the speed control no more
sophisticated than a cheap light dimmer.

I'm quite sure what I'm planning will be an upgrade.

I'm curious about your statement about tradeoffs re: interface device. I
was planning on just using the parallel port. Am I missing something ?

ALan

> Hi Alan,
> You may wish to review the specs on of the Sherline motor
> currently powering your lathe.
> http://www.sherline.com/dimen.htm Look at the bottom third of
> the page. You seem to have selected a replacement motor
> that's almost identical to the motor you wish to replace. :-)
>
> By the way, Mach3 supports spindle encoders just fine. There
> are many who are doing this now and I'm in the process adding
> it to my lathe. There are some trade-offs, depending on
> whether you're using a PP, SmoothStepper, or other interface
> device. Short story is that it works well enough for the
> production guys to speak well of it.

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