Re: Servo as a Sherline spindle motor ?

150 OzIn peak is about 9 ft/lb so you probably could stall it if you had a
better grip. Lacking a dyno (doesn't everyone have one?) maybe a reasonable
comparison would be to wear leather gloves and stall both motors with your
hand to see how they compare. You probably want the servo to be stronger
than the stock Sherline motor anyway to get the low-end torque for
threading. Quite a bit stronger I should think.
--
Phil Mattison

----- Original Message -----
From: Alan Rothenbush <alan@...>
To: CAD CAM EDM DRO <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, December 17, 2008 9:06 PM
Subject: [CAD_CAM_EDM_DRO] Servo as a Sherline spindle motor ?


> Thanks to all who responded to my question about my 5mm pulley bore. I
have some coming and I'll try to bore them out and cross my fingers.
>
> That pulley is destined for the end of a double-stack NEMA17 stepper that
will be used to drive the cross slide of a Sherline lathe that I'm FINALLY
getting around to CNCing properly.
>
> One thing I'd like to try on the Sherline is CNC threading.
>
> I see two ways to do this.
>
> 1. Put a servo on the spindle and write a bit of custom code; no real
problem, or
>
> 2. Put a nice fat motor on the spindle (so there's no worries about it
slowing down) and use one of the "spindle sensor" options.
>
>
> Option 1 is certain to work AND I have all the bits at hand; spare gecko
G320, a choice of servo motors, and some L series pulleys.
>
> The one little fly in the ointment is that the choices for servo motors
are
>
> . one that's SEEMS a wee bit small or
> . one that's WAY WAY WAY TOO BIG and would be wasted in this application.
>
>
> The smaller motor is an older EG&G Torque systems ME2610. It is
physically pretty close to the same size as the stock Sherline _AC_ sewing
machine motor, if that means anything. (It's an old lathe).
>
> I can find no specs on the PRECISE motor, but I did find some specs on a
similar motor from the same manufacturer (same dimensions, similar part
number). That motor is rated at 29 OzIn continuous, 150 OzIn peak. This
does not seem like a whole lot of torque to me.
>
> On the other hand, I can't stall it with 36 volts driving it by grabbing
the 1" pulley, so maybe 150 OzIn is more torque than it seems.
>
>
> Anyway, I'm looking for thoughts, opinions and experiences; all comments
gratefully accepted.
>
>
>
> Alan
>
>
>
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