Re: Servo as a Sherline spindle motor ?

If you don't understand the difference you are in for a lot of
confusion, which seems to be where you are at.

Best to listen and keep your mouth shut. That way it's not so easy to
put your foot in it.

Phil

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Yahoo" <yahoo@...> wrote:
>
> If you say so. Anybody for a little game of nit-picking?
> --
> Phil Mattison
>
> ----- Original Message -----
> From: Andy Wander <awander@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, December 18, 2008 8:36 PM
> Subject: RE: [CAD_CAM_EDM_DRO] Re: Servo as a Sherline spindle
motor ?
>
>
> > Phil:
> >
> > It's in-lb or in*lb, NOT in/lb.
> >
> > ______________________________________
> > Andy Wander
> >
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Yahoo
> > Sent: Thursday, December 18, 2008 7:01 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Servo as a Sherline spindle motor ?
> >
> > Right. I meant to type in/lb. Stupid fingers! In any case it
shouldn't be
> > too hard to stall.
> > --
> > Phil Mattison
> >
> >
> > ----- Original Message -----
> > From: Dave Sage <davesage12@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Thursday, December 18, 2008 12:09 PM
> > Subject: [CAD_CAM_EDM_DRO] Re: Servo as a Sherline spindle motor ?
> >
> >
> > > Correct me if I'm wrong but:
> > > 16 oz in a pound, 12 inches in a foot
> > >
> > > 150 oz/inches equals:
> > > 150/16/12 = approx 0.8 ft/lbs.
> > >
> > > Sage
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Yahoo" <yahoo@> wrote:
> > > >
> > > > 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
> > > >
>