Re: [CAD_CAM_EDM_DRO] Re: Servo as a Sherline spindle motor ?

it is 150 oz * in not 150 oz / in



And your math is correct, 150 oz - in is about 0.8 lbs - ft



Nigel

----- Original Message -----
From: "Dave Sage" <davesage12@...>
To: "CAD CAM EDM DRO" <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 18, 2008 11:09:15 AM GMT -08:00 US/Canada Pacific
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
> >
> >
> >
> > ------------------------------------
> >
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