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
> > >
> > >
> > >
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
> Yahoo! Groups Links
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