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
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Addresses:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> > >
> > > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
> > timg@...
> > > Moderator: pentam@... indigo_red@... davemucha@...
> > [Moderators]
> > > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> > >
> > > 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
> > >
> > >
> > >
> >
>
>
>
> ------------------------------------
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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
>
>
>


------------------------------------

Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

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



This communication including any attachments, are intended
for the exclusive use of the addressee(s) and contains
confidential or copyrighted materials. Duplication,
distribution or reproduction is strictly prohibited by law
without written permission of Verrex