Re: [CAD_CAM_EDM_DRO] Re: Newbie question: Motor sizing

Mariss,
Thanks for the explanation! You got me beat by about 10 years for the
college experience, mine was nearly 40 years ago!

I appreciate the explanation and now, I can go back to the spread sheet and
plug in some numbers to see how it works out!

At 10:30 PM 6/1/02 +0000, you wrote:

>Art,
>
>Keep in mind the things I am out of my depth about. I am a EE and I
>have no machining experience except for running a manual Bridgeport
>when I was in college a couple of summers 30 years ago.
>
>What I am going on is the manual X/Y axis feed handles were about 5"
>in diameter, so the moment arm was 2.5". I kind of remember being
>yelled at if I applied more than 5 to 10 lbs of force on the handle.
>That took using a fist and I was told not to.
>
>5 lbs is 80 oz, over a 2.5" moment arm it becomes 200 in-oz, on a 5
>TPI leascrew it becomes 2pi*200 in-oz*5TPI/16*.75 eff = 294 lbs. 10
>lbs of tangential force on the handle would be 589 lbs. I picked a
>number in between, 500 lbs.
>
>Mariss
>
>--- In CAD_CAM_EDM_DRO@y..., Art Eckstein <axtein@d...> wrote:
> > Mariss,
> > Ok, I understand all that you have said EXCEPT one of
>the "assumptions"
> >
> > In the example, you use 500 lbs of "push". Is this a realistic
>number or
> > how did you arrive at this figure??
> >
> > I ask, as I am trying to see if some servo motor I have will work
>using
> > your formulas. Any help will be appreciated.
> >
> > <snip>
> >
> >
> >
> > >(5) Let's go thru an example of the above using what you have (and
> > >many guesses on my part).
> > >
> > >Assume the following:
> > >
> > >TPI = 5 turns per inch
> > >Lbs = 500 lbs of push needed
> > >IPM = 60 inches per minute max for your "work" speed
> > >eff = 75% (0.75) for your leadscrew.
> > ><snip>
> >
> >
> >
> > >Hope that helps, hope I did the math right.
> >
> >
> > AND YES, it helps:-})
> >
> >
> > >Mariss
> > >
> > >
> >
> > Bubba
> >
> > OLDER THAN DIRT
> > Country Bubba
> > (Actually the inventor of Country and Bubba)
> >
> > axtein@d...
> > LaGrange, GA
> >
> > http://members.dicomm.net/~axtein
> >
> >
> > [Non-text portions of this message have been removed]
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
>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 as 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.
>
>
>
>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@...
>Moderator: jmelson@... timg@... [Moderator]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>bill,
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Bubba

OLDER THAN DIRT
Country Bubba
(Actually the inventor of Country and Bubba)

axtein@...
LaGrange, GA

http://members.dicomm.net/~axtein


[Non-text portions of this message have been removed]