RE: [CAD_CAM_EDM_DRO] Musings on screw pitches

> >
> > Well it went 6 times faster.
> http://www.caswa.com/nobott_on_speed.wmv
> > (cutting the road runner)
> > Not only that, it accelerated 6 times faster. Same drives, same
> > motors.
> >
> > The acceleration is the clincher. It's clear that, on
> machines of this
> > size, that the mechanical advantage of the ballscrew
> reduces the mass
> > that the motor "sees" to a point well bellow the inertia of
> the motor+
> > screw.
>
> Where did he get the ballscrews with that pitch?

Ebay, unable to cope emotionally with having the slowest router in town. I
immediately went looking for some 20mm pitch screws (yes I drive a big car
too). Found 'em pretty quick.

>
> My XY system for programming a panel of processors ended up
> being so slow with a 20TPI thread that it was faster to do it
> by hand. My next approach was going to be to use belts. But
> 20mm ball screws sounds like a good idea.

Yeah, this is the sort of thing I'm talking about, using a coarser pitch
screw to improve speed with steppers just doesn't seem to be a strategy
that's in the public domain... Seems strange that..

PK

> >
> > 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
>
>
>
>
>
>
>