Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?

----- Original Message -----
From: Les Watts <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 05, 2002 10:41 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?


> Seth,
> you are right in that rotating nuts require a good bit of expensive
> engineering
> and machining work. Rotating nuts generally have to be rated for that
> use.... it usually means some degree of dynamic balancing and attention
> to grease flow with the acceleration forces.
>
> But they sure can be high performance!
>
> For the conventional approach just use a larger diameter higher lead
> screw. A 0.625 screw 60 inches long is getting kinda dicy with awfully
> low critical speed and buckling load. I read 350 lb max load and
> 220 ipm critical speed fixed fixed.
>
> A 1" screw with 0.5" lead gives 3000 lb buckling load and 975 ipm
> critical speed fixed fixed. It is still pretty respectable fixed simple.
>
> This data is from Nook tables.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
> Surplus cnc for sale:
> http://www.alltel.net/~leswatts/forsale.html
> ----- Original Message -----
> From: "dgmachinist" <scsm@...>
>
>
> 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@...
> Moderator: jmelson@... timg@... [Moderator]
> 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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>