RE: [CAD_CAM_EDM_DRO] Bridgeport mill ballscrew conversion

Sure they are. That is per foot and its a tolerance not a guarantee to be out that much. I need to get out some ground standards and check these that I have. I'm thinking there isn't going to be much of an error. If they touted .001" error tolerance per foot, nobody would buy the ground screws that they sell also. Alot of companies market things that way. Even if they are out that much over a foot. Divide that by 12 and thats how much they'll be out in an inch, if the accumaltive error is consistent throughout 12". .00025" error in an inch is more than any Bridgeport could hope to hold anyway with cutter deflection etc. They are good screws for a Bridgeport.

Ron

"George Taylor, IV" <gtaylor@...> wrote:

>Ron,

>I was looking at the Rockford conversion. Their spec is
>.003 for the (rolled?) screws. Is this acceptable for
>precision work like linear interpolation and thread milling?

>George

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of R Rogers
Sent: Sunday, April 17, 2005 6:32 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Bridgeport mill ballscrew conversion


Yes, Rockford ballscrew kit. Takes about two hours to swap out and they
are a very nice ballscrew assembly. About $650. Has everything one needs
for the upgrade.
Ron

john_glynn57 wrote:


Has anyone upgraded an old Bridgeport milling machine with a leadscrew
to a ballscrew drive and if so what strategy did you use.





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