Re: ball screws Backlash

Am very familiar with the antibacklash double ball nuts. I have them on my
full size mill. The regular rolled cut ball screws can get down to about
.002 and save about $20 per axis if that is acceptable. Otherwise the
additional expense is sure worth it.
Dan
-----Original Message-----
From: TADGUNINC@... <TADGUNINC@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Tuesday, June 15, 1999 7:07 AM
Subject: Re: [CAD_CAM_EDM_DRO] ball screws Backlash

>From: TADGUNINC@...
>
>Dan,
> I'm not sure how to reply without getting a bunch of the old mail

included

>sorry.
>But about your lead screws, how do I contact Thompson? As far as the
>backlash error, if you preload two ballscrews against each other couldn't

you

>effectively eliminate the backlash? I know the more expensive mills used
>backlash eliminators (see page 97 of "Machine Shop Practice" Vol. 2, if I
>ever get a scanner I'll send PICS instead of references) with two nuts and
>adj. preload on the nuts with acme lead screws. It not only nearly

eliminated

>backlash but also prevented damage to the cutters servos, etc., when climb
>milling with heavy feeds. This was the approach I was going to take with my
>mill, however the ball screw setup seems to be a better way to go to cut

down

>on the drag and size of the servos required.
> Tracey DeChambeau
>
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