Re: Re: Looking for short ballscrew

>Yes, I think you are right. The Bridgeport J head weighs

over

>200 Lbs (including motor).
>(Snip)
>You would needsome VERY large linear rail assemblies to

match that kind of stiffness.

>The farther out it is cantilevered, the worse the situation

gets, too.

If anyone is seriously considering building one of these, I
have some 19" long 25mm linear rail with some MASSIVE
bearing blocks. These blocks are preloaded, do not use
piddley little round recirculating ball bearings, they use
recirculating needle bearings. I believe that the dynamic
load carrying capacity for these units is something like
7500lbs per bearing.

I also have RFE 7/8 dia NSK ballscrew with single preloaded
nut which is probably more than adequate for the task.

If anyone is seriously interested, please contact me off
list.

Bill Griffin
bill@...
www.grifftek.com/links.htm