Re: Need ballscrew support Bearings.

It is a BOSS machine.
I need 2 pairs of bearings the sizes listed, mounted back to back
for each axis. The "undriven" end of each ballscrew just floats.
I am comitted to these sizes unless I do some machining. (Not!!)
The matched pairs have a 60 degree contact angle
so they can take a much larger axial load than a lesser contact angular
contact bearing. They are back to back and preloaded to eliminate
end-play due to the bearings. I just don't want to spend $$$ for
a pair of these if there is really no gain that will be noticable.

Thanks,
Scott

--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@...> wrote:
>
> Scott,
>
> Just a single DRAC bearing per axis is sufficient. On the X, only
the driven side needs one. The other end of the screw just floats in a
standard bearing. The bearings are a bit pricy, about 40 a piece.
Standard endplate bearings being referenced.
>
> Ron
>
> Where is there a bearing thats 3.15" OD X 1.968" ID at on a
Bridgeport series 1? Or is this a cutom set up? Or is this a Boss machine?
>
> Polaraligned <polaraligned@...> wrote:
> For a BP series 1 CNC machine.
> I need new ballscrew support bearings for both the X and Y axis. Big
> question is if a matched set of the special "ballscrew support"
> bearings are worth the extra money? (probably $400 per pair)
>
> Will I really be able to notice a difference in performance if I just
> use 2 "unmatched" angular contact bearings? Will they wear prematurely?
>
> This is just a hobbiest machine and will not see heavy usage.
> The bearings I need are:
>
> Y- 52mm od, 25mm id, 15mm wide
>
> Thanks for any help.
> Scott
>
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