Re: [CAD_CAM_EDM_DRO] Ballscrew Slop Question

It looks like the bridgeport uses two angular contact bearings, so you either have badly worn bearings or you don't have the preload
set correctly. There may be some binding or misalignment that is making the nut feel tight when it's not. I would start there
since it is unlikely that your leadscrew bearings are bad.

Also, the angular contact bearings have to be facing each other the right way or they will not get tight. They are usually sold in
pairs and should have some marking indicating which side should face which.

If you do have to buy new bearings, for goodness sakes don't call any machinery dealer!! Just pull them out and match the numbers
from MSC or your local bearing shop.

jh1221@... wrote:

> Hello All, I just installed ballscrews on my Bridgeport mill, in
> preparation for a CNC conversion. They were purchased from Hi-Win
> Industries. After installation, I noticed that there is about .002-
> .003 slop in either direction on the X axis. (the Y seems OK) I have
> been told that my bearings that are in the left side end cap might be
> at fault. Could this be true? Since the original Bridgeport didn't
> need to have zero backlash, are they even thrust bearings at all? If
> I need them, does anyone know of a cheap source?, the ones I checked
> for the bridgeport(20mm id x 47mm od )are $270.00 for two!!! Or does
> anyone know of a different solution? Thanks in advance; John
>
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