Re: Ballscrew Slop Question

--- In CAD_CAM_EDM_DRO@y..., Joe Vicars <jvicars@c...> wrote:

> 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.

> Hi Joe, Thanks, How do I set the preload??? I didn't change

anything when I installed the ballscrews, just slipped them in the
endcap.. Thanks again; John

> jh1221@a... 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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