Re: [CAD_CAM_EDM_DRO] Bridgeport Series 1 Spindle Ball Screw

fuddham@... wrote:

> I posted earlier about need a new ball screw and nut for the
> spindle on a Series 1 CNC mill. I was given a contact, but he did
> not reply to my e-mail. I took the head off and took the nut off.
> The ball bearings had somehow gotten past the return pipes and went
> on up the nut and screw. There is also a hole in side of the nut
> where a screw goes that holds a clamp to hold one of the return tubes
> to the outside of the nut. Since there are two return tubes and only
> one of the hold-down screws shows on the inside of the nut, I assume
> that this was a defective nut from the start.
> Does Bridgeport still have parts for the Series 1 CNC? Wher can
> I turn for a replacement or help?

It sounds like maybe someone with one of these BOSS J heads should
make a picture of theirs for you. I suspect that it is NOT a defective
nut, but that the clamp has been damaged, there was something else that
holds the 2nd return tube in place that is now missing, or something like
that. Maybe the 2nd tube is permanently fastened, and the 1st is made
servicable.

I don't think you want to learn the price of a new nut/screw assembly.
I suspect you can't get the nut alone, you'd have to get the nut and
screw complete. Is the 'screw' actually ground into the quill, or is it
a separate piece attached to the top of the quill? If it is actually ground
into the quill, then the whole head would have to be replaced, as the quills
are individually fitted to the head main casting. Now, you're talking REAL
money, surely more than you paid for the whole machine!

Anyone ever get into one of these that can help Scott out?

Jon