Re: Angular Contact Bearings and Ballscrews question

Tom 32##,33##,52##53##and 54## are all double race angular contact
bearings. although I don't have access to the part number at the
moment, Bridgeport and clone's use this style of bearing. they
have different contact angles gererally the larger the angle the
better.
The floating end of the screw has the outer race of the ball bearing
in a loose fitting bore.
The ultimate ballscrew thrust bearing is of course a "ballscrew
thust bearing"pair. they have numbers like 30 TAC 62 (30mm ID 62mm
OD) or from the 7### series bearings. They come in double,triple or
quad sets or as universal singles "SU" .

--- In CAD_CAM_EDM_DRO@y..., "kaynrc" <tom.kay@n...> wrote:
> Hello
>
> I am starting to look for angular contact bearings to intsall in
one
> end of the leadscrews for a mill. I seem to recall that the screw
is
> firmly held at one end, while it can "float" in the other end,
> meaning that with expansion due to temperature, one end of the
> leadscrews sit in a radial bearing.
>
> So, are there such beasts as double angular contact bearings? Or
is
> it common practice to buy 2 for each screw, and mount them
backwards
> to take up thrust forces in both directions? If they are sold in
> double row, do they make them small enough for a .631 screw, with
a
> base diameter of about 0.500"?
>
> Would tapered roller bearings work just as well? Or are they too
long
> and bulky or something?
>
> If anyone has cnc'd a mill and run into this, could you inform how
> you handled the bearings?
>
> Thanks a bunch, Tom.