Re: [CAD_CAM_EDM_DRO] Stainless tubing

I'd do it on a lathe.
First I'd mount the part between centers and turn a short section on each
end.
Then I'd mount the part in a four jaw chuck, supporting the other end on the
tailstock center (with the steady rest installed but not touching the part)
and adjust the chuck to center the part =/- .001. Then I'd set up the
steady rest and drill the thru hole to a size just below the final diameter.
After that I'd bore one end, turn the part around, re-center and bore the
other end. This should give you a pretty accurate part. If there is a
shaft that supposed to fit the bores, you can always relieve the center area
to reduce friction (or install bearings).

I used this technique to build a bolt action rifle receiver. It works good.

BTW....in case (I forget who) wants to know...yeah, there's no such word as
"thru" either but it's been used in engineering for many many
years...irregardless! :-)

Smoke

> I've been trying to find stainless tubing with
> a heavy wall, 0.75" OD , 0.1" wall or more, but have had no luck.
>
> I only need an 18 inch long piece, but am wary of
> trying to drill that length.
>
> I need to use this in a couple of pillow block bearings so OD
> dimmention is important.
>
> McMaster sells ground hollow shafting , but they start at 1.5 inches
> OD.
>
> can anyone point me in the proper dirrection ?

> Dave