Re: Stainless tubing

Hi Smoke,

I thought of that, but the thought of spending
an hour drilling a 2 ft lenght just was too much.

Since the bore is not critical the long hole would
not be a problem.

but, I need to locate one bearing in the center, and one on one end,
with a 10 inch projection. That means turing almost a foot of the OD.

Since I'm just a little busy or lazy (depending on whom you talk to)
I'd probably send it out to get center ground for a perfect finish.

Dave

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <smoke@t...> wrote:
> 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