Re: [CAD_CAM_EDM_DRO] Small, hollow, thick-walled tubing needed

See:
http://www.accutube.com/.150over.html
a wall really thick enough to thread may be more difficult. -- The ultra
high pressure people may have some - but I never worked with any of this less
than 1/4" . I would suggest a smaller od with a threaded sleeve
silver brazed on each end. Too small id and surface tension and viscosity
effects may not let oil drain with only gravity.
Jesse.


Smoke wrote:

> Oooh...that's going to be hard to find!
>
> I haven't looked in the catalog but you might be able to buy some extra long
> drill bits that have coolant passages down the center. Just cut off the
> drill portion and machine to fit. The drills are made of pretty good steel
> and would be ideal for the purpose if you can find suitable ones. They'd
> be a little expensive for the job though.
>
> Another solution would be to forge your own. Build a spilt die, use larger
> size tubing, run a hard wire down the center after heating and squish the
> die around the wire. QUICKLY!
>
> Smoke
>
> > I need 3/16ths od with a thick enough wall to do an external thread
> > at each end, yet hollow enough to allow oil to drip through. These
> > are to be used on my little Merlin engine project, and I'll need 28
> > pieces about 3.5 inches long, 3/16 od, with some sort of oil passage.
> > The hole is to allow oil from the camshaft area to drip back down
> > into the crankcase. Yet these are actually hold-down studs for the
> > cylinder block (including cyl. head) so they have to be strong enough
> > to be torqued. The engine is 1/4 scale.
> >
> > Any thoughts on where I might easily buy such tubing? I have checked
> > the hobby shops, and it's a good start, but the hole is a tad big for
> > me, so the walls are not quite as thick as I'd like.
> >
> > Thanks in advance. Tom Kay.
> >
>
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