On Fri, 20 Sep 2013 16:05:26 -0500, Lloyd E. Sponenburgh wrote:

Tim Wescott fired this volley in
:

Threading such thin wall tubing makes me think that it'll just break.


Me... I'd just rough up the od of the plug (maybe even lightly knurl it)
and rough the id of the tube, then PRESS them together with an
interference fit (and maybe some permanent LocTite to fill the surface
imperfections and help with the strength). If that wasn't strong enough
for my tastes, I'd either peen or pin each plug in a couple of places.

I think at the rpms of an 0.049, you're talking about a chancy part.
Any radial misalignment or imbalance is going to shake things fiercely.

LLoyd

Well, I was thinking one of the old 15,000 RPM ones, not the new 35,000
RPM ones.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com