Barry Gardner wrote:

Paul,

Here's a question to pass to Butch, the maker of the last batch of Wiggins
couplings.

I'm working on making a few of these in the machine shop of my local
community college. My question is whether Butch made them on an engine lathe
and, if so, how he held them? Did he have an expanding mandrel on centers
that gripped the aluminum tubing from the inside as he machined the outside?
Or did he make some other kind of home-brew contraption to grip them (and
hopefully would be willing to sketch for the benefit of those of us lacking
his experience and imagination)?

Armed with your blueprint, Paul, a bunch of us in my shop class were
puzzling over the best type of fixture to do this.

Barry Gardner
Wheaton, IL

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