jremovespamblockroncallo wrote:
Does anyone know how to machine polyurithane. I have to bore a tapered
hole in the subframe mounts for my car, (custom application). Using a
boring bar the material just flexes around the bar.

Any Ideas.
John Roncallo

Gentelmen

Thank you for all the help. From most of the posts here it kind of
pointed me in the right direction. Get some tool with a high rake in
there. I made a tool out of a piece of 1/2" tubing. I ground down 90 %
of the cross section from one side and sharpend it to effectively make a
boaring bar with a very high rake angle. I did forget to mension that
the bore was not required to be precise, so eyeball round was fine.

I also liked the idea of frezzing but anything below houshold frezer
temperature was unavailable (Except for the last 5 LB of Freon 12 I have)

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