Bryan Fear & Leora Alden wrote:

Has anyone tried to set the housing up in a drill press and just 
drill the roll pin out?  It should be possible with some
grinding to make a drill of exactly the right size to fit the 
hole  if,  in fact,  the hole is not a standard size  Even if you
leave some of the pin behind with the drill it should be much 
more likely to shear off rather than tear the housing apart.
Bryan in Princeton. B.C.

Usually they are hard to drill because they are made from 
hardened high strength steel.

The expensive way is to send them out and have an EDM machine
remove them. EDM is Electric Discharge Machining.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.