I am currently e-mailing foundrys trying to find someone
casting 398 alloy. Currently waiting for a responce from Leitelt
Brothers INC  (info@LBfoundry.com <mailto:info@LBfoundry.com) located
in Chicago.  My gantry router is running and I pick up some 1" MDF
tomorrow to cut patterns for the side housings. Apparently 1.3% oversize
patterns are required for aluminum alloys or if your are using a
pattern makers scale it is 7/32" per foot oversize. If you happen on a
foundry using either 390 or 398 let me know on the yahoo e-mail since it
seems a little off topic for the rotary engine newsletter.

george grimes


Ok george I did send a revised dwg to jeff to see if he can machined the parts
you said you can make the pattern if let know

Jean



Spotted this checklist for prototype casting. Lots of good details, so worth reading.

http://www.alumacast.com/casting_tips/

Just curious as to why you picked 390 or 398 as your alloy?

Tom Walter