I finally finished up a jig to hold rotor housings on my milling machine so I can do PP housings. Machined a junk 12a housing tonight just to test it all out. Came out rather well, although more time consuming than I expected. These housings are pretty tough for aluminum.



https://www.nopistons.com/forums/gal..._239_16689.jpg



https://www.nopistons.com/forums/gal..._239_53170.jpg

https://www.nopistons.com/forums/gal..._239_50642.jpg

https://www.nopistons.com/forums/gal..._239_50512.jpg

we're working on a sleeve that just drops into a hole like that....

[quote name='mazdaspeed7' date='08 May 2010 - 05:13 PM' timestamp='1273291985' post='933016']

I finally finished up a jig to hold rotor housings on my milling machine so I can do PP housings. Machined a junk 12a housing tonight just to test it all out. Came out rather well, although more time consuming than I expected.

[quote]





did you make that jig so big to stop chatter

Yes, but not only that. Jigs need to be strong, even moreso when they will be used a lot, like production work. It also needs to be strong so it doesnt lose tolerances as its used. Milling machines can put significant side loads on parts being machined, and I need this jig to be as rigid as possible to get a smooth, clean, and repeatable cut in the housings, and to continue to have those qualities for as long as I use it.



FYI, the jig was CNC cut via waterjet, assembled and welded together. The jig alone weighs 40-50 lbs.

Nice fixture. I also really like the shape of your port. Round ports are easier but in my opinion not the optimal design.