|| >> Any suggestions on cutting them out evenly so that they're neither || >> burred nor bent when I'm done? || >>
|| > That seems doable. Buy a stack of brass shims - sheets of brass. || >
|| > Then select a hole punch of 1/2" and 9/16. These are used on paper, || > plastic, leather and the like. The trick will be a firm enough backing || > that allows a punch and won't distort. || >
|| > You can make these - mount them in a drill press and press downward... || >
|| > Grind pipe or tubing and harden if possible - maybe using an additive. || >
|| > Or buy them from Cox for your engine :-) Martin || >
|| "Cox" no longer exists. Estes owned the brand but didn't do anything || with it but sell ever less well made and harder to find .049s. They || recently sold a whole warehouse full of stuff to a distributor, although || it's not clear whether they sold the Cox name to go with it. || || Besides, I'm making the cylinder, head, rod and piston as a training || exercise. So it may not have _exactly_ the same dimensions as the || original. (It may not run, either -- I just noticed tonight that I had a || pretty serious boo-boo in the port timing. I'm going to finish it off || and give it a whirl; I plan on cheering if the engine can turn under || it's own power. Then I start working on the next one with an eye to all || the lessons I've learned on this one). || || -- ||
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| | Here's one made of brass with the correct ID but larger OD. Each sheet is | .002" thick. | Just trim the OD as necessary for your needs. | |
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Or these :
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