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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Square holes in a round bar.
How would one make nice sharp-cornered, clean-sided (I'm not sure of the
surface finish, but mirror-bright would be nice) square holes, about 0.1" on the sides, off center from the axis of the bar (so not square to the bar surface), in a round steel bar about 0.75" in diameter? Alternately, how might one make those same holes in a cylinder machined out of that same bar, with a wall thickness of about 0.06", without distorting the cylinder by more than a couple of thousandths (I am assuming that one would have to do some post-operations to clean up the cylinder after making the holes, unless one hand-filed them). This is a thought experiment for making cylinder liners for 2-stroke engines of about 0.2 in^3 displacement; the holes would be the transfer ports, and the cylinder liners need to have their diameter controlled to about 0.001" on the outside and less than that on the inside for proper sealing (or if not controlled, then at least matched to the crankcase that they slide into, and the piston that slides in them). -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
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