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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JR North
 
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Default How to accuratly plot bolt circle radius?

In reverse engineering my radar scanner for mods, I am in the process of
machining an adapter, and I have run into a conundrum.
I need to very accurately plot a bolt circle radius consisting of 4
evenly spaced 3mm screws, about 1/2" radius. The screws rock slightly in
the threads, so I can't just mike the screw shafts and extrapolate.There
is an open center, so I can't easily locate x0y0. The hole centers must
be plotted very accurately for alignment of the vaveguide. Help?
JR
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