[modeleng] Question (maybe stupid)




How do you produce a D shaped hole? Say 3/8 inch diameter, with a flat
about 1/8 of a diameter? (in 16 gauge aluminium)

first thoughts are punching with a punch made from silver steel and
hardened. What about a die? I presume that when such dies are made by
toolmakers, they first produce a broach and pull it through the die
material, which is subsequently hardened.

Anyone suggesting a file and a smaller hole will get a raspberry blown at
them. I know that some say the only tools needed are a hammer, cold chisel
and some files, together with skill, but that last bit is lacking, and I'm
too old to get good enough in my lifetime!

Peter Chadwick
Swindon

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