In article ,
Wes wrote:

It worked out better than I thought it would but now I pose the question.
Back in the day
when they actually cut a key seat this way, what did the chisel look like at
the pointy
end? Like the typical cold chisel or more like a wood chisel? Hell,
anything informative
on the subject of machining with a hammer and chisel would be interesting.

For keyways, look up cape chisel.

Here's one site (scroll down past the woodworking chisels)

http://www.using-tools.com/chisels.htm

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