gtslabs wrote:
I am making an attachment to my knee mill height hand crank. I drilled
a hole in a rod to match the diameter of the crank shaft. However there
is a keyway that I need to mill out of my adaptor on the INSIDE
Diameter. I dont see a Woodruff cutter working in this 5/8" hole.
I can mill it but it will not have square corners. What is needed to
get the square slot?
Thanks
Steve

I'm assuming it's a thru hole and key thru.

plunge out with endmill or plug and drill.

mount in vice, file the corners.

sjm1