Hi tt350, a lot depends on how deep you want to go, what material and most important the volume required.
If you only want a few hundred, with a depth of say 3/4" in brass, for a hex key drive in a plug with a blind bore, then have a punch made from toolsteel and put the part in a "nest" in a press and just push the punch into the hole with the press.
I made this set-up with a mill and dividing head, to put the key drive hex cavities in some plugs for picnic cooler boxes.
Took me about 2 or 3 hours all up to make the tool and nest, and cost next to nix.
I've got a few spares left over if you want to see a photo of the end result, and the tool as well.
Ian. |