eKretz
Diamond; Mod Squad
- Joined
- Mar 27, 2005
- Location
- Northwest Indiana, USA
Here's a thought; get a 3-jaw chuck large enough to accept the largest bars to be drilled but not so heavy that it will be awkward. Machine a threaded adapter with a reamed 3/8" bore so the guys on the floor can use a 6" long 3/8" shank center drill. That can be your jig.
Won't get the centers inline, but will get the bar up in the machine. (What if the ends of the shaft are sawed out of square? What if the bar is not straight? What if the bar is a piece of hot rolled and isn't even round? Etc...)
The horizontal mill will get the centers straight and inline - so long as the operator sets it up correctly and the machine is in decent shape.