In this specific case I need to drill a line of four, 3/8" holes in 1" thick steel. The operations I am doing are: 1)spot drill 2)pilot hole - about 1/8" 3) drill full hole size 4) chamfer. I have to do this on four pieces of steel.
I first thought it was better to do all the spot drilling, then the pilots, etc. so I would only have four tool changes. Without a DRO, however, I have to get on center with every operation and it seems like it would be more efficient to keep the center on each hole, and do all the tool changes and operations for the hole, and then move to the next one.
The location of the holes does not have to be very accurate but the chamfer in particular has to be on center.
Sorry this is so basic - I have not found an answer in the books I have and I am sure the answer lies in experience. I have thought of some kind of jig but I am not sure how to make it, and in the end it is only four pieces and sixteen holes.
