Alex Cam
02-13-2008, 5:36 PM
I have an older drill press made by a company called "Cummins-Mack" in Chicago. It's a floor-standing model, 3/4 horse motor, real nice considering the $45 I paid for it at a garage sale.
The problem I have is that there seems to be something wrong with the chuck -- I only just noticed it when drilling out some pen blanks on it for the first time. When I bought it I measured the runout on the spindle at 0.001, and the chuck at 0.002. Unfortuntely, it seems that there's something wrong with the jaws on the chuck. When I put a bit in the runout near the top of the bit is more like 0.01.
If I'm reading the chuck correctly it's a JT3, which I think means it's nothing more than a tapered friction fit. I can't get it off for the life of me. Any suggestions? Am I missing something?
Alex
The problem I have is that there seems to be something wrong with the chuck -- I only just noticed it when drilling out some pen blanks on it for the first time. When I bought it I measured the runout on the spindle at 0.001, and the chuck at 0.002. Unfortuntely, it seems that there's something wrong with the jaws on the chuck. When I put a bit in the runout near the top of the bit is more like 0.01.
If I'm reading the chuck correctly it's a JT3, which I think means it's nothing more than a tapered friction fit. I can't get it off for the life of me. Any suggestions? Am I missing something?
Alex