Stephen,
you asked a good question and I was remiss in not giving more detail. However, I just came in from removing the 5/8 Jacobs Chuck from the
15 1/2 drill press. The size bits it wasn't biting into were standard 1/4" bits. The half inch up was OK but not perfect.
I appreciate your response.
DavidF,
You rock! Thank you. It took several taps but it finally did come off. BTW, from what I've read, these arbors are fitted with either MT or threaded. Mine was both. After the tapping and the outer cover fell off I couldn't seem to budge the piece attached to the arbor. I Finally twisted it and sure enough it unscrewed. Now all I have to do is take it apart, realign the teeth (?) and hope I don't have to replace it at the tune of 93.00!