MasterCraft 8 inch drill press (Model 55-5915-4). Problem: the whole chuck unit is attached to a post that spins and in turn spins the chuck. While trying to drill into a piece of stone the whole chuck...
Most drill press chucks are attached via a tapered post on the back end of the chuck. This is a short post about 3/4 inch in diameter and 3/4 inch tall. This short tapered post (the taper is very slight) fits into a tapered hole. That hole is often in the end of a second a tapered shaft (usually call a taper, R8 is a common designation). That shaft is about 6 or 8 inches long and fits into another hole, much deeper of course. It is this longer taper that is meant to be disassembled routinely for inserting different tools. The short one is not meant to be routinely separated. I'm not sure which of these is giving you trouble, but in either case the key thing is that the mating surfaces be clean. The means of attachment is simply by pressing them together. If it is the short post that has come apart, clean both surfaces carefully with a clean rag - you don't want any dust or dirt at all. Open the jaws of the drill chuck all of the way so that the three jaws are retracted inside the chuck. Place the chuck on the table with table raised up enough that you can pull the drill press handle down slowly but forcefully to fully seat this taper.
On the other hand, if it is the long taper that has come apart, this taper is not so slight and it meant to be jammed together by hand. Make sure the mating surfaces are clean, align the tang (that's the top end of the taper that looks like a giant screwdriver blade) is aligned with where it will fit all of the way in, then just give it a quick jam into place by lifting it into place quite briskly.
By the way, while clean these tapered surfaces look carefully for any nicks or bumps- you will have to remove these with a small file. It's ok to have a small flat spot on the tapered post or shaft, just keep it very small.
I hope you found this helpful.
Aug 04, 2011 |