JT 2-1/2 Spindle Chuch replacement

That is actually quite similar to many of the sensitive drill presses to be found on eBay currently.

I agree that feel is an important consideration with such tiny drill bits.

Enjoy, DoN.

According to Norm Dresner :

O.K. That could be what they used -- though Lord only knows why they would mark that on the machine, when there is a Morse taper socket in the spindle to allow you to change arbors for whatever size your favorite drill chuck happens to take.

Enjoy, DoN.

replying to Norm Dresner, drillpress wrote: I also have a JT 2 1/2 Chuck on a Columbia 515 drill press made in Taiwan. I compared the taper dimensions with the published Jacobs taper dimensions and found that it was likely consistant with a current Jacobs 6 taper. I purchased a new Jacobs 6 chuck and it fit perfectly. I have no idea how that conversion can be explained.

replying to Norm Dresner, drillpress wrote: I also have a JT 2 1/2 Chuck on a Columbia 515 drill press made in Taiwan. I compared the taper dimensions with the published Jacobs taper dimensions and found that it was likely consistant with a current Jacobs 6 taper. I purchased a new Jacobs 6 chuck and it fit perfectly. I have no idea how that conversion can be explained.

replying to drillpress, Chitty wrote: Looking for info on a JT 2 1/2 taper drill chuck also. Mine is a similar Taiwan marketed in North America. The Jacobs 2 1/2 taper is its very own taper but used widely in the era on Japanese configuration but appears to be no longer available these days. The JT

replying to drillpress, Chitty wrote: Looking for info on a JT 2 1/2 taper drill chuck also. Mine is a similar Taiwan marketed in North America. The Jacobs 2 1/2 taper is its very own taper but used widely in the era on Japanese configuration but appears to be no longer available these days. The JT 6 is close but a different bird. Anyone have any luck? The spindle on my machine is a one piece unit with the lower end being a male JT 2 1/2 that is intended to mount the appropriate chuck directly to the spindle without the typical double ended arbor between the spindle and chuck. Only option I’ve found is to pull the spindle and hope a machinist can convert the spindle without error to a modern available taper. Share your info please!