Quote Originally Posted by Frank S View Post
Glad you got it it out. Now that that is over with get yourself another arbor of use a couple of MT 2 drills with some inspection die of your choice check them against the spindle taper. there was some reason it was jamed so tight. Possibly you may have over tightened the draw bolt . of what ever machining operation you did previously may have had a lot of vertical chatter which could act like a percussion hammer driving the arbor up into the spindle, no matter what the cause for peace of mind you should try hard to learn what it was so you can prevent it form happening again
Ditto. Frank S nailed it. Morse tapers are incredibly secure 'self-holding' variety of tapers. I can't justify why #1 through larger are not consistent in taper per foot. I suspect the formula was based on surface area, where larger sizes didn't need length to ensure engagement. But the threaded jack was best solution by far, threads generate leverage exactly like an inclined plane. The large members of machinery leveling pads prove it. And lathe tailstocks...