Agreed I thought it was odd that he mentioned having to grind the tangs off tools for a SB lathe.
More accurately, one could say, there is no anti rotation feature or tang specific socket built into the tailstock, at least what I see. At the expense of tailstock travel, one can insert a MT3 taper with a tang.
True. My lathes have not had that feature. Several years back, I got into a rather heated discussion on another HM thread as to the purpose of the tang on a Morse taper. The contention was that the purpose of the tang was to eject the taper by means of a wedge driven through a slot in the spindle. My contention was that if the tang was not intended as an anti-rotation device, there wouldn't be a need for the key shaped feature. It would be cheaper to make both the taper and the socket without the keying feature. The opposing argument was that a properly seated Morse taper is locking of its own accord and therefore a tang locking feature would be redundant. Unfortunately, I wasn't able to find any supporting documentation either way so the question remains open. The taper was invented c.a. 1860 and there is no easy way search for a specific patent by descriptoion, inventor, etc. You literally have to go through the patents, one by one to find the one you're looking for.
