Because the tang on the MT chuck adapter is contacting the feed screw in the tailstock. You could remove the tang, but be careful about how much you cut off because this is how you remove the adapter from the tailstock. I have mine modified to contact the feed screw at about 1/4 inch from full retract.
My preference is a Jacobs chuck and adapter, there are also some good import chucks available but I have no experience with them.
There is no tang on this chuck, Jim. Just a MT that mates to the MT taper in the tailstock. I guess one could shorten the male MT on the spindle to achieve a little more tailstock retraction though I've never really thought about it since I'm yet to run into a situation where it's been an issue.
That's what I did, I shortened my drill chuck arbor so that it ejects just before the ram is fully retracted, ejects just before 0 so I get thefull stroke for drilling. I only did this with my drill chuck as the other accessories ddon't matter.
Not that it matters but I use a 5/8" Bison keyless chuck most of the time & I also have a Jacobs 14N BB chuck on the lathe. I never even used the chucks that came with my lathe & mill. I prefer to use a good quality chuck.
That's what I did, I shortened my drill chuck arbor so that it ejects just before the ram is fully retracted, ejects just before 0 so I get thefull stroke for drilling. I only did this with my drill chuck as the other accessories ddon't matter.
Not that it matters but I use a 5/8" Bison keyless chuck most of the time & I also have a Jacobs 14N BB chuck on the lathe. I never even used the chucks that came with my lathe & mill. I prefer to use a good quality chuck.