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Old 08-09-2019, 08:50 AM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
Grumpy Bastard
Join Date: Jun 2004
Location: Kankakee County, IL
Posts: 20,392
Default MT3 issue with short or no tangs on live center.

Originally Posted by Shade Tree Welder
In reference to my Lathe tail stock that has a MT3

So my drills and drill chuck arbors all have a tang that
extends to the slot in the tail stock spindle. So you can
use the correct drift and loosen the drill or chuck and
remove it. However neither of my live centers have a
tank and do not extend to slot they stop just short.

What is the correct method of removing them?

That type of short shank tapers are always a problem. I don't know why they make them that way.

Some have a female thread on the end--they're pretty easy to deal with. Just thread in a stud or setscrew that sticks out a bit and you're good to go.

I have seen guys grind the slot on the tailstock--or whatever machine you're dealing with. A little time with a die grinder is usually all it takes to open the slot up enough that your drift key will work--you only have to move the taper a few thou to break it loose.

You can also take a drift key and grind it like I've shown in the attached drawing. Grind a small bump on the end at the point just before the key is tight in the slot. A little relief beside the bump allows you to place the key in the slot and give it a good sharp rap with a hammer. The key pivots against the slot in the tailstock and bingo, the taper pops out...

Hmmm......just found out I can't attach a picture to a PM. If you want you can send me your email address and I'll send you the sketch I drew up. Or I can post the whole message in the machining section. Your call...
I am glad I was not me being just stupid.

"Prepare to defend yourselves."
-- Sergeant Major Basil L. Plumley, Ia Drang Valley
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