MT 4.5

matthewsx

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Does anybody sell a dead center or adapter for my MT 4.5 spindle?

If not, how would one go about making one? Can you cut it with the compound? How about turning on centers (oh wait, I need a center for that).......

Thanks,

John
 

Ulma Doctor

Infinitely Curious
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You could hold a piece of stock in a 3j chuck and turn a 60* center , then install a dead or live center into the tailstock.
Offset the tailstock for .624” taper per foot and punch one out!

grizzly used to sell adapters if I’m not mistaken
 

extropic

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Nov 24, 2014
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Does anybody sell a dead center or adapter for my MT 4.5 spindle?

If not, how would one go about making one? Can you cut it with the compound? How about turning on centers (oh wait, I need a center for that).......

Thanks,

John

If MT3, call Grizzly, parts. I think I bought one from them a few years ago.

If 5C, JFK Precision Products can fix you up.

Other ???
 

Asm109

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Aug 29, 2017
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409
If you really want to roll your own....
Mount a dial indicator with a rocker lever to the compound.
Set it dead center on the spindle bore height wise.
Adjust the compound until you get zero movement as you go in and out of the spindle bore with compound. Indicate on the rear side of the bore.

Mount up a chunk of material in a 3 jaw, and turn the od with the compound.
Remove chuck, push your new part into the spindle and turn a 60 degree point on it.
DONE.
 

erikmannie

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I think @erikmannie made a bunch of those.

I made four MT #6.5 dead centers for my PM-1660TL.

It was not a difficult project. I chucked up some 3” round stock (1018, 1045, and then 4130PH) in a chuck & turned the taper. At that point, the tailstock was supporting the end of the workpiece with a live center.

After I got the taper to where I wanted it, I used the compound to cut a 60° taper for the tip. That was a lot of cutting!

Part it off & you’re done.

I was surprised how forgiving the spindle nose was for variations in my work. I was sure that I had cut too steep of a taper on the first one, but it held just fine in the spindle nose. After making four dead centers, I really nailed the angle on the last one, and it seemed to work no better or worse than the first dead center that I thought I had butchered.

As everybody knows, a Morse taper dead center is held really tightly in the spindle nose after working with it. I put a dowel through the pass through hole, and knock out the dead center by tapping the dowel with a BFH. One time, the dead center got past my right hand and fell on the ways, which was awesome. I had a foam pad down there, but apparently the foam pad wasn’t big enough.
 
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erikmannie

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You should make a knock out bar instead of the dowel, a long piece of about 1" dia. bar, knurled on one end and radiused or chamfered and a hunk of brass on the other end the hit the center.

Is that because it can be a bad idea to get little pieces of wood in the spindle, chuck or ways?
 

benmychree

John York
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It is just more convenient to use, no hammer required, note that toolroom lathes such as the Monarch EE and the Pratt & Whitney come equipped with them and hooks to hold them on the machine.
 
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