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Rotary table...with a thread on chuck?

Rauce said:
What’s there is a plain bore that runs true to the rotation of the table (less than .001” TIR).
Click to expand...

It seems odd to me to have a Morse Taper sleeve installed in a plain cylindrical bore. The whole purpose of an MT is to create a precision centered adapter with enough friction to stop the engaged part from turning. It makes no sense to turn around and put the MT sleeve in a cylinder fit that can't stop the MT from turning.

Is there a keyway or some sort of rotational stop to serve that function in there? Or am I totally missing something fundamental?
 
Susquatch said:
It seems odd to me to have a Morse Taper sleeve installed in a plain cylindrical bore. The whole purpose of an MT is to create a precision centered adapter with enough friction to stop the engaged part from turning. It makes no sense to turn around and put the MT sleeve in a cylinder fit that can't stop the MT from turning.

Is there a keyway or some sort of rotational stop to serve that function in there? Or am I totally missing something fundamental?
Click to expand...

No it doesn’t have anything to stop it rotating. I would guess the sleeve is a press fit and I don’t think the intended purpose would need to resist much rotational force. It’s only a stub sleeve so there’s not much taper contact anyways.

I believe it’s there to put a dead Center in for rotating/indexing something between centers. I can’t imagine it being much use for a locating feature on the back of fixture plate or something since you would need the taper to seat at the same time as the fixture plate hits the surface of the rotary table.
 
Got a few minutes to mess around with it, and extracted the plug. Now at least I can centre it up if I need to use it. Still looking for opinions/success stories on using a thread on chuck w adapter on the rotary table
 

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Jswain said:
Still looking for opinions/success stories on using a thread on chuck w adapter on the rotary table
Click to expand...
Yes you can make a threaded adapter that will accurately locate your lathe chuck. Thread on lathe chucks have a radial locating area on the headstock side of the thread. You have to lap this to the same dimension in your adapter and lap the OD to the bore side in your rotary table. Your adapter needs to continue to the bottom of the table where a nut can pull it down for rigidity.
 
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