Just bought a Rockwell Mill. can't find model # or serial #

John_Dennis

John_Dennis

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I bought this mill from a guy closing an auto shop.

The motor has been removed by the PO and the wires disconnected. I will try to clean the wires to see if they are still marked, but as of now they are all just black.

I have all the parts for the mill except 1 for the quill feed clutch. I think it is a tapered bushing about 2 inches in diameter.

It is an R-8 quill. I can not find any evidence of a locking pin in the quill. Don't all R-8 quills have some kind of key that stops the tool holder from spinning? Can this be repaired if it is sheared?

Any guesses on the age or model?

Thanks

John

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Rockwell used numbers to denote which wires went to what, I think so don't get too aggressive with the cleaners

Bob
 
AFAIK, yes. There should be an anti-rotate pin. Rotate the headstock clockwise about 95 deg. and look carefully inside the quill for signs of the sheared off pin. It will be past the end of the taper. As to whether or not it can be repaired, it depends upon how the pin was installed. Extend the quill and look for signs of the pin on the outside. If you find it, then it is repairable.

John_Dennis said:
I bought this mill from a guy closing an auto shop.

It is an R-8 quill. I can not find any evidence of a locking pin in the quill. Don't all R-8 quills have some kind of key that stops the tool holder from spinning? Can this be repaired if it is sheared?

Thanks

John
Click to expand...
 
I was able to read enough numbers to figure out the wiring on the motor. The start capacitor is bad and I do not see any evidence of a run capacitor.

I ran the motor for 15 seconds without the capacitor just to verify that it would spin up.

Should this motor have a run capacitor?
 
I hooked the motor up with a new capacitor. Runs great. The belt is not correct and is too short, making speed changes almost impossible.

Anyone know the correct belt length?

Thanks,
 
If it has not been answered already, the Rockwell 21-100 mill R8 spindle does not have an anti rotation pin, at least my 1968 model does'nt. I just finished a tear down/ R&R of my new to me 21-100.
All bearing pairs had old varnished fibrous grease residue, cleaned in solvent, than repacked with Lubriplate 630AA grease (NLGI #1) Machine runs very quietly, will check spindle runout next.

Rockwell 21-100 mill
Atlas 10100 6*18 lathe
 
walzfab said:
If it has not been answered already, the Rockwell 21-100 mill R8 spindle does not have an anti rotation pin, at least my 1968 model doesn't.
Click to expand...

My 1960 vintage 21-100 does in fact have an anti-rotation pin in the spindle.

Baxter
 
Here in an Army manual on the Rockwell Mill http://vintagemachinery.org/pubs/2793/4232.pdf
It contains a ton of info including a bunch of different wiring configurations. The wiring configuration on my mill is on page 67.

The motor on my mill had white numbers right on the black wires

I looked this up a couple years ago and found that these mills did not come with a locking pin for the collet. I never found it to be a problem, and as a result I even took the worn locking pins out of my 5C collet blocks as well.

Hope this helps, Chris
 
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