Hello..
I've read posts here from others that have claimed that removing a rotor from a servo motor will result in loss of magnetism.
I have a kollmorgen servo motor that had it's rotor removed for close to a year (that's the way I pulled it from the junk pile). Before installing it I checked it with a steel ruler and found that the magnets had plenty of pull.
Upon installing the rotor and spinning it I found that there was plenty of power coming out of it. shorting any of the phases makes it very hard to turn, all three phases shorted makes it VERY hard to turn.
Spinning it by hand and touching the phases together makes a impressive spark.
I've had the rotors out of a number of Allen Bradlys with the same results.
I've NEVER played with a Fanuc so I can't say what you'll find.
About turning down the shaft, not sure how you would chuck it in the lathe, would depend on the rotor.
What might be a problem is the encoder/reslover Some are very very tricky! if the intentions are to TOTALLY give up on the "SERVO" part of the motor and use it ONLY for an alternator the encoder can be trashed when the rotor is removed.
On another note, I recall ZUBBLY once talking about running a three phase motor and using a file to "square" up a tapered shaft. It's been a number of years.. I think Zubbly filed down the shaft and then brotched (SP??) a key way on the shaft.
I don't know about holding tolerance! Taper locks can be very fussy!
Depending on the motors voltage rating, you may be able to apply three phase power to the main power leads and spin the rotor. One would have to be VERY careful and know what kind of trouble they could get themselves into!!
I'm sure that anyone who knows how to use a lathe could handle it. But this isn't for someone with out the proper skills!! both to file down the shaft and to hook up the power!
The larger the power rating... the larger the risk!
Also, be aware that many servo motors have internal brakes! make sure the shaft spins freely!!
Good luck!
ax7
Mark
