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Difficulties in removing ER-chuck from BLDC spindle motor

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PekkaNF:
Bought this sort of pagage years ago, but really haven't put it to any good use yet.


I would like to remove the ER-chuck from the motor shaft and replace it with a poly vee belt pulley.

The chuck has two oposing set screws - they are easily removed. I noticed that they bear on plain shaft - there are no flats.

I supported the chuck and pressed the shaft with an proper drift punch and shop press with moderate force. It did not move. motor shaft is 8 mm and drift was slightly less. I did expect it to pop out with a very little force. No sign of glue, but there could be some.

Plan "B" is to make the poly vee pulley mount over the ER11-chuck. Possible, but not ideal.

Wondering how tight it should be?

djc:

--- Quote from: PekkaNF on August 15, 2019, 11:15:00 AM ---I would like to remove the ER-chuck from the motor shaft and replace it with a poly vee belt pulley.
--- End quote ---

Remove in one piece for possible re-use or just remove?

If you do not want the chuck, use the motor as its own lathe and turn down the chuck until it is thin enough to peel off. If you can shield it a bit, the redneck version of this procedure uses an angle grinder.

You might be able to dismantle the motor sufficiently to keep the important bits cool and heat the chuck to denature any thread locker.

awemawson:
Could it have had Loctite or similar put on it when assembled?

If so moderate heat should break the bond

Joules:
The screws will have scored the shaft and pretty much locked it in place.  You could try bagging the motor and put it in the freezer overnight.  Then hit the chuck with some heat and see if it will budge.  That would also sort out any Loctite if present.

PekkaNF:
Fine if it comes out voluntarily, but I don't need to save the chuck. It would be really slow going if turned from 16mm OD near down to 8 mm of steel chunk. The motor is sort of 12000 rpm 400W model, pretty low torque for turning.  Might work out by mounting it onto grinder table and wearing it down with grinder.

Maybe I wrap it into cling film and chuck into freezer overnight and hit it with a hot air gun when it is in shop pres and give it one more try before resorting into anything more destructive.

This model has HAL-bits and I would hate to wreck the motor sensors or bearings. These are not as robust as typical AC-motors.

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