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- Feb 1, 2015
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- 9,937
Hell yea we'll get this sucker!
Is this a commercially manufactured product or a custom build? It may be that the collet chuck was fixed to the shaft with threadlock. If the permanent stuff, heat will be required. LocTite states 250ºC. In my experience, without heat, it may as well be welded. You will have to pull the chuck while at temperature. If it cools down, the threadlock will reset.
If you suspect a threaded shaft, I would expect that you will have to disassemble the motor to gain access to a surface that you can grip to resist applied torque. The armature body is a likely choice. I would mark the position of the armature on the shaft and the chuck on the shaft and apply some torque. If you see movement, check to make sure it is not the armature rotating. Armatures are often pressed onto the shaft and can break free. Also check carefully for any associated axial movement, a sign of threading.
Set screws and motor shafts have always been a problem in my experience. They tend to dig into the shaft and if there is some slippage, they will create a burr on the shaft and galling the mating part. Mostly with plain shafts but I have seen it on flatted shafts as well.
This makes it very difficult to remove as the offending metal has to be sheared off or displaced before the shaft can be removed. If this is the case, you should be able t get some rotation with applied torque. You would probably best turn in the opposite direction of normal rotation. Once you see some movement rotate back and forth, increasing the arc as it begins to loosen.