Mike RzMachine
Cast Iron
- Joined
- Feb 4, 2007
- Location
- Utah
I have a 1991 Tree Journeyman 325 and purchased a spare servo motor, baldor cc22525, when one popped up on ebay. I want to rebuild this one to be ready to swap into my machine as my Y axis motor is getting slightly noisy.
I took the spare motor apart down to the bearings. I have the front bearing off with no issue and need to replace the rear bearing, which is captured between the tach rotor. There are no obvious features to extract the tach rotor from the motor shaft, no nuts, jack screw threads and the edge of the tach rotor is buried in the motor bearing housing so I can't get a puller behind the tach rotor hub. I have two questions on this:
1. How is the tach rotor intended to be removed? The hub looks like its aluminum, is it on a taper or fixed with loctite?
2. Will the permanent magnets in the tach lose their field strength as a result of removing the magnet ring as a unit from the rotor? I've read that this is possible but don't understand why this might happen. How do user replaceable tachometers like in fadal brushed motors handle this issue?
Thanks for any advice you may have,
Mike
I took the spare motor apart down to the bearings. I have the front bearing off with no issue and need to replace the rear bearing, which is captured between the tach rotor. There are no obvious features to extract the tach rotor from the motor shaft, no nuts, jack screw threads and the edge of the tach rotor is buried in the motor bearing housing so I can't get a puller behind the tach rotor hub. I have two questions on this:
1. How is the tach rotor intended to be removed? The hub looks like its aluminum, is it on a taper or fixed with loctite?
2. Will the permanent magnets in the tach lose their field strength as a result of removing the magnet ring as a unit from the rotor? I've read that this is possible but don't understand why this might happen. How do user replaceable tachometers like in fadal brushed motors handle this issue?
Thanks for any advice you may have,
Mike