Bridgeport Series 1 stepper motor issue.

Alright so I got my machine up and running and it seams like one of my stepper motors has a problem. Basically I can't get my Z axis stepper to move like it should. I've isolated the issue down to just the motor itself, the drive, wiring, leadscrew etc are alright. So I don't really know how I should start testing this motor further to see what exactly is wrong, but I feel like the motor must have lost it's magnetism somehow. It has barely any torque, I can stop the motor with my hands. I tested the inductance, current, resistance, and verified the voltage was the same as the x and y axis , and all those tests point to this being a fine motor, so now I can't help but think that maybe the permanent magnets are what's to blame. I think I will take it to an electric motor repair shop Monday if they're open. Maybe I'm missing something. If anyone has any advice, I would appreciate it.

Is it on the quill or the knee screw?

Some here have mentioned the knee can be problematic.

Have you tried switching it with another axis motor?

It's the motor on the quill. The knee is hand cranked on this machine. I tested the motor on and off the machine, at this point I don't think there is anything more to learn by switching it for another axis, I'm sure it would behave the same on the other axes. Anyway, I should find out if this motor is the permanent magnet, variable reluctance or hybrid type. Just to get an idea of the condition of the motor turned the shaft by hand and it seems like the z axis has less of the cogging effect when compared to the y axis. I don't think the coils are burn't. I think the permanent magnet has lost it's magnetism some time in the past. I'm not sure why the x and y axis are working fine though. Thanks for the reply.

the OHMIC of the Phase shoudt also be the SAME as other Identical Motors and quite less then 3Ohms
Nema24 see offen 1,2 OHM if it is around 5 it is for shure burned

Hi so my CNC Mill is having issues, this video will explain it. I'd like to add that the it's not a problem with the power supply either, the problem persists even if the Z axis is the only one with power!

Thanks Andy for the advice, I will look more into the ballscrew and nut. In response to tommylight, I tested it off camera.