[slowtwitch]

Some weeks ago, my "X" axis stepper stopped working. I haven't posted anything due to my ongoing spindle problems

Anyway, the "X" axis kinda froze solid. I couldn't turn the ball screws by hand when the machine was off. I didn't know if it was the stepper motor or the lead screw, that was bad. Fortunately, I removed the 4 bolts that hold the motor in place and was able to turn the ball screw and I was able to get at the set screw on the coupling.

It turns out that coolant has been entering the motor ( small amounts over time), thru the hole where the motor leads go into the stepper.

Upon inspection, i noticed that the leads (at the 3 o clock position)went straight into the motor in a downward fashion, after they go thru the wire restraint at the edge of the table. By adding a small drip loop, would probably rectify this problem.

Here is a picture of the damage..



When i reinstalled the new motor (Keling KL34H280-45-4A, 640 oz-in), I positioned the lead opening at 6 o clock.

After hooking everything up, my "X" is running again

Hope this helps ...


pete

[mcphill]

Thanks for the heads up!