arm stuck at lowest position

[Kevin]

I started a build and came back a few minutes later to find that the plate wasn't moving up and down. It went through its homing cycle before I started and when I started the build the platform went down to the bottom like normal. When I came back in it was just making horrible grinding noises and wasn't lifting at all.

I was able to get the platform and the resin tank off the machine but I still can't get the arm to move.

[Kevin]

This doesn't appear to be the same problem that I've had in the past.
viewtopic.php?f=11&t=524&p=4323#p4323

I cannot get the screw to turn with the power off this time

[Kevin]

I'm guessing there's a mechanical issue and I'm going to have to take apart the machine. Any info on a safe way to take this thing apart?

[Kris-D]

I'm not sure if this will help but did you turn it off, unplug the power cable from the back, wait a few minutes for the power to discharge and then manually try to turn the lead screw? I'm not sure you have to unplug the power cable but it's worth a try.

[Kevin]

With the power off I can get it to wiggle back and forth ever so slightly but that is about it.

[mongerdesigns]

Hmm... Highly unlikely that the motor is damaged. Perhaps the anti-backlash nut at the top of the arm is worn out or damaged?

Try removing the 3 screws from the triangular anti-backlash nut, lower the arm safely down, then see if you can turn the motor screw by hand.

[Kevin]

The arm is at the bottom, so after removing the three screws I spun the backlash nut up off the arm and still wasn't able to get the motor screw to turn

[mongerdesigns]

Did you unplug the power cable? Perhaps the switch is broken.

[Kevin]

I did unplug it. There is a very slight difference when the power is on vs. off. When the power is off I can slightly wiggle the screw, when the power is on I cannot move it at all.

[mongerdesigns]

Ok. Email me then. Your motor might be damaged and might need to be replaced.