Z axis drops at power off

[Sam0117]

Hi Mr.ben I have infeeling that your stepper motor is faulty or wired wrong? When a stepped motor has its pairs correct the motor won’t turn unless it has a signal to move, so when you power off you shouldn’t have the z axis drop, sorry I can be more helpful but I’m confident you have a problem either with the stepper motor or how it’s been wired up

Hope this helps 👍🏼

[Clive S]

Hi Mr.ben I have infeeling that your stepper motor is faulty or wired wrong? When a stepped motor has its pairs correct the motor won’t turn unless it has a signal to move, so when you power off you shouldn’t have the z axis drop, sorry I can be more helpful but I’m confident you have a problem either with the stepper motor or how it’s been wired up

Hope this helps 👍🏼

This statement is incorrect. When a stepper is not energised it can free wheel and will when the Z is heavy. Some machines have an electric brake on the Z motor for that reason.

[Ger21]

He's using a servo, so it's not relevant.

What you really need is a servo with a brake.

[johnsattuk]

As pics