Z axis falls down when power is off

Im very new to the cnc world and have not even done a first cut on my shapeoko 5 pro yet. I’m currently installing a 80mm vfd 2.2kw water cooled spindle from pwncnc and have been noticing when the power is off and I try to work on the spindle the z axis starts falling. When i initially power off the machine, the z axis will stay where its at, but any amount of pressure i put on the spindle it will fall down. This also causes the green carbide logo light to turn on when the z axis is moving.

Is this a weight issue? Because i thought the shapeoko 5 pro z axis was more than capable of using a 2.2kw 80mm spindle

It’s a sign of the low friction/resistance of the HDZ ball screw — when powered it’s more than able to hold and move things.

Is this something that can be fixed, or something I just need to live with.

It’s not broken.

I keep a block of foam under the Z-axis on my SO3 to catch it when it lowers.

1 Like

With the heavier 80MM spindles others have reported the HDZ slowly falling with the power off. With the power on the stepper motor keeps it in place. With the power off there is nothing but the friction of the bearings and the bearings of the ball screw holding the HDZ up. So it is normal but annoying to have the Z drop down. As @WillAdams stated there is nothing broken. The 80MM spindles are quite heavy and you just have to work around it.

1 Like

Thanks for the help gents

Just adding onto the reassurance. Happens on the hdm aswell. I use a wooden block to support it when its powered off.

1 Like

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.