Z-Axis Rigidity Question

I know rigidity in the Z-axis is a big issue with the MPCNC resulting in recommendations of it being no bigger than 81mm.

I had an idea but I do not have the knowledge to know if this would improve, not help, or make worse Z-Axis rigidity.

What if the four legs were stepper motors with thick lead screws attached and the whole machine was raised and lowered rather than using the existing Z-axis machinery in the MPCNC?

Just a thought, curious what the answer is from people more knowledgeable about this than me.

That’s basically the LowRider… :sweat_smile:

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I did not know that, just that its Z-axis was limited to 50mm in the Lowrider.

Yeah, because it’s the same problem. If you raise four feet (or two in the LR’s case) it starts to wobble as well the higher it gets. :smiley:

You can get 100mm with a drop table. With either, useable Z is cut in half due to the tool length. Most endmills can only cut 25mm or less anyway.