I still can't get "drop table" outta my head

Mostly Printed CNC - MPCNC Hardware Development
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… as well as EMT conduit tables.

And the 525 roller piece is too much fun to play with, so I made this clamp:

to be uploaded soon is a bearing bracket that will hold a 608 bearing in the middle of the roller piece. The hole in the middle clears a NEMA17 stepper and 608 bearing. Woohoo!

This should let me use foot-long 3/4 EMTs as legs and big flat MDF as base, the machine be its own table, and then install a leadscrew (or 5/16 allthread wtf) at each corner. Then come attachments to support a full size drop table supported from 4 corners meaning I should be able to use something more hefty. Of course the 4 steppers driving them would be run in series, maybe with some multiplexing tricks to allow driving only one of them at a time to facilitate leveling.

Next is a version to mount a stepper perpendicular to the conduit.

mmm. Smells like fun.

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Can’t wait to see it in action.

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The arm meant for plan A. Thoughts?

It’s just an OpenSCAD script. Would they line up correctly for sizes F and J? I only deal in 3/4 EMTs.

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@Ryan what is the center to center distance of the two Z rails for all sizes? Inspecting the size C STLs give me 67-67.5mm, but I can’t be sure.

For plan B I’m deciding whether I should remix the standard XYZ plate like the guy did or design a new piece to be bolted between two XYZ plates.

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I’m not sure what you are going for here but if you want something to fit all three is is best to pick one and incorporate the tool mount.

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I’m optionally going for a version of this using your standard pieces. My so-called plan B.

This measurement will also let me build a fixed (no stepper) Z axis that I just bolt in place when I install a drop table.