The slightly less poor man’s CNC fourth axis
thingiverse
Redesigned the pm4a by ZenziWerken for 9mm plywood. Then I figured I could use a cheap mini lathe chuck from China with a 10mm Z011 axle. The stepper motor has moved inside the box so the bearings align properly to the bearing seats on the shaft. There is room for a 40mm stepper motor maximum. Since gripping power of the chuck is probably the limiting factor I don’t think this will be a problem. Parts and materials used: - 9mm plywood - 2 6000 2RS bearings 10x26x8mm - Stepper motor nema17 max 40mm long - Z011 shaft and chuck (M12) - Spur gears 15 and 60 teeth printed in PETG (or any other strong filament) with 100% infill Alternatively a belt drive could be used instead of gears. I haven’t tried yet but a 15t and 45t with a +/- 188mm belt should fit. —- Update 08/04/2021 - Fixed a little error with slots being not properly aligned. - Added the live center holder parts - Todo: better naming the parts Update 03/2021 - Updated the holes for the bearings so they fit more tightly. Added a new design for the 60t gear. The one in the picture doesn’t have sufficient hold on the shaft and would slip.
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