MPCNC Z anti-backslash compensation wheel
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MPCNC Primo Z axis backslash compensation ratchet wheel. Placed on bottom, lead screw is pushed down over soft material.
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- Printables
- Kategoria
- Mechanical Parts
- Licencja
- GNU General Public License v2.0
My MPCNC had noticeable backslash on Z axis, so I added same lead screew nut to the bottom of Primo core.
This model is created in FreeCAD and project file is available for download. Should be printed from PETG with layer height 0.2mm. Lead screw is pushed down over spacer from soft material, the pushing force can be adjusted by ratched wheel. If the steps are too big, you can use thicker spacer with lower density for more squeeze steps.
This wheel is on the bottom side of the core. Only simple modification is needed - re-drill the bottom hole to bigger size with 11mm drill. (I enlarged it via vacuum hole in my desk, so no gantry disassembly needed).
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For assembly you will need:
- 1x DIN 912 (Hexagon Cap Screw): M3x20
- 2x DIN 912 (Hexagon Cap Screw): M3x12
- 3x DIN 985 (Self-locking nut): M3
- 2x M3 spacers
- 1x Rubber spacer
- 1x Lead screw nut same as on top of the Primo core
- 1x Longer lead screw - same length as Z tubes
Mount the lead screw nut with spacer first. Slightly tighten. Then push over the ratchet wheel with proper orientation of screw (now you can tighten it). Finally mount the pawl and two screws.
