Mostly Printed CNC ACME Nut Bracket

thingiverse

DO NOT USE! Tested, and failed. the 5/16" SS rod provided almost no backlash, where this allows the Z axis to "float" about 0.25mm when cutting fast, leaving a rough surface. Might work well for a 3d printer or laser cutter build; but any sort of spindle will jump. NOT TESTED! Still waiting for my ACME Nut This is designed to fit the C Center carriage for the MPCNC, to replace the threaded rod and coupling nut with an acme screw. The ACME Nut from ebay should slide in, but it will be a tight fit. Recommend (carefully) heating the acme nut to ~230C, and seating it in by re-flowing the ABS. Less play = less backlash. Fit must be very snug. This is the soul of your machine! Hardware: 4x M3x20 Panhead bolts 4x M3 Locknuts Again, this has not been tested yet, just a rough draft. Print Settings Printer: CTC Bizer MK8 Rafts: No Supports: No Resolution: 0.2 Infill: 55% Post-Printing Because the nut holes on the bottom are bridged, you will have to clean the bottoms of the holes. Personally, I use an M3 nut wedged on a soldering iron set to 230C, push it into the holes slowly, and re-flow the poorly bridged material, to make a nice clean surface. How I Designed This Designed with OpenSCAD; by importing the existing part, and filling the holes with cylinders to confirm center. Source file included.