Filament Drive Gear Jig

thingiverse

This simple jig can be used for precision hobbing the teeth on a filament drive gear. Instead of using the standard method of cutting teeth with a tap, this innovative jig enables you to create a series of overlapping spot drills that produce sharp, deep teeth that securely grip and eject debris effectively. It is designed specifically for use with 8mm diameter rod. Watch it in action at: https://youtu.be/E4LW0ZjslYc Print Settings: Printer Brand: MakerGear Printer: M2 Rafts: Not required Supports: No Resolution: 0.2mm Infill: 20% Notes: For added stability, it's recommended to print three perimeters/shells. Post-Printing: Firstly, print out both the collet and holder pieces. Next, screw the holder piece onto a board (using two 8-32 screws, spaced 1/2 inch apart) that can be clamped to your drill press. Then, tap an 8-32 thread into the collet for a set screw. To use this jig effectively, clamp the holder in place so that the drill bit is centered over the rod cradle in the holder. I used a 1/8 inch diameter mill-drill bit with a 90-degree tip angle, but you can also use a center drill. Clamp your 8mm rod securely in place in the collet using the set screw and then adjust your drill stop so that you are only drilling about 0.5mm deep. Place the collet in the holder, aligning the nub on the holder with one of the indexing notches in the collet. Drill spot drill holes in all 16 positions. Reset the drill stop depth to 1mm and then re-drill all 16 positions once again.