The file 'Indexed Bolt Hobbing Jig For Rotary Tool 3D Printer Model' is (stl,skp) file type, size is 63.8KB.
I never had any luck hobbing a bolt using the tap method. When I used my rotary tool by hand, the teeth came out uneven.
This work in progress jig should allow for either a 8mm, or 5/16" bolt (or rod with nut) to be indexed to 19 positions. The ratchet head was edited from this excellent thing: http://www.thingiverse.com/thing:8752
I put up a short 30 second video of this jig being used. I was holding the camera, and using the rotary tool and making sparks fly all at the same time. With some practice, I feel I will be able to make many bolts for my army of 3D printers.
The idea for this thing came to me after seeing many great ways/things to hob bolts. (That and after the snow I didn't want to go out to the cold work shed) My thing is an amalgamation of many of the ideas found here on Thingiverse:
http://www.thingiverse.com/thing:9291
http://www.thingiverse.com/thing:10360
http://www.thingiverse.com/thing:10110
http://www.thingiverse.com/thing:11275
block_4.stl | 65.0KB | |
hobber_3.skp | 101.2KB | |
rachet_gear_4.stl | 61.6KB |