Hey! This thing is still a Work in Progress.
Files, instructions, and other stuff might change!
Indexed Bolt Hobbing Jig for rotary tool
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Published on December 30, 2011
Description
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: 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.
youtu.be/KpnZK_AJLgM
- Edit -
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:
thingiverse.com/thing:9291
thingiverse.com/thing:10360
thingiverse.com/thing:10110
thingiverse.com/thing:11275
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: 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.
youtu.be/KpnZK_AJLgM
- Edit -
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:
thingiverse.com/thing:9291
thingiverse.com/thing:10360
thingiverse.com/thing:10110
thingiverse.com/thing:11275
Instructions
Print one Ratchet gear
Print one Block
-Place a bolt into the ratchet gear so that the bolt head sits flush with the gear.
-Insert the bolt into the jig block.
-if you have one, insert a 608 bearing into the jig, and snug it in with a nut and washer
-secure the jig in a vice, or clamp. (or hold it if you feel brave)
-use a rotary tool to grind your first tooth into the bolt
-rotate the bolt clockwise one notch
-use a rotary tool to grind tooth into the bolt
-rotate and repeat
This was designed with Sketchup. The skp file has been added for others to work with.
Print one Block
-Place a bolt into the ratchet gear so that the bolt head sits flush with the gear.
-Insert the bolt into the jig block.
-if you have one, insert a 608 bearing into the jig, and snug it in with a nut and washer
-secure the jig in a vice, or clamp. (or hold it if you feel brave)
-use a rotary tool to grind your first tooth into the bolt
-rotate the bolt clockwise one notch
-use a rotary tool to grind tooth into the bolt
-rotate and repeat
This was designed with Sketchup. The skp file has been added for others to work with.
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elk
on
December 31, 2011
said:
Nice thing :) I used a dirty-hack-idea to produce similar bolts (see here: http://www.thingiverse.com/thi... ). My experience was, that around 14 to 16 teeth are the best choice (I startet with 18 teeth and they broke of during a print...).
License
Indexed Bolt Hobbing Jig for rotary tool by ChrisMagno is licensed under the Attribution - Share Alike - Creative Commons license.
More from ChrisMagno
what's the diameter of your cut-off/grinder wheel? i built one but my wheel is so large that the collet isn't resting on the jig. it looks like it is in your photo. -hb
My cut off wheels wear down so the size varys. The Jig is more of a left/right guide. I end up holding the tool at a slight angle to accommodate the disc getting smaller.