Hobbing a bolt is not as easy as some youtube videos would have you believe. I do not have a lathe, or a drill stand, and have to do with hand-held tools. First I marked the 13 mm point from the bottom of the head, then I cut a groove in the bolt shank (using the small angle grinder and a steel cutting disc):
Then I clamped the bolt in two 608z bearings in the bench vise, and tried to hob the bolt with the tap fastened in the hand drill:
This did not result in the beautiful hobbed bolt pictured in part 1 of this post. The tap was all over the place, scoring the bolt and generally making a mess. The groove is roughened, and here and there clear "teeth" were cut, but in general not a successful outcome. I'm sure the extruder will extrude, but probably not have much grip, so a new plan will have to be devised. A picture of the result:
The ideal is a "bolthobber", Thingiverse Thing # 232511, but for that you will need a 3D printer (exactly what I'm trying to build here). I need a way to hold the tap fixed relative to the bolt (by hand it bucks and jumps), but I'm sure I will be able to get it done. I will report.
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