Bolt Hobbing Tool for Metal Lathe
thingiverse
A printable tool is available for hobbing bolts, using two R6zz bearings from vxb.com for a 3/8in bolt. It can also be modified to hob 8mm bolts with 608zz bearings, but with the help of tape for a snug fit. The tool assumes 1/2-inch distance from the bottom of the tool to lathe center on an 8x16 lathe. Print the hobbing tool at high infill with support, remove support, insert bearings, add necessary spacers and nut, then put it in a lathe holder for hobbing.
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