Short cut to mendel gears

Alternative Mendel gears avoiding much gear filing and with the added benefit of improving precision, this gear started out as a steel pulley. Modified to a drive gear by the addition of M3 grub screw between the teeth and drilling out shaft hole to 5mm .

Grub screw detail. Drilled 2.5mm then tapped M3 thread with M3 tap set.

M3 grub screw created by; screwing two temporary M3 nuts on M3 bolt , cutting screw driver slot in threaded end of bolt, removing 1 nut to remove burs, cut other end of bolt off 4 mm away from screw driver slot end, then file end flat then remove other nut to remove burr.

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