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Hi Kim,My previous post covers the whole thread on making and using the helical gear cutting fixture. Somewhere in the archives is a posting by Don Darbonne where he made a spread sheet covering all the facets of the calculations. I believe Marv Klotz also has a program for calculating the gear number. Basically a fixture is made with a block and spindle to hold the gear blank. At the indexing end is a pair of discs, on fixed to the spindle and the other with the indexing holes. Between the discs and the block is a 1.00" diameter hub that holds a spiral piece of metal that is formed from flat stock using the calculated numbers for whatever pitch and helix you are going to use. The helical piece of metal rubs against a follower arm with a small ball bearing at the end. As the helical template is rotated against the follower it rotates and advances the spindle thereby cutting a helical path on the gear blank. gbritnell