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Terry Coombs[_2_]

wrote:
On Wed, 30 Mar 2016 18:19:21 -0500, Karl Townsend
wrote:

Complicated subject. You've got more questions you don't even know to
ask yet.

Get the bible on gear cutting:

"Gears and Gear Cutting" by Ivan Law

I've seen a couple good You tube videos also.
Karl is correct about Ivan Law's book. But if this gear is for a
threading dial than you don't really need a gear that has traditional
teeth. Just properly shaped pins would work because there is almost no
load on the gear. It is after all just an indicator. Unless you cut a
worm gear there will only be a line contact between the gear and the
worm. The proper hob for the worm gear will resemble the worm, in your
case the leadscrew. I have cut gears successfully using the info from
Mr. Law's book. The book isn't very long but is packed with easy to
understand information. It even has plans for making a tool for making
gear cutters. The tool has a couple eccentrics on it that enable a 12
tooth gear cutter to be cut in the lathe because each tooth is backed
off as the tool rotates. So there is constant relief for each tooth
while at the same time the tooth profile doesn't change and sharpening
only requires grinding the top of each tooth.
Eric

Don't you mean to sharpen you just grind the FACE of each tooth ?

--
Snag