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Gear cutter

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chipenter:
I am making a small worm and wheel for a fouth cnc axis , the calks caled for a ten mm end mill but it was  a nine mm in the box , made the cutter then the worm tried them together wrong profile , checked calks twice wasted a lot of time untill I checked the end mill , have to set up again and redo it tomorow .

Lew_Merrick_PE:
Jeff,

I guess I am misunderstanding your problem.  The worm is merely a (usually) trapezoidal thread that mates to a hob-cut gear.  You can make a hob from an appropriately (trapezoidally) threaded piece of tool steel.  It's a PITA operation set, but its is PITA rather than a problem.

chipenter:
The worm is 14.5 degrees acme thread but the cutter looked like 20 degree presure angle , the one mm diference makes a biger angle .

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