Posted by DR. EVIL on February 19, 2018 at 07:00:43 from (174.197.8.238):
In Reply to: Gear cutting question posted by Fritz Maurer on February 18, 2018 at 19:41:59:
Cutting a gear on a lathe indexed off a smaller gear with the same number of teeth seems like a Very imprecise method of machining/manufacturing. Proper method of cutting gears is with a cutter called a hob. Mitsubishi also includes a very accurate gear cutting programming package in their wire EDM machines. You almost don't have to do any secondary gear tooth machining and finishing operations with the EDM gears.
We had a machine at FARMALL called a Shear-Speed gear former. Machine took a stack of gear blanks, already turned and center bore turned or broached. The machine had a specially ground cutter for each space between gear teeth. A cutter head held the cutter teeth, and the machine advanced the cutters about .001"/.002" into the gear blanks on each stroke. The gear teeth still needed finishing, normally "Shaving", oon a Red Ring Gear Shaver. We also had a bunch of small Barber-Coleman gear hobbers for small pump gears we machined from blanks supplied from West Pullman Plant. One machine ran one part number. We ran that machine when we needed that part number and it sat unused until we needed more.
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