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  1. For what its worth department I revised George...

    For what its worth department

    I revised George B. Grant's numbers for 10 teeth to suit nine teeth in his book A Treatise On Gear Wheels on page 29

    I made no effort to state minor dia (which is...
  2. Here is a 6 tooth 12 DP I had hobbed for the...

    Here is a 6 tooth 12 DP I had hobbed for the Lockheed project long ago - had a box full done. They are getting on down there for being "pointy"

    325042

    LAC part number 32033A from 90 years back
  3. Good luck on the right profile for only 9 teeth. ...

    Good luck on the right profile for only 9 teeth. Sounds like a hob job since no milling cutters ("gear cutters") do that few teeth
  4. 8239 is Cincinnati number for the 12" "pinion"

    8239 is Cincinnati number for the 12" "pinion"
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