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Odd Gear

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by jmanatee, Jan 2, 2017.

  1. jmanatee

    jmanatee Active Member Active Member

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    Location:
    Southern, NH
    City:
    Alstead
    State:
    New Hampshire

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    I had a customer approach me to make a small gear for a really old piece of farm equipment.

    He had the old gear in his hand but the teeth were very badly worn. He also had a smaller gear that he said matched the gear on the machine perfectly but it was to small and the number of teeth were wrong

    The small gear was 12 dp, I don't remember how many teeth.

    The gear he wanted meshes with a very large internal tooth ring gear (30")


    The gear he wanted and I measured was 1.75" 18 tooth and I assume 12dp because the smaller gear was 12dp

    But the math doesn't work a 18 tooth 12dp gear should be 1.667"

    What am I doing wrong?

    Did they use to make gears different?
     

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