My chart for cutting gears doesn't go high enough. HELP

Discussion in 'General Engine Discussion' started by Jack3M, Aug 21, 2019.

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  1. Aug 21, 2019 #1

    Jack3M

    Jack3M

    Jack3M

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    I have an indexing rotory table, but, I need to cut 150 teeth and the chart for the plates included only goes up to 50.

    Math is my weakest asset and I need serious help here. I need to understand the route to the answer also. So my multifold question is, which plate/tooth selection gets me where I need to be. According to my calculations, ya, right, I need to give 0.6 cranks per cut, which seems way wrong and how do I get 0.6 crank accurately?

    Pertinent information:
    90 turns for one complete revolution
    Plate I 15, 16, 17, 18, 19, 20
    Plate II 21, 23, 27, 29, 31, 33
    Plate III 37, 39, 41, 43, 47, 49
    Their calculation for number of turns is:
    90/x=cranks. X=divisions/number of teeth
    90/150=3/10 of a turn ......which isn't the same as the 0.6 for pure division
    If that is correct how do I get 3/10 of a turn with the plates I have? 6 holes on a 20 line?

    As you can see I am very confused. May not have enough information for you to help me. This all pertains to my Mery Engine thread
    https://www.homemodelenginemachinist.com/threads/mery-6-stroke-kit.30814/
     
  2. Aug 21, 2019 #2

    ruzzie

    ruzzie

    ruzzie

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    Jack3M likes this.
  3. Aug 22, 2019 #3

    Jack3M

    Jack3M

    Jack3M

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    Thank you for that link, extremely useful.
     
  4. Aug 22, 2019 #4

    PhilL

    PhilL

    PhilL

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    Jack,
    Do you have a copy of the Machinery's handbook? The dividing head section I have bookmarked in mine because I can't remember the damn formula either.
     
  5. Aug 22, 2019 #5

    Jack3M

    Jack3M

    Jack3M

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    Actually, I do and now I should have looked for it. I never considered the book could help with this. Dang book is a gold mine. I use it every day I machine I think. '

    That link above is better, faster, doesn't allow me to make math mistake, just input errors
     
  6. Aug 22, 2019 #6

    PhilL

    PhilL

    PhilL

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    I never thought there would be "an APP for that." But I shouldn't be surprised either.
     

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