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Thread: 40 Pressure Angle, 36 Teeth 4.285 Pressure Angle, Please help

  1. #1
    Associate Engineer
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    Aug 2022
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    40 Pressure Angle, 36 Teeth 4.285 Pressure Angle, Please help

    I need to create data for special gear for my customer, this manufacturer no longer make. I am trying to make a model with formulas to accomplish this. The only information that I know is the Pitch Dia, Number of teeth and the pressure angle. I think the pressure angle of 40 is what might be causing the problem. Is this because many machine formulas are based on approximations and this pressure angle is so far from normal the formulas do not work? My Base Circle seems way too small. If you cannot help me I understand.
    Thanks in Advance
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  2. #2
    Technical Fellow jboggs's Avatar
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    Mar 2011
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    In my four decades of experience, I have only heard of two pressure angles for gear teeth, 14.5 deg and 20 deg. That's all.

  3. #3
    Principle Engineer
    Join Date
    May 2015
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    There are spline deigns with involute teeth up to 45 degrees but these have "stub teeth". You may have some similar modification to the standard tooth profile that we cannot discern.

    Juvinall, in 'Fundamentals of Machine Design', 1983, Wiley & Sons, states that 25 degrees is also a U.S. standard, (p.464), but I have only seen one set with that large pressure angle.

  4. #4
    Technical Fellow Kelly_Bramble's Avatar
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    Feb 2011
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    It's not uncommon to just specify all of the parameters of a gear with respect to the AGMA standard...

    Modeling a gear is serious work - like the I did with the following webpages.

    https://www.engineersedge.com/gearanimator/

    https://www.engineersedge.com/calcul...ator_15506.htm
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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