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Thread: calculating tooth thickness in spur gears

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  1. 11-02-2010, 09:07 AM #1
    coykiesaol
    coykiesaol is offline Banned
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    calculating tooth thickness in spur gears

    hi

    i need a help in calculating correct tooth thickness for involute external spur gear

    gear data is

    No of teeth =45
    normal module =1.5
    pressure angle =20 deg
    Tip Diameter =69.800 mm
    Root Diameter =65.800 mm
    Pitch Circle Diameter(PCD) =67.5
    Distance between the pins =70.750
    Diameter of Pin =2.000mm
    Addendum Modification coefficient =0.5

    from set of engineering calculation i have done gear but toot thickness is not correctly matching with customers output

    my tooth thickness came =3.08616
    customer tooth thick = 2.9899

    please help me for this. i have not used addendum modification coefficient in calculation.if need to use how to use that?
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  2. 11-02-2010, 12:38 PM #2
    Kiwi
    Kiwi is offline Member
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    1220
    My calculator program give:
    Outside Diameter = 70.5
    Root Diameter = 63.615
    Distance over two 2mm pins = 68.809
    Distance over two 2.5mm pins = 70.76
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  3. 11-02-2010, 04:08 PM #3
    RICHARD ZASTROW
    RICHARD ZASTROW is offline Registered
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    Are you including backlash in your calc.?

    Dick Z
    DZASTR
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