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    Old thread on coming up with PA - especially post...

    Old thread on coming up with PA - especially post #15

    https://www.practicalmachinist.com/vb/general/how-determine-gears-pa-203860/?highlight=base+pitch

    have fun
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    Here is a little scan from about 100 years back...

    Here is a little scan from about 100 years back (Union Twist Drill). The 14.5 tooth space is visibly wider at the bottom compared to the 20. The 20 - with its wider base, is "stronger". You could...
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    And its a helical gear - not "straight cut" ...

    And its a helical gear - not "straight cut"

    (unless the camera is making it look helical)

    A straight cut 20 tooth 8DP would be 2.75 OD (22 divided by 8)

    The extra OD comes from it being...
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