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  • Rack and pinion calculation for pressing machine

    ninjadead

    ninjadead

    @ninjadead-EIjKp7
    Updated: Oct 27, 2024
    Views: 1.1K

    I am designing a manual press tool, for installation of frets for stringed instruments.
    What I need help is how long the lever should be?
    While the requirements is pressure of 500 kg on the area on the end of the rack (4900 N/0.00204 m. sq.) and the input force is 20 kg

    The part specifications that are fixed are the rack and pinion.

    I am not sure where should I start? whether the gear sizes and teeth play a part in this calculation or not.

    The pictures from this page shows the overview of the tool I'm going to make.
    #-Link-Snipped-#

    If anything is unclear or you need more information please inform me.

    Thank you very much.
    ninjadead
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  • Kaustubh Katdare

    Administrator • Feb 20, 2012

    Mechanical Engineers! We've an unanswered question here!
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  • saptm

    Member • Feb 23, 2012

    Yes,the gear size and the no. of teeth really important in the manufacturing.Larger the gear size ,larger is the gear ratio, for avoiding interference use have to do some calculations.
    Min teeth required for pinion is

    T=2*Ap/(sqrt(1+G(G+2)sin^2(angle))-1

    where G=gear ratio
    Ap=Addendum of pinion
    angle=Pressure angle

    and Min teeth required for rack is

    T=Ar/sin^2(angle)

    where Ar=addendum of rack and angle=pressure angle
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