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Thread: Friction in Clearence Fit

  1. #1
    Associate Engineer
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    Jan 2013
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    Friction in Clearence Fit

    I have a problem in finding friction (Theoretically). Actually i am trying to develop an Equation for Friction. I have a Plunger and a guidance of both 5.5mm. With Plunger having g6 tolerance and Guidance with H7 tolerance. Consider that input force is from 1N-10N and the Plunger causes a To & Fro motion. Pls help me in finding the friction equation for this.

  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    F=μN=μmg


    Where μ is the coefficient of friction (either static of kinetic), and N is the normal force. On a horizontal plane, the normal force is just the weight of the object, which is mg .

  3. #3
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Here's an interesting document on "Behaviour of Bolts in Pretension friction applications

    http://www.engineersedge.com/enginee...n-friction.pdf

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