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# Mechanical engineering other topics FAQ

## Internet Resources

 Press Fits - quick calculator by GregLocock faq404-1230 Posted: 8 Apr 06 (Edited 16 May 07) The equations are called Lame's equations.Here's an online calculatorhttp://www.tribology-abc.comunder interference fits. You have to log in to be able to change the pin diameter.Alternatively desertfox looked up the equations, so you can roll your own:Here are the formulas you need:-           Pa= f*3.142*d*L*Pc   where f=friction coefficient         Pc=contact pressure between the two members         d= nominal shaft dia         L=length of external member.         Pa= axial force required to interference fitto calculate Pc for a given interference use the formula:-Pc=x/[Dc*[((Dc^2+Di^2)/(Ei(Dc^2-Di^2))+((Do^2+Dc^2)/(Eo*(Do^2-Dc^2))-((Ui/Ei)+Ui/Eo))]where x = total interference      Dc=dia of shaft      Di = inner dia of shaft(this is zero for solid shaft)      Do= outside dia of collar      Uo=poissons ratio for outer member      Ui=poissons ratio for inner member      Eo=modulus of elasticity for outer member      Ei=modulus of elasticity for inner memberThis formula for Pc will simplify if the materials are the same. Back to Mechanical engineering other topics FAQ Index Back to Mechanical engineering other topics Forum

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