# Calculating Pin Friction

1. Apr 19, 2009

### cs003

1. The problem statement, all variables and given/known data

I'm trying to determine the friction of a pin joint that will be loaded differently depending on the position of the linkage.

2. Relevant equations

I know the equation for frictional force is F="mu"*N, where "mu" is either the coefficient of static or kinetic friction depending on if the surface is in motion, but I'm not sure how to apply that to a pin joint.

3. The attempt at a solution

Im assuming the pin to be "loose fitting" so that friction will be basically limited to a point on the surface. And if I know the force applied to the joint, can I just take that force as N in the equation and and find the appropriate "mu" to solve for the frictional force? I'm just looking for a decent approximation for the friction.

2. Apr 21, 2009

### cs003

Since there have been no respones, should I assume that my logic is reasonable? Or just nobody has a decent idea about it either?
Any input would be appreciated.

Thanks.

3. Apr 21, 2009

### andrew.c

Only in 1st year, but that logic sounds right based on my lecture notes

4. Apr 21, 2009

### cs003

Thanks.

I'm really just looking for a rough estimate of friction, but I was mainly looking for input just to make sure I wasn't overlooking something too major.