Re: [ATM] How to Reduce Bearing Friction

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

> What is the simplest way to reduce the friction on this axis? I was
> considering doubling the surface area of the Teflon pads but I wanted to
ask
> the group to make sure this is the correct action.

Doubling surface will not make a difference.

Kinetic friction is proportional to the normal force (not pressure), so the
only way is to either change the weight or the Coefficient of Friction.
Using oil (don't know about wax) can decrease the CoF, check out the web for
the best combination

Also the force felt with the AZ motion is caused by torque, which will
increase when the teflon pads are placed more excentric. So, taking away
some of the weight by placing a teflon ring around the axis would be a
goodsolution, provided that the box flexes sufficiently.

Finally, the CoF will increase very slightly when pressure is increased.
Increasing pressure can be done by decreasing contact area, e.g. by
roughening the surface. This may actually be the reason why ebony star is
used so often; it's bumpy surface increases pressure and hence the kinetic
friction a bit. The already tiny difference between static and kinetic
friction is reduced even further, providing the buttery stictionless feel.

Arjan te Marvelde

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