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[ATM] Size does matter
For dry friction:
The CoF is itself dependent on pressure, it rises slightly when the pressure
increases. The slope of the curve is dependent on materials.
The CoF is also dependent on velocity, it will slightly drop athigh
velocities.
For Teflon (PTFE) the CoF is approximately 0.04 (Drag force/Normal force)
For the feel of movement it is better to change bearing diameter. Larger
diameter means more force needed to move.
/Arjan
> Size of bearing pads is one of many adjustments recommended in "The
> Dobsonian Telescope" by David Kriege and Richard Berry. Refer to sections
10.3.4.1
> and 10.3.4.2.
>
> Clear skies
> Don
>
>
>
> In a message dated 12/17/2004 3:05:18 P.M. Eastern Standard Time,
> jerry.p.reddell63@sbcglobal.net writes:
>
> I don't think that increasing the size of the bearing does anything to
> help...The force required to move is directly related to the weight and
the
> coefficient of friction... If I remember correctly the coefficient of
> friction is independent of the area or size..Thus weight is the key....
Now
> if there is a 'tearing' like effect that accompanies the bearing
material
> in operation then maybe so.
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