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Re: [TowerTalk] Friction (was Mast Clamps)

Subject: Re: [TowerTalk] Friction (was Mast Clamps)
From: "Mark ." <>
Date: Mon, 06 Mar 2006 09:17:48 -0500
List-post: <>
...without 'sticktion' we wouldn't have the wonderful sounds of all the 
bowed instruments in a string orchestra.

And without the 'sticktion' effect, we wouldn't have to whack those old 
finicky gadgets to get them to start!  Ever bring an old hard drive back to 
life with a coupla good whacks? They still work!

We, umm..... at work still emply this technique for troubleshooting. We get 
away with it by calling it "the Technical Tap."

About calculus - join the club! I've forgotten most of mine, too.


>In the long and useful thread about mast clamps that slip under torque, 
>several contributors have discussed the friction between the clamps and the 
>mast.  I'll point out that the linear relationship for friction force 
>F=mu*N is only a model (an approximation) that works pretty well in most 
>cases -- but not in all cases.  Indeed, we commonly hear about "static 
>friction" and "sliding friction", because the simple linear model neededd a 
>little modification.  I've heard some Mech E's mention "sticktion" (sp?), 
>and it sounded like they meant something other than static friction.

<<I just dug out my old Calc based physics book trying to find the names and
formulas.  When it comes to sliding somehting it is a two stage problem as
it takes more force to start the movement than it does to continue the
movement. Of course you can use calculus . It's amazing. I don't think I
could now answer enough of those problems to even pass the course and I have
a math minor.  I never had to use any of the math since I graduated.>>


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