Re: When to keep quiet (was about ABS Sensors)

["Chief Goblin" <chief_goblin@xxxxxxxxxxx>]

Lets find out who is right.


>A single "particle" weighing 0.01 GRAM can screw up the 
>ABS if it sticks between two teeth, changing the wheel
>from X teeth to X-1 as far as the edge detector inside
>the ABS software sees.

What teetth?? Do you know how ABS sensor look? The magnetic parcticles 
can be located on the outside of the magnet, not the inside. You are 
talking about the ABS software as the "GREAT UNKNOWN GREY AREA". 
ABS Sensor consists of a coil inside the magnet. Magnetic parcticles 
accumulate on the outside of the magnet. When the wheel is in motion, 
ABS sensor produces a sinosoid. Magnetic parcticles can reduce the 
amplitude of the curve, but they can not change the  phase, since their 
position is constant to the position of the magnet. What you are saying 
could be true, if the parcticles would move freely around the sensor, 
but it is not the case.

>
>Now.. 4 wheels.. 3 at X teeth per second, one at less
>
>WHOOPS it's SLIPPING.. (in Picard's voice) #1 ENGAGE (abs/ast/etc)
What are you talking about??? Let me get my R2D2 for calculations :-)) 
>
>Please for the love of all that is HOLY,
>if you don't have practical experience with a
>subject, don't spout raw science and lead some
>poor car owner down the wrong road
>
>It then takes those of us who know, and give a damn
>time to correct it, so someone doesn't look somewhere
>else and spend needless $$$
First, since you don't know about my practical experience, why are you 
writing about, to make yourself look good? I've dealt with fair amount 
of ABS Problems, 90% of all problems are due to faulty ABS Sensor. 
Second, I didn't say, go and buy the sensor, I said, check the 
resistance, if the resistance is not correct, than the sensor is 
deffective. Resistance should be the same, regardless of magnetic 
particles. If the resistance is correct, problem is elsewhere. 

"Cleaning sensor advise" wastes people's time. Any person with good 
knowledge of Sencond semester college physics will tell you, that metal, 
which is not moving relatively to the magnet and the coil, can not 
change the phase. Otherwise, show me the formula!!

Mike 


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