My contribution (only the Knode issue)
Ed Greshko
Ed.Greshko at greshko.com
Sun Mar 7 21:53:58 UTC 2010
Les wrote:
> On Sun, 2010-03-07 at 08:45 +0800, Ed Greshko wrote:
>
>> Les wrote:
>>
>>> Do you know that the car has a differential or what that does? The car
>>> would not work without it, but it is not part of the knowledge you need
>>> to drive the car. But you do need to realize that the wheels rotate one
>>> way on one side and the opposite on the other and that they run at
>>> slightly different speeds, if you are going to race. That small bit of
>>> knowledge along with other similar bits would make you the exception on
>>> the course and give you an advantage. It is the same with computers.
>>>
>>>
>>>
>> I hate to mention this...but I wouldn't want to have you as my
>> mechanic. :-)
>>
>> The wheels of a car *do not* rotate one way on one side and the opposite
>> on the other. You have simply changed your frame of reference. Roll a
>> bicycle forward. Standing on one side of the bike, the wheels are
>> rotating clockwise. Stand on the other, they are rotating counterclockwise.
>>
>> A car would work without a differential in much the same way a wagon or
>> cart would. However, when cornering the tires would need to rotate at
>> different speeds. This would tend to cause slipping on one side and
>> dragging on the other and lead to control problems as well as damage to
>> the tires.
>>
>>
> You are both right and missing the point. If you take the wheel off one
> side of a car and put it on the other, its direction of rotation
> changes, because it is mounted to a rim that will only go on with same
> side against the hub. Thus I can say that the wheels do indeed rotate
> one way on one side and the opposite on the other. You said it
> yourself, clockwise on one side and counter clockwise on the other. It
> is an engineering function. And it is not just cornering where the
> wheels rotate at different speeds, but all the time. Tires wear, so
> even if they started out measured to microscopic tolerance, over time
> they would be different diameters. This means the wheels rotate at
> different speeds even going down a straight road. Cart wheels actually
> rotated independently of the axel for this very reason. Look at the old
> wagons, or even roman chariots, the axel is a bar, but each wheel
> rotates on a bearing on that axel. Some basic vehicles use a solid axel
> and just put up with the stress on the axel and wear of the wheels, but
> most alleviate it in some way.
>
> And I would not want to be your mechanic.
>
>
Either you forgot to put in the smiley face at the end or you really are
a grumpy old man....or maybe that is Gene. :-)
Of course I am correct...and of course you are. It is all a matter of
frame of reference, which you didn't establish. Why the heck do you
think I put in the part about clockwise and counterclockwise? In an
earlier message I wrote that I didn't have a sight problem...but missed
the *obvious* from time to time. Looks as if I'm not the only one. :-)
:-) :-)
From time to time this list gets less and less fun as people seem to
take themselves too seriously.
And to think my objective was only steer away from a ridiculous
"conversation" into what I though was a relatively benign one. Nice to
see I was proven wrong yet again. :-) :-)
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