Re: Flat rubber belts and pulleys

<meow2222@xxxxxxxxx> wrote in message
news:1173208310.690754.164920@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On 5 Mar, 18:23, "N Cook" <diver...@xxxxxxxxx> wrote:

Can someone explain to me how bulbous/baluster pulleys centralise a
belt.

The centre fattest part of the bulbousness travels faster, because its
wider, thus pulls the belt more than at the ouer edges of the drive
wheel. Hence the belt is pulled towards the fatter wider centre.

As for whats-it-called wheels, the slave ones, the belt position on
them depends on the driving wheel, which feeds the relatively slack
belt to the secondary wheel.


And why the belt does not slip off parallel sided , ie non bulbous
flywheels
with usually no flange on one side. The chances of grime or shine on one
side or the other of belt or pulley should easily lead to a belt comming
off
such flywheels , shouldn't it ?

grime is distributed fairly evenly in practice. But there is normally
no slippage occurring between belt and drivewheel, so friction level
has no effect. You'd need a very dirty and very slack belt for this to
occur.


NT


I'm surprised they only seem to fall off if the belt is perished or someone
meddling inside the mechanism or as a result of some fault or jam.




.

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