26 Sep
2009
26 Sep
'09
6:25 p.m.
<4ABC96F8.60500 at gmail.com>
<59DA6696-D341-42ED-A13A-FB17BF62D82C at neurotica.com>
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From: mcguire at neurotica.com
Subject: Re: 50Hz vs. 60Hz
Date: Sat=2C 26 Sep 2009 17:33:36 -0400
To: cctalk at classiccmp.org
On Sep 25=2C 2009=2C at 6:10 AM=2C Sridhar Ayengar wrote:
The same way train wheels work. Train wheels are of slightly
smaller diameter to the outside edge than they are on the inside
edge. Makes the train sit between the rails rather than on them.
Along the same lines=2C the capstan sits in the middle of the belt
instead of on both outer edges.
Umm. Wow. It never occurred to me to think of the capstan riding
in the belt rather than the belt riding on the capstan.
Huh
Back on the belts=2C When the belt has one straight pully=2C
and one of increasing radius=2C it walks up the pully
beause the belt also moves in the direction of the inclined
pully on the straight pully. This effect can be easily seen
by just hanging a belt on the increasing radius pully loose.
Notice that if you turned the pully=2C the belt would walk up
to the higher radius=2C just as it would when taught with
the straight pully.
Once on the crown=2C this effect combines with the
tention effect to keep it centered.
Dwight
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> matter. The ones that we got drawings for and had
duplicated were
> worked from aluminum stock with quite a few processes to harden
> them and
> form the drive surface so as not to eat the drive belt. The
> shape of
> the pulley causes the drive belt to ride in the center when
> properly
> done=2C there are no "edges" to retain it. If you have or can get
Known as 'crowning'=2C at least over here.
It's surping the first time you see it=2C but the pulley is smaller in
diameter at the edges than in the mdidle. The belt runs on the
largest
diameter part -- and mves itself there when the pulleys turn. If you
naively make a pulley with a smaller diamter in the middle (with
the idea
being that he larger diameter edges will keep the belt in place)=2C
the
belt will fly off.
It's called "crowning" here too. How in blazes
does that work?
I've always wondered about it.