On Sat, Nov 07, 2009 at 10:21:29AM +1100, Frank Tkalcevic wrote:
> While on the topic of toothed wheels, is there a standard forumula for
> timing belt pulley tooth profiles, in particular MXL style?
Looking in my local suppliers catalogue, there's only dimensions for HTD
synchronous belts. i.e. those with the semicircular teeth.
One of the first things I'd like to make, once EMC is going, is some
matching pulleys. Since their gullets seem to be a semicircle centred on
the tooth tip diameter, I thought it might be possible to make a pulley
with cheeks as follows:
Turn a groove in the circumference of the pulley blank, sized to
accept the body of the belt.
On the rotary table, on the mill, drill the gullets through one side,
at the turned diameter, stopping at the opposite cheek.
Even a slot drill would probably leave tiny burrs on the through hole,
some roughness on the opposite cheek, and sharp edges on the tooth tips,
so perhaps such a pulley would chew up at least the first belt run on
it.
Turning after drilling would eliminate the burrs, but what a racket it
would make! Now, would the semicircular tooth snag the sharp tooth edges
on entry and exit, I wonder?
Erik
--
I have not failed. I've just found 10,000 ways that won't work.
-- Thomas Edison
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