I was thinking of installing a blank in the 4th axis vertically, then using
a small ballnose endmill across the top of the pulley to shape each tooth.
I'm not sure of the profile; if it is a simple semicircle, then it would be
simple case of cutting across the pulley for each tooth, and maybe a clean
up pass or two to get rid of the burs.
I've been doing a lot of googling. There is an ISO document, #5294, which
contains pulley information...
Specifies the principal characteristics of sychronous pulleys
for use in synchronous endless belt drives for mechanical power
and where positive indexing or sychronization may be required.
The principal characteristics include: tooth dimensions and
tolerances, pulley dimensions and tolerances, quality specification.
Has anyone seen this document? Does it contain enough information to make
CAD drawings of the pulleys. I wasn't willing to part with my money until I
knew the document contained what I needed. As you said, most supplier's
catalogs contain belt tooth dimensions, and pulley OD and PD dimensions.
Frank
> -----Original Message-----
> From: Erik Christiansen [mailto:dva...@internode.on.net]
> Sent: Saturday, 7 November 2009 9:09 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] G2 moves puzzle
>
> 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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