[modeleng] Re: sprockets

Hi Rich, yep, up at the 'idle' end of the system I'm using two sprockets in
the manner you suggest - hadn't really thought of running multi disks at the
drive end, but it's worth a look.



> Hi there Terry,
>
> If this is what you are doing, then how about just cutting one out of
> every ten teeth, and cutting away the rest of the metal, as you aren't
> trying to transmit much force?
>
> You might need to place guide to help the chain feed onto the sprocket
> correctly (as the self feeding action will be spoilt by missing out
> teeth).
>
> Another alternative, why not place three or four smaller sprockets in a
> semicircular shape, true the barge will look like it is negotiating a
> hexagon or octagon, but it might look good enough?
>
> What do you reckon?
>
> Yours,
>
>
> Rich.
>
>
> On Tue, 31 Aug 2004, Terry Lane wrote:
>
> > No AJ, unfortunately that won't serve - the key to the operation is the
> > chain running around the outside of the (aprox) 500mm dia disk. The disk
is
> > mounted under the turning pond at one end of the set up & the chain
carries
> > the magnets that pull the barges along. The barges will require at least
the
> > 500mm turning circle. I had thought of an MDF disk fitted with pins in
the
> > edge - probably every 3 or 4 links - may even revert to that idea & do
some
> > experimenting yet
> >
> > ----- Original Message -----
> > From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> > To: <modeleng@xxxxxxxxxxxxx>
> > Sent: Tuesday, August 31, 2004 8:40 PM
> > Subject: [modeleng] Re: sprockets
> >
> >
> > > Tel,
> > > Not knowing quite what you want to achieve, or how you are planning to
do
> > > it, this might be a bit of a silly question.
> > >
> > > But, could you not use a 120 tooth sprocket, and either gear it 2:1,
or
> > fit
> > > it with a simple escapement such that it indexes the rotation of the
> > > sprocket by half a chain-pitch?
> > > The latter could be quite easy and might save you making all those
teeth.
> > >
> > > alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > >
> > > www.alanstepney.info
> > > Model Engineering, Steam Engine, and Railway technical pages.
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Terry Lane" <tel@xxxxxxxxxxx>
> > > To: <modeleng@xxxxxxxxxxxxx>
> > > Sent: Tuesday, August 31, 2004 10:21 AM
> > > Subject: [modeleng] Re: sprockets
> > >
> > >
> > > That would be too easy Jeff. Actually I had a look & the biggest 1/4"
> > pitch
> > > sprocket my supplier lists is 125t - fair way short of the 240 odd
teeth I
> > > need
> > >
> > >
> > >
> > >
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