[modeleng] Re: sprockets
- From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 31 Aug 2004 12:09:25 +0100 (BST)
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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