[Discussion] where to get rack and pinions?

[Mr. C K]

Use a toothed printer belt ,-ck
On Jan 23, 2012 10:49 AM, "Robin Paulson" <robin at bumblepuppy.org> wrote:

>  On Mon, 23 Jan 2012 10:27:06 +1300, Tolley, Gary wrote:
> > What exactly are you wanting them for Robin?
> >
> > A simple way is to cut a belt in half from a printer, RC car/heli,
> > stick it down to a piece of wood/aluminium, and use the pinion that
> > usually meshes within.
>
>  i have a plate, around 500mm long. on it there will be mounted 4 tape
>  playback heads salvaged from tape cassette players, aligned in a row,
>  with tape threaded through them all. the heads need freedom to move
>  along the plate, on a 400mm long track, so varying the gap between them,
>  and hence the amount of tape between them. each head needs a freedom of
>  100mm total
>
>  this probably isn't at all clear. i'll put a scanned sketch on my
>  website, and send the link later
>
>  if anyone has suggestions for other methods of doing this, i'd be
>  interested to hear them
>
> --
>  robin
>
>  http://fu.ac.nz - Auckland's Free University
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