On Tue, 4 Sep 2001, John Yeo wrote:
> I've just seen toothed belts... but i guess a toothed belt could be glued to
> something solid and fuction as a rack gear.
Maybe, but I'm a bit skeptical that it would be optimal. I built a camera
using the plans as published in View Camera magazine several years ago.
This used a piece of chain and sprocket gears with the chain rolled out
flat on the focusing rail. It works, but the pitch of the gears isn't
designed to put much force on the flat chain. The pitch on these gears is
designed to pull the chain around a radius rather than pull it linearly.
Consequently if there is any resistance the mechanism tends to skip.
Since then I've found that rack and pinion materials can be purchased for
less money than the gear/chain combination used in the plans I used. So
... I if you have to decide which to purchase, I'd suggest just getting a
the true rack and pinion. If you are scrounging this stuff for free, well
then that is a different matter, and you'll have to decided if it is worth
tinkering with.
- Wayde
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