[Robotgroup] bead chain gears

[Paul Atkinson]

Rick,

I think Gray was looking for the gear to drive a beaded chain. Is there any
chance the pulleys for the paper drive you mentioned are available on an old
printer? I think I've heard it called a sprocket drive, because it drives
pins that engage the holes in the paper.

Paul

On Wed, Feb 20, 2008 at 9:57 PM, Richard Abbott <dlluwh at sbcglobal.net>
wrote:

> Gray,
>       I just love printers. Even when they don't work, they can still be
> of use. I don't know about any of the newer types, but the older ones had a
> cogged belt that carried the print head back and forth. They are about 10"
> or so long,and many of them come with a matching gear at one end, and one on
> the drive motor. If you need more length, you might be able to splice two
> belts together, and have your pulleys arranged so that they don't run over
> your splice. Just a thought.
>  Rick
>
> Gray Mack <gray_mack at yahoo.com> wrote:
>  I still have not had any luck in making bead chain
> gears. I want to use bead chain to get linear movement
> from a pair of stepper motors in a frame.
>
> I tried PC-7 compound but it was too sticky to work
> with and I tried clay, but its hard to get a good
> round gear where the bead dimples align when you get
> around the circle. I guess I could try measuring,
> marking and hand cutting some plastic. Seems like I
> need some sort of protractor vice thingy, but ideally
> this would be a maker type project that wouldn't
> require a machine shop to complete.
>
> Also I was trying to work with the small 1/8" bead
> chain but I can get the larger bead as well. I went to
> several Goodwills but didn't find the kind of
> mini-blinds that have one. I guess I can press forward
> with some rubber pullys for now to proof the concept,
> I would just expect some amount of slip to occur over
> time with that system.
> Any suggestions?
> -Gray
>
>
>
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