[Robotgroup] bead chain gears

[Richard Abbott]

Paul,
       I know that Gray was looking for a bead chain sprocket, but I just thought the timing belt idea might save him some hassIe. I looked all through my printer stuff last night to find any gear or sprocket that would match up to the bead chain in one of my ceiling fans, but nothing was even close. See you tonight. I am bringing my IR distance alerting thing - a - ma - jig.
  Rick

Paul Atkinson <pmatkinson at gmail.com> wrote:
  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 
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 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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