[Lab] more drawbot

Jean-Marc LeBlanc jeanmarc.leblanc at gmail.com
Mon Oct 10 07:24:19 EDT 2011

you could use electro magnents

Jean-Marc Le Blanc

"Do you pine for the nice days of Minix-1.1, when men were men and
wrote their own device drivers?" Linus Torvalds

On Sun, Oct 9, 2011 at 1:04 PM, Darcy Whyte <darcy at siteware.com> wrote:
> I am making a more serious drawbot and want to explore a system for changing
> the pens to get different colors.
> I was thinking.
> What if the pen were held in place by one of those tiny rare earth magnets
> so it's easy to snap in on and off and it also is pretty reliable in terms
> of where it attaches (perhaps two points of attachment).
> Then the gondola could dock itself on a changer mechanism that uses servos
> to rip off the current pen and then attach a new one. Perhaps it could have
> a carousel.
> So there would be three appendages for this drawbot. Left spool, right spool
> and tool changer.
> I think this would work well because it would be auto homing. For instance,
> after you install the spools and the carousel, you just put the gondola into
> the carousel and the machine can pull the cords till there is no slack and
> we are now calibrated.
> food for thot
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