[Lab] more drawbot

Mark Stephenson mark.b.stephenson at gmail.com
Mon Oct 10 11:19:27 EDT 2011

Hi Darcy it might also be interesting to consider a means for the pen
to move on a z axis (not sure if that is the right axis) so that it
can selectively touch the paper or not. This might also allow you to
take advantage of increased pressure and use a brush style pen that
could give you a varied width line.

I'll try and remember to bring a brush type pen with me next time, I
think that would look neat with what you have today.


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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Mark Stephenson
mark.b.stephenson at gmail.com | http://ca.linkedin.com/in/markstephenson

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