[Lab] more drawbot

[Michael Ayukawa]

This can work.
I've used a combination of electro-magnet and permanent magnet to enable both a static
connection and a dynamic release, based on a DC pulse of the electromagnet.
Just use a ferro-magnetic material as the core of the electromagnet.  
The trick would be to see if you could do with an axial field so the pen could be self
centering.
I wonder if the drawbot could electrostatically draw ink from a fine tipped pen or capillary tube
to a charged surface where the paper could be attached.
/Mike

On 2011-10-10, at 7:24 AM, Jean-Marc LeBlanc wrote:

> 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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