{"id":330,"date":"2016-09-11T19:57:39","date_gmt":"2016-09-12T02:57:39","guid":{"rendered":"http:\/\/www.ferzkopp.net\/wordpress\/?p=330"},"modified":"2016-09-11T20:03:48","modified_gmt":"2016-09-12T03:03:48","slug":"magnetic-pendulum-calligraphy-v2","status":"publish","type":"post","link":"https:\/\/www.ferzkopp.net\/wordpress\/2016\/09\/11\/magnetic-pendulum-calligraphy-v2\/","title":{"rendered":"Magnetic Pendulum Calligraphy (v2)"},"content":{"rendered":"

The improved second generation magnetic pendulum calligrapher with electronic remote-control brush.<\/p>\n

<\/p>\n

After having so much fun with the v1 version of the “drawing pendulum”<\/a>, I decided to improve and build “Magnetic Pendulum Calligrapher v2<\/strong>” by adding a RC car servo with controller for about $80, and re-configuring the pendulum construction and hinge.<\/p>\n

The final construction and prep looked like this:<\/p>\n

\"v2prep\"<\/a><\/p>\n

\"v2setup\"<\/p>\n

The pendulum uses a 1.2m solid wood rod. I’ve experimented initially with a suspension made from a bunch of hooks, but settled on a more flexible suspension made from fishing gear so it can rotate when needed.<\/p>\n

\"v2hinge\" \"v2bearing\"<\/a>
\nIt is one of these physical facts that are omitted from the computer simulation. The magnets have a physical extend, and this causes the pendulum bar to “roll” around its axis in certain configurations.<\/p>\n

\"v2rotationcause\"\u00a0\u00a0\u00a0 \"v2swivelneed\"<\/p>\n

 <\/p>\n

The final constructions looks like this – all the mechanics are simply taped or glued to the rod, and the brush is guided by a plastic tube (a re-purposed toy flute).<\/p>\n

\"v2tip\"<\/a><\/p>\n

\"v2brush\"<\/p>\n

The micro servo could move the brush very accurately and fast up and down:<\/p>\n

\"v2control\"<\/p>\n

I think it worked very well – with the exception of the spinning motion the head tends to develop (see video linked below) since it is not symmetric in weight at all. Still, I was able to write something that resembles Chinese characters.<\/p>\n

\"v2results\"<\/p>\n

I’ll probably need to set it up somewhere other than the garage, and practice my drawing skills.<\/p>\n

A 3min video of the v2 pendulum in action is here:
\nhttp:\/\/www.ferzkopp.net\/Videos\/MagneticPendulumCalligrapherV2.m4v<\/a><\/p>\n

Lessons learned:<\/p>\n