Comments on: Thing-a-day, Day 19: Whiteboard Bot http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/ Making Hacking Programming Building Designing Dreaming Thu, 25 Feb 2010 08:30:14 -0500 http://wordpress.org/?v=2.9.1 hourly 1 By: del.icio.us links-- sketchbook http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-4023 del.icio.us links-- sketchbook Tue, 24 Jun 2008 13:41:22 +0000 http://www.cibomahto.com/?p=158#comment-4023 [...] C i b o M a h t o . c o m » Thing-a-day, Day 19: Whiteboard Bot (tags: arduino device drawing) [...] [...] C i b o M a h t o . c o m » Thing-a-day, Day 19: Whiteboard Bot (tags: arduino device drawing) [...]

]]> By: mahto http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-3013 mahto Mon, 12 May 2008 06:30:29 +0000 http://www.cibomahto.com/?p=158#comment-3013 Hi David, Thanks for the suggestion! I will keep that in mind for the next version. I more or less gave up on this design because the servo motors weren't able to respond quickly enough to make drawing repeatable. I got some steppers and drivers, but haven't gotten back to it :-/. Hi David,

Thanks for the suggestion! I will keep that in mind for the next version. I more or less gave up on this design because the servo motors weren’t able to respond quickly enough to make drawing repeatable. I got some steppers and drivers, but haven’t gotten back to it :-/.

]]> By: David http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-2966 David Fri, 09 May 2008 19:19:34 +0000 http://www.cibomahto.com/?p=158#comment-2966 The counter weight is not the problem (keep the one you have). It's your platform under the stylus. It's too wide. You need the connection of the string to be closer to the pen from both sides. For down and dirty testing, pull out the duct tape, tape your weight to the pen, tape the 4 connection points of string to the pen (2 near tip, 2 far from tip). That will steady it out quite a bit. The counter weight is not the problem (keep the one you have). It’s your platform under the stylus. It’s too wide. You need the connection of the string to be closer to the pen from both sides. For down and dirty testing, pull out the duct tape, tape your weight to the pen, tape the 4 connection points of string to the pen (2 near tip, 2 far from tip). That will steady it out quite a bit.

]]> By: mahto http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1881 mahto Thu, 21 Feb 2008 16:47:39 +0000 http://www.cibomahto.com/?p=158#comment-1881 Hi Johntron- I've got a somewhat heavy flywheel attached to the bottom, is that the sort of thing you are referring to? <a href="http://www.flickr.com/photos/cibomahto/2279288882/" title="Building the platform by cibomahto, on Flickr" rel="nofollow"><img src="http://farm3.static.flickr.com/2192/2279288882_58f9ea5dfb_m.jpg" width="240" height="180" alt="Building the platform" /></a> Hi Johntron- I’ve got a somewhat heavy flywheel attached to the bottom, is that the sort of thing you are referring to?
Building the platform

]]> By: Johntron http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1880 Johntron Thu, 21 Feb 2008 16:40:17 +0000 http://www.cibomahto.com/?p=158#comment-1880 Have you tried using a counterbalance similar to the kind used with cameras? Basically, just hang a washer from the bottom of the stylus component. It may help smooth out the drawing. Have you tried using a counterbalance similar to the kind used with cameras? Basically, just hang a washer from the bottom of the stylus component. It may help smooth out the drawing.

]]> By: mahto http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1870 mahto Thu, 21 Feb 2008 09:59:36 +0000 http://www.cibomahto.com/?p=158#comment-1870 Thanks! @Ric- have you seen the SanDraw bot? http://www.notepad.org/SanDraw/ @Andrew- They are probably not very accurate, especially the continuous rotation ones. I was planning to add some shaft encoders, however my friend gave me a couple of steppers today so I might try those instead. Thanks!

@Ric- have you seen the SanDraw bot? http://www.notepad.org/SanDraw/

@Andrew- They are probably not very accurate, especially the continuous rotation ones. I was planning to add some shaft encoders, however my friend gave me a couple of steppers today so I might try those instead.

]]> By: Andrew http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1869 Andrew Thu, 21 Feb 2008 09:17:15 +0000 http://www.cibomahto.com/?p=158#comment-1869 How accurate are the servos? they seem handy for home robotics but it looks like this project relies on the speed of the servos being stable and similar. Have you considered shaft encoders or stepper motors? How accurate are the servos? they seem handy for home robotics but it looks like this project relies on the speed of the servos being stable and similar. Have you considered shaft encoders or stepper motors?

]]> By: nickjohnson http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1861 nickjohnson Thu, 21 Feb 2008 05:27:54 +0000 http://www.cibomahto.com/?p=158#comment-1861 I love the way this device does positioning. It places the pen at the intersection of two circles whose radii are decided by the length of the cable. This is a breath of fresh air when compared to the ubiquitous orthogonal lead-screw design. Thanks for posting this. I love the way this device does positioning. It places the pen at the intersection of two circles whose radii are decided by the length of the cable.

This is a breath of fresh air when compared to the ubiquitous orthogonal lead-screw design.

Thanks for posting this.

]]> By: ladyada http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1860 ladyada Thu, 21 Feb 2008 05:20:23 +0000 http://www.cibomahto.com/?p=158#comment-1860 great minds think very similarly :) http://www.flickr.com/photos/ladyada/2281230002/ great minds think very similarly :)
http://www.flickr.com/photos/ladyada/2281230002/

]]> By: Ric http://www.cibomahto.com/2008/02/thing-a-day-day-19-whiteboard-bot/comment-page-1/#comment-1852 Ric Wed, 20 Feb 2008 13:42:20 +0000 http://www.cibomahto.com/?p=158#comment-1852 You know what'd be really cool? If you were controlling magnets behind the board and the marker was floating mysteriously in front of the board. It'd be a cool seance trick! I love what you've done on this site. The things you are making are incredible. I wish I had time. My Arduino is still blinking 12:00... ;) You know what’d be really cool? If you were controlling magnets behind the board and the marker was floating mysteriously in front of the board. It’d be a cool seance trick!

I love what you’ve done on this site. The things you are making are incredible. I wish I had time. My Arduino is still blinking 12:00… ;)

]]>