Show HN: Chalkbot

#1

Post by tunavargi » Sat, Jul 23, 2016, 3:29 PM UTC

Show HN: Chalkbot
engineering.hipolabs.com

Re: Show HN: Chalkbot

#2

Post by rosalinekarr » Sat, Jul 23, 2016, 9:32 PM UTC

I wonder what this would look like if they could speed up the motors and smooth out the motion with some more taught string. Maybe they could recreate more hand-like motions.

Re: Show HN: Chalkbot

#3

Post by mangodrunk » Sat, Jul 23, 2016, 10:08 PM UTC

rosalinekarr wrote: post #2

I wonder what this would look like if they could speed up the motors and smooth out the motion with some more taught string. Maybe they could recreate more hand-like motions.

If you're in San Francisco, at The Interval, they have a chalkboard drawing robot similar to Chalkbot: http://blog.longnow.org/02014/03/13/interval-chalk-board-rob... Also, https://www.youtube.com/watch?v=GpQzIaH90f8

These projects are really cool.

Re: Show HN: Chalkbot

#4

Post by kator » Sun, Jul 24, 2016, 12:11 AM UTC

I built a dual axis laser pointer setup to play with my cat but she looks at the servo's too often because they're so noisy. I was wondering if I could use memory wire to control the laser pointer since it would be quieter.

Now I'm wondering if these stepper motors might be a better alternative, maybe a third one against some sort of a spring loaded harness.

Either way very cool, would be interesting to see if a third motor might have helped rather than relying on gravity and good behavior of the chalk pen.

Re: Show HN: Chalkbot

#5

Post by chris_st » Sun, Jul 24, 2016, 12:21 AM UTC

That's great! Thanks for detailing what went wrong, as well as what went right.

I've wanted to do a drawbot (paper and pen) for a while, and thought these pulleys[1] and belts[2] might be good.

1: https://www.adafruit.com/products/1251 2: https://www.adafruit.com/products/1184

Re: Show HN: Chalkbot

#6

Post by [deleted] » Sun, Jul 24, 2016, 2:23 AM UTC

[deleted]

Re: Show HN: Chalkbot

#7

Post by Qworg » Sun, Jul 24, 2016, 2:49 AM UTC

And here I thought it was the Nike Chalkbot: http://m.youtube.com/watch?v=HmW-eGCrSxs

Still cool though!

Re: Show HN: Chalkbot

#8

Post by colindean » Sun, Jul 24, 2016, 3:49 AM UTC

Qworg wrote: post #7

And here I thought it was the Nike Chalkbot: http://m.youtube.com/watch?v=HmW-eGCrSxs Still cool though!

Nike Chalkbot was a project by Pittsburgh-based Deeplocal: http://www.deeplocal.com/projects/chalkbot.html

Re: Show HN: Chalkbot

#9

Post by Qworg » Sun, Jul 24, 2016, 4:23 AM UTC

colindean wrote: post #8

Qworg wrote: post #7

And here I thought it was the Nike Chalkbot: http://m.youtube.com/watch?v=HmW-eGCrSxs Still cool though!

Nike Chalkbot was a project by Pittsburgh-based Deeplocal: http://www.deeplocal.com/projects/chalkbot.html

Definitely! It was before my time there - but Deeplocal is great.

Re: Show HN: Chalkbot

#10

Post by StavrosK » Sun, Jul 24, 2016, 10:42 AM UTC

Very nice! I made a similar ones with LEGO Mindstorms in three dimensions:

https://youtube.com/watch?v=blYpo2qB_LI