Binary Adding Machine

This is a 3D printable 1/2 scale version of the wooden binary adding machine by Matthias Wandel: http://www.sentex.net/~mwandel/

See a short demo of the 3D printed version here: First time glitched on "32", but second time worked as it usually does: http://youtu.be/GhgaMkGWSNI I may make a better video showing how it adds up a series of numbers, up to 63. The machine resets or wraps around 64.

Educational device to see the binary system in action. Watch as binary bits and bytes toggle in physical form. The steel balls will register the sum of all the values being added together.

Read the article on 3Dprint.com http://3dprint.com/92406/3d-printed-binary-adding/

Based on http://woodgears.ca/marbleadd/
Demonstration of the original wooden model: https://www.youtube.com/watch?v=GcDshWmhF4A

Designed for 5/16" steel balls.

Got mine at: http://www.amazon.com/exec/obidos/ASIN/B004PX9KP4/donscollecti

For the Simplify3D users, I uploaded a Base Assembly factory file with custom supports that worked beautifully for me. The trick is to not let any supports get on top of the exit ramp. You can support the overhang at the top well enough by going next to the ramp.

Inventory Build List

• 1 - Upper Assembly
• 1 - Base Assembly (Supports are required, see notes)
• 6 - Rocker Switch
• 6 - Rocker Post
• 1 - Input Slider
• 1 - Upper Number Bar
• 1 - Result Slider
• 1 - Return Pool
• Guard Rails, as needed, the longer drops seem to need them more.

The Upper Number Bar needs to be glued on to hold the Input Slider in the track.

NOTES:

The rocker post is now a separate part because printing them built-on to the upper assembly allowed them to break off too easily. Secondly, this is the one part that people may need to re-size to compensate for printer tolerances and such. Make sure rocker spins freely on the post before installing. I recommend printing two sets of posts and rockers and taking the best combinations from the lot, else you'll be tinkering with trying to get them to spin freely.

Supports on Base Assembly

I used manual supports, which was less that half of what auto gen supports wanted to do. If you can use my Simplify3D factory file, it will trim about an hour off the print job.

Last Minute add ons

Added the guardrail because balls kept jumping out of the columns, then also added a ball collector so I didn't have to chase them or catch them. Lastly, I redesigned the rocker for an unbalanced swept style version so that the OFF side of rocker is heavier. This insures rocker automatically turns off when not being held ON by a ball.