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Pulley Logic Gates Stuff

Alexander M. Gorischek
The list author says: "You can build your own pulley logic gates!

See a demo here: bit.ly/pulleylogicgates
See pictures here: bit.ly/pulleylogicgatespics

In addition to this stuff, you'll also want:
1) Three keychain rings, for the input and output
2) Some pieces of wood, such as 2x4s, for the base
3) Something big and heavy, such as a large book, to keep the chessboard standing, if the base you use isn't heavy enough
4) A hammer, for inserting the nails as well as getting small holes started to insert the eye bolts in to
5) Four nails, for setting the inputs as well as making the small holes mentioned above
6) A pair of scissors, for cutting the string and twist ties

Although these are the materials I used, there's not necessarily anything special about them, and you have a lot of flexibility. For example, you could use a piece of plywood instead of the chessboard, or some heavy bolts instead of the physics set weights."
15 Inch Polished Burl Wood Chess Board
15 Inch Polished Burl Wood Chess Board
"This is for mounting everything. You can use any backing you like, so long as you can secure eye bolts into it—for example, plywood should work just fine."
Ajax Scientific Steel 9 Piece Deluxe Hook Weight Set, 10g - 1kg
Ajax Scientific Steel 9 Piece Deluxe Hook Weight Set, 10g - 1kg
"These do all the heavy lifting! You can use any set of weighted objects, for example some heavy bolts. You'll need minimum one light weight, two medium weights, and one heavy weight to build all of the logic gates. They do need to be significantly different in order for the gates to function, though they don't need to be any exact weights in particular."
Crown Bolt 62549 Number 10 Zinc Plated Screw Eye, Silver, 8-Pack
Crown Bolt 62549 Number 10 Zinc Plated Screw Eye, Silver, 8-Pack
"These are for hanging the strings. It's important to use eye bolts instead of hooks, so that the strings don't slide off when they're not taught. However, it's also convenient to use eye bolts with small slits so that the strings can be slipped in and out when assembling and disassembling."
MARSHALLTOWN The Premier Line ML339 Mason's Line 500-Foot Fluorescent Yellow Braided Nylon
MARSHALLTOWN The Premier Line ML339 Mason's Line 500-Foot Fluorescent Yellow Braided Nylon
"This is for hanging the weights. You can use any string you like, so long as the friction doesn't prevent it from sliding."
100pcs Plastic twist ties, 5", Black
100pcs Plastic twist ties, 5", Black
"These are for securing the weights to the strings. You could also tie the strings, but you might have a harder time getting the lengths exact, which is important."
SRM Stickers We've Got Your Number, Large, Black
SRM Stickers We've Got Your Number, Large, Black
"These are for indicating the input and output values. You could also just write directly on the chessboard."
L Shape Metal Corner Brace Right Angle Bracket 65mm x 65mm
L Shape Metal Corner Brace Right Angle Bracket 65mm x 65mm
"These are for securing the back of the chessboard to a solid platform, so that it stands up."