Chocolate carving lego pantograph
But it gave me the idea of trying to build something like that out of lego, especially because I recently bought a big lego set for something else.
But crayons are tricky to carve because they aren't flat, and then I had the idea of trying it on chocolate instead. After thinking about it for a while, and figuring out what gearing I needed to spin a cutter fast eno`ugh, I set out to build the pantograph. It took about an hour and a half of tinkering.
No lego part itself was suitable to use a s cutter or "router bit", but I had the idea of breaking off a piece of a scalpel blade and sanding that to just the right width to fit inside a lego shaft coupler. I pressed it in with a pair of pliers (see photo at right)
At right, the result of my first test. I followed some letters I wrote on a piece
of cardboard attached to the pantograph.
It also really helps to lubricate lego shafts and gears to cut down on wear. I used some mineral oil, which is actually meant for human consumption as a laxative. That way I didn't have to worry about trace amounts of it ending up on the chocolate.
More lego stuff:
Building a Lego repeating crossbow (video only)
Lego technic new vs. old (video only)
More about pantographs:
Plasma pantograph for cutting intricate shapes out of metal
Making wooden rings with a pantograph