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I built a laser spirograph and am wondering if anybody can help with the mathematics behind it? Spirograph -- from Wolfram MathWorld The above link shows hypotrochoids, which are generated by a fixed point on a circle rolling inside a fixed circle. The various diagrams are exactly what my...

Hi, I previously built a laser Spirograph with 1 inch circular mirrors hot glued to the motor shaft. I heard some people used computer fans but they will not spin backwards, not giving me all of the possible shape types! Any suggestions on ideas of motor/mirror combination? I want to move...

I have a red, green, and blue laser, and now its time to combine and make a bunch of colors. I found this on electronic goldmine on sale cyber monday for 5 bucks. Here I've heard about using those things in old video cameras that split the red, green, and blue, but I don't have any old video...

Lets say I build a white Laser using a green, red, and blue combined using lenses. If this Laser is relatively powerful, and could harm my eyes, how can I protect them? Would I take 2 different glasses and put them on top of each other? Or is there some other way?

I found a laser for 50 dollars on ebay and it says it's 50 milliwatts and 80 milliwatt light power. Heres the link. I want to know how bright it is and how much power I will get. First can I see the beam, second will it pop a balloon and last, will it burn electrical tape? Do I need laser...

I found a 50 milli-watt laser here and I am wondering if it would work for a laser spirograph. Is the beam too thick? Will it pop a balloon?, can you see the beam without fog?

I Built a 3-mirror laser Spirograph a while ago and powered it with a small <5 Milli-watt red Wal-Mart dumb laser pointer. I couldn't use this if there was any bit of light and it had to be very close to where it was being projected. I then got a 15 dollar 50 Milli-watt red laser pointer from...