Algodoo

I'm interested in how you make one tooth blue, skip one, repeat...

This is how I think you would make a large C-Gear:

Make one circle tooth with axles at the 3:00 and 9:00 position. In its OnCollide event put "If this color is blue then other color is red else this color is red". Use this circle with two axles as a chain. Wrap the chain around a big circle. Give the big circle some attraction. Remove gravity. Ungroup the chain. Remove hinges from chain. Make circle teeth collide until they are all alternating colors. Select one circle tooth. Select alike. Alter collidewater property. Select all circle teeth plus big circle and group together.

There must be an easier way. Please inform me.

P.S. Another way would be to modify the small gear to set the properties of the big gear teeth.

I do not use a chain, or scripts in the teeth. I could upload a scene to show you easily, but I'll try to explain it in words.

To make a gear, I first figure out how many teeth I want. Let's say 20. Get a circle, copy it untill you have 20, and there are your teeth. They can be any color or density at this point, as long as they're all the same color, density, friction, etc.. Now make a slightly large circle that you think could fit your teeth. Turn off gravity, add a center axle to your large circle, and give it around 50 attraction (depends on your sim.frequency, at like 1000 you can have 100 attraction).

Okay, now comes the first pain in the tookus. When all the circles are on the big circle, see how they're spaced out. If they're all over the place with a bunch of gaps in between them, scale the circle down a bit. If they're stacked all over each other, scale the circle up a bit. Keep scaling and looking at the gear teeth circles, and it really helps to have the red collision lines on. It helps because you can tell when the circles are all touching each other. When they're all touching each other, and when they all stop moving (well, they won't really STOP, they'll just slow their movements by a lot).

When they're stopped, glue all of the circles, the teeth, the large circle, all of it, together. Then you have a c-gear blank.

Now's the really big pain in the tookus, because a lot can go wrong if you don't know what you're doing (I didn't know what I was doing when I made this gear, I just improvised as I was building it). Now you need to have a box with a laser on it, with an axle where the gear blank's axle is. The laser needs to only collide with collision group b, the box need to collide with nothing, and the scripts for the laser need to be:

(e)=>{
e.geom.collideset = 0;
e.geom.controlleracc = e.laser.maxrays;
e.laser.maxrays = e.laser.maxrays - 1
}

Now have the gear blank's gear teeth collide with group b, and have the box with the laser rotate around the gear. of course, the laser has to point at the teeth. Durr.

Once it makes a full revolution, stop the box where you started it, and pause the simulation. Now the script needs to be changed to:

(e)=>{
e.geom.controlleracc == e.laser.maxrays ? {
e.laser.maxrays = e.laser.maxrays + 2;
e.geom.color = [0, 0, 1, 1];
e.geom.collideset = 0
} : {}
}

Make that revolve around the gear the same way it revolved before, and make the teeth collide with b again. Now every other gear should turn blue. When the laser has make a full revolution, get rid of the laser setup, change the collidesets of the blue teeth to A, collides with water and no self collision, and change the other gears to A, doesn't collide with water and no self collision.

Now you have a completed 20 tooth C-Gear!

But remember this: Using the laser thing is only worth it if you use a very large amount of teeth, like 200 or 300. If you're making a gear with 50 teeth, just change the colors of the gear manually.

Now, hopefully, you know how I make giant C-Gears. If you don't quite understand, then please do not hesitate to ask for a description as a scene. It'd probably be easier to understand, and more fun to make than typing.

There might be gaps in the description of how to make a C-gear, you know, the one you just read, but I'm sleepy right now and distracted by Gabriel Iglesias. Man, he's just so gosh darn funny. Tell me if there are any gaps or parts that don't make sense, and I'll correct them (or just make a scene showing you how to make a gear(please choose that one)).

Are you completely insane? That's how you make a C-Gear? Just use Kilinich's C-Gear generator and you can make any gear you want perfectly.

@Dare,

I'm mostly insane, but not completely. Kilinich's C-Gear generator has an upper limit of 94 teeth. Maybe changing the limit to 400 would work. Didn't try it yet.

P.S. Tried it. Didn't work. Causes Stack Overflow.

@FruitMonger,

Thanks for the explanation. It's a long story, but I like it.

I needed a 96 tooth Cgear for a project and I was too dumb to figgure out how
to change Kilinich's wonderfull gear generator to allow it

You could also just copy the teeth and rotate them x degrees depending on how many teeth you want. So if you wanted 360 teeth, you'd rotate each tooth by one degree around the gear each time you copied one. Just get a calculator (or your own brain) and figure out what <amount of teeth> is divided by 360.