Algodoo

Is this necessary? I guess it's pretty easy to make, but it'll confuse the hell out of people. plus i think one of the gears need to be rotated or the spur teeth will overlap. Let me try...

I'll add it as a third, "Hybrid" mode or something on those lines

alright i just found a rather huge flaw in the c-gear code. But I've been able to spawn one of these somehow

Q: Is this necessary?
A: No, but I found out that circle gears are about 10X stronger than spur gears. So if you are looking for something that is strong and looks realistic, then circle spur gears are the answer. If you are not worried about strength, then it is probably better to use spur gears since they use less processor time than circle gears.

S: It'll confuse the hell out of people.
R: Probably most people, bust most spawn engine designers will be able to grasp the concept.

S: Plus I think one of the gears need to be rotated or the spur teeth will overlap.
R: Yes, that's the tricky part from a gear generation, GUI, and user understanding point of view. You could spawn two meshed gears at once or have two types of gears, an A type and a B type, where A always has to mesh with a B. Another tricky part is to get the pitch circles for the spur and circle gears equal. The simplest approach may be to add the circle gear "teeth" to a spur gear.

s_noonan - Your spur gears are SO QUIET. In fact I can't hear them at all while turning. Good job!

Well, I've been able to spawn them without too much hassle (For the external gears, that is. The internal c-gears are broken [if you could help me on how to make better ones, please do] and the rack gears are in progress).
I basically adapted the c-gear script to use the pitch radius as an initial variable, then i simply used the same formula that you use to calculate the pitch circle on the spur gears. There are two overlapped pitch circles, but it's not much of a problem.

The problem came with the spur gear angle. I found out that the problem was much simpler than expected: if the side of the spur gear tooth touched the c-gear tooth center, you could spawn any other hybrid gear (i call them that for now, since i'll probably enable collisions for both) made with the same concept, and they would mesh perfectly.
So, on with the formula needed for this: The tooth profile changes so much from a 4-tooth to a 30-tooth that the angle needed to keep the spur tooth to the c-gear tooth center was "almost" linear.
So, on to making a function that gives me those angle values for each Z0. I ended up making a cubic function with regression, but it's only good up to 30 teeth gears. good enough for now

So, I want to improve internal c-gears before adding the transparent spur gear upon it. It's already working, but my internal gears are flawed. Could you help me with that? i'm looking for an internal c-gear profile that has as much contact as possible with any tooth count. if you can at least make a scene with the concept, i'll add it into the generator

I got your message. I will look into it.

Statement: I'm looking for an internal c-gear profile that has as much contact as possible with any tooth count.
Response: I don't believe this is possible since a design that is optimal for one internal/external gear combination does not apply if the spur gear tooth count is changed.

I like your solution for the hybrid gear. The approach you used never crossed my mind.