looks nice and tidy how do you calculate the teeth to match the tyre holes is there some formula to work it out been doing my head in dont want to waste anything if there is quick calculation to work them out starting from tire diameter size any info would be much appreciated
@@haugstule So insightful lol. @AnotherTrucking So what I did is read into the parts of a roller/bicycle chain. With chains, they use "pitch" and "roller diameter" to determine which gears or "sprockets" go with which chains. There's also roller width, pin width, etc but they're not that relative to a tire and cog track system. Pins hold the chain plates together. They're the centers of each link. Rollers are what sit in between the teeth of the sprocket. They actually "roll" over a pin. But they greatly increase the lifespan of a chain by keeping the sprocket from wearing down on the chain link pins. Pitch is the distance between 2 rollers centers/pins. its also the space between the points of the teeth on a sprocket. You need the inner circumference of the car tire you want to use. Once you have this, find a nice even number to divide the the circumference by for the pitch of your sprocket (this will also be the distance between the center of each hole). After you have this, cut your holes (circle or squares) out of your tire. The sprocket/cog is the hardest part. If it's aluminum, an "angle grinder" is just going to melt and push the aluminum around and make a huge mess. Use the same saw you'd use for wood. Either circular saw, or miter, or reciprocating, or ban saw... You get the point. Any of these will cut through aluminum like butter, and won't really wear your blade out. An alternative to cutting it out of aluminum... is casting it. Melt down a bunch of aluminum cans, and pour it into a foam mold. RU-vid "lost foam casting". You'll make a product out of foam (or 3d print then => foam). You'll pack it into sand. Then pour the melted aluminum into it. This will give you a really beefy sprocket or cog to spin your tire with :D
