No, I’m good. Read what @annihil8ted wrote.
Idea is that as well as more evenly distributing wear by mismatching teeth, grease would also be distributed more evenly because teeth with more of it would pass it to teeth with less of it as they interact, and since each tooth on 1 gear interacts with each tooth on the other gear, eventually all excess / lack of grease will disappear.
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Guys, don’t reinvent the gear. There exists software just for the purpose of gear generation. All of my gears are generated and machined using the software. Of course it requires a lot of paremeters and it works very well because the creators of said software are experts in gear machining. I don’t know if the guys in China do it right. Here I am adding example of gear parameters:
Good luck.
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Hold my beer 
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I may be wrong but I think it doesn’t necessarily have to be primes. Primes is probable the best case but as long as your ratios are non integers, the gears should shuffle around and distribute evenly.
#dicksoutforengineering? #dicksoutforstats?
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I can calculate how fun your skateboard is and when you’re about to eat shit 
Seriously though, very interesting insight on long term gear life setups. Conditional thoughts like these are what drive entire systems to be better. I think I like you 
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I don’t mean to be malicious. This is just my general experience/observation.
There always are bad, good and very good manufacturers, using different practices, priced accordingly.
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Oh shit, China REPRESENT.
Just wait til I design my gear drives.
There is a ton of good stuff in there
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Hey, good to see you here i bought the 220 hangers from you a while ago. Didnt use them yet, but they are beautifully made. Plus i didn’t have to pay import taxes, so thanks 
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Sorry, I don’t know why you are so malicious to China. I have never attacked people from other countries in this forum. Products from China are good and bad, but many Chinese companies are working hard to make better things, like exway, backfire, and maker x, elofty, maytech, Dickyho, which make DIY accessories.
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He wasn’t being malicious
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I think most people here know that China makes a ton of stuff available to us, but we’re also waiting for more opportunities to have input about gear developed for esk8. A vendor who handles themselves well can learn a ton about market need in this forum.
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Take a look at the Norton also, Machine Design, the explanations and methodology are easier to follow
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Yes, please don’t be malicious to China.
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No.
This picture shows that every tooth on 1 pulley won’t touch every tooth on the other pulley.
However, you might still think that 15:36 is a good ratio for spreading grease, since maybe excess grease from 1 tooth can still somehow make it’s way to every other tooth. But no!
The tooth count MUST be coprime. The easiest way to realize this, is by seeing that 15 and 36 have a common factor of 3. Let’s paint the teeth on both of our pulleys in 3 different colors, alternating in the same order. (Red, blue, green, red, blue, green, etc.)
It’s pretty easy to visualize that if we first connect the gears so that matching colors touch, it’ll always remain this way. Red teeth on 1 pulley will only touch the red teeth on the other pulley! So grease / imperfections will be balanced evenly within these 3 color groups, but not entirely throughout the system.
Conclusion: the smaller the common factor, the less groups, and the more evenly we distribute wear and grease! And the smallest common factor one can hope for is 1, so a pair of gears with coprime tooth count is preferred 
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I would like to add here that if you want to avoid undercutting of the gears, the minimal number of teeth on the pinion should be 17, would be a good thing to consider for the gearbox makers here.
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This is same in any country. Can have good or bad manufacturing. It not based on country at all. This ignorant.
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