Gears have backlash period. And if they don;t have backlash out of the box... they increasingly will have it. There's a method of countering that, but it increases wear as it uses tension. I rely on my steel loaded timing belts instead. I use the type made for the car industry. Incredibly strong PU with little steel cables in them. Even exceeding the suggested load max by a factor ten to achieve a guitar string like tension has not resulted in any failures yet. I cannot measure any flex at 160lbs of tension and the speed they can achieve is incredible. Less than 3 bucks per foot is also cheap. Many belts run in Diesel engines as valve timing belts for more than 50,000 miles before they are changed just for good measure. That's a lot of rpm's... and heat... They last forever in our environment. R
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