jk1 wrote:What would be the smallest pulley teeth count you could use on the gates 8mm pitch carbon drive belts ? this is for a mid drive on the motor side.
In the data sheet i think 22teeth is the minimum, if i made a custom drive sprocket would it work for say an 16 or 18 teeth cog on the motor ? or would it slip, I am thinking of using the 10mm wide CARBON POLYCHAIN FOR a 3 to 4 kw motor would that work for such a small motor pulley ? would i have to use idler to increase the belt wrap ?
I have been using 15T 8M PowerGrip GT2 Belt on my setup for over 400 miles with no issues. The sprocket was cut by me too. The carbon belts might not be quite as happy with that tight radius though. They are much more stiff belts in contrast to the powergrips, like plastic verses rubber.
From I understand the key number is teeth in mesh. From the documentation I have read you need at least 6 teeth in mesh to have 100% of the torque rating. Which actually is really easy to do. I talked with gates for a while the one day and they told me the problem with lower than 22t stuff is accelerated belt wear. The fibers are bending further than they were designed to do. While a belt my last a lifetime in perfect conditions with a 22T unit it may only last a season or 1000 miles on 15T or 16T. Basically go with the largest you can get on your driver.
PFEIFER INDUSTRIES makes custom belt drive stuff and are great to talk with. There product are top notch, use them if you can. The reason I say this is they have a really nice calculator that will give teeth in mesh and other handy stuff. I have attached it.