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It does not bind because the track drive lugs are further apart than the drivers drive lugs. If you do the math; (assuming 3" pitch, and 7 tooth driver) circumference should be = to 21" which is a diameter of 6.6845", if you shave that 1/8" it becomes 6.5595" which is now a circumference of 20.6073". So the driveshaft is slipping 0.3927" per revolution. which will wear out both your track and the driver faster as well as pissing away HP and efficiency. FWIW
That comes out to a 1.87% change. do you think there is 2% clearance built into the driver system? Or do you think the track and drivers are built with no tolerance allowed? Eric
Cats drivers,(actual measurements)
7 tooth 21" circumference = 3" pitch
8 tooth 22.9" circumference = 2.86" pitch
If the distance of tooth centers can change from 3" to 2.86" with out a problem then i think 1/8" off the 7" drivers will be fine. I think that will result in 2.94" pitch
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Your drivers maybe perfect but how do you know your track is perfect?
Loudhandle did you build your own drop and roll for 9 tooth drivers??
Other than by doing so you are forcing a certain amount of slippage between the track and driver as it tries to grab the next drive lugs. It works but is not right. Most of Avid's drivers are designed the same way, That is why I will not use them. I don't care for lost motion, wasted energy, and accelerating the wear on both parts.
Are there any other choices than Avids for some applications. My 12 it looks like my only choice is Avids. Unless I spend a pile of money.