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Re: 9 mm Wide Belts
For avoiding belt slippage, HTD is the way to go. I've had mixed experience running 9mm. A long time ago, we made our own pulleys (around 20t) out of aluminum, and we had the center to center distance very accurate, and it worked very well. Later, using an off the shelf pulley and a not as super rigid frame with a not super accurate (but still within 0.002") center to center, we experience some slip.
I'd go with the 15mm if possible. If you can't, you'll survive with 9mm, but you could have some slipping. Slipping isn't that bad (apart from belt wear).
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