Are you sure the 15mm isn't big enough? We have a Schelling beam saw that uses GT2 belts for the saw blades. The main blade I think uses a 25mm belt, but it's something like a 15hp motor. I believe the scoring blade uses only a12 to15mm belt, and it's still at least a 2hp motor. These belts are pretty strong. sdp will send you a free catalog with a lot of info on GT2 belts and applications.
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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