Anyone care to give me a bit of noob education on the differences between common pulley/belt profiles? From what I've found, the GT and AT profiles are better for linear positioning than the HTD and T profiles respectively, but otherwise I'm struggling find more info on "what" the different profiles are good for.

Ultimately, I'm looking at creating a slow/high torque 4th axis for a CNC machine.

My current plan is to drive a 60 Tooth AT5 Pulley from a 20 Tooth AT5; using a 25mm wide belt. The input (on the 20 tooth) would be anything up to 120rpm and 10Nm of torque (so approx 40rpm and 30Nm on the 60 tooth output).

I'm not needing to hold metalworking levels of tolerance (it's a woodworking machine), but obviously I don't want it slipping or snapping belts.

Am I being realistic with the above, should I be looking at a different profile and/or thinner or thicker belt?