If you are using our
Belt Calc, the calculator will run any time a value changes or when you press enter. Entry boxes that are white are user edited material. Greyed out boxes are what the calculator returns. The calculator runs in default 5mm HTD pitch.
To use, first select the two pulley sizes. The dropdown features all VEXpro pulley sizes, and by selecting other, you can manually enter your own size. In your case, you would need to enter 36 for each pulley, which is a standard VEXpro pulley.
Next, enter your desired center distance. In your case this would be 9.843". The calculator will try to find the nearest VEXpro belt sizes above and below this number.
Next, you can choose to edit the center distance tolerance with the Center Add box. This manually adds distance to the center distance to adjust belt tightness. The default +.001 works well in most cases. YMMV
The calculator then outputs numbers for the two nearest belt sizes, Smaller and Larger, than the desired center distance.
# of Teeth is the number of the teeth in the belt.
Center Distance is the exact center distance for the pulley+belt combo, plus the center tolerance.
P1 Teeth in Mesh is the number of teeth on Pulley 1 that are in the belt mesh. This number is useful when you have a very large and very small pulley on the same belt. Too few teeth in the mesh can result in belt slippage. For your case, this number can be usually be ignored.
P2 Teeth is the same thing as above but for the second pulley.
The calc says that you could use either a 130 or 140 tooth belt, which would have a center distance of 9.2529 or 10.2372 respectively.
Let me know if you have any more questions