To calculate the belt motor drive ratio, divide the number of teeth on the large pulley (wheel pulley) by the number of teeth on the small pulley (motor pulley). For instance, a 45T large pulley and a 15T small pulley yield a ratio of 3.0 (45T ÷ 15T), while a 40T large pulley and a 15T small pulley give a ratio of 2.7 (40T ÷ 15T).
If you're unsure of your board's pulley sizes, count the teeth on each pulley. For example, a 45T pulley has 45 teeth.
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