How To Measure A Belt Pulley. It’s this last one that’s a bit tricky and the reason for this article. Put together the part number:
Belt length = 2c + 1.57 x (d1 + d2) + 1” where A tape measure is placed from one side of the circle to the other, making sure that the measuring edge passes through the pulley’s. Multiply the radius by 2 π (pi) and you will have the circumference of the pulley wheel.
Next, determine the diameter of the smaller pulley.
Common widths range from ½ to as wide as 1½ to indicate whether you need anything from an a belt all the way up to an e belt. For example an 80 tooth pulley would have an 8” outside diameter (o.d.) (80 teeth / 10) or a 33 tooth pulley would have a 3.3” outside diameter (o.d.) (33 teeth /. Bl2 pix belt length measuring tool: Apply the following formula to determine a new replacement belt length: