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Use the Gears to Count Movement with Sensors!
Evenly spaced holes near the edge, which can be used with a slotted optocoupler to measure velocity, acceleration or distance of the gear or vehicle. Holes can also be used to attach the gear to a wheel, pulley or other objects.
Gear A has a 9/16" diameter with 13 teeth, Gear B has a 3/4" diameter with 18 teeth, Gear C has a 1-9/16" diameter with 38 teeth and Gear D has a 2-11/32" diameter with 58 teeth. Set includes four center hole inserts to 1/8" and one insert to 2mm.
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