measuring wheel metric

thingiverse

This is a precision measuring wheel. The gear with the arrow spins precisely once every 100 meters. The circumference of the wheel measures half a meter, which requires accurate scaling to function properly. To assemble this device, you will need: 1. One M4 bolt, 50mm or longer 2. One M4 bolt, 35mm or longer (flat countersunk head) - This is necessary due to the design shown in the third image above 3. Two M4 nuts and two washers Note that the gear with the triangle rotates once every 10 meters; however, its visibility may be obstructed by the cover. To aid visibility, I drew over the numbers on this gear using a marker. To create this device, you will need to print one of each part, and the gears should be arranged as depicted in the images below.