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A bi-directional, one-digit, base-10 mechanical counter. It is designed such that strings should be attached to the 'ratchet pulling arms' , and a rubber-band should connect both ratchet pulling arms to one another, looping around an m3 bolt protruding from the zero_detect_frame block.
Print out 1 copy of all of the pieces, and two copies of the ratchet_pulling_arms. 693 bearings are used in the string_pulley and in the zero_detect_arm. 623 bearings are used in the ratchet_gear and the front of the zero_detect_arm (the bearing that rolls along the counter wheel). A spring (or rubber band) should be stretched from the hook hanging down from the zero_detect_arm to the same screw the rubber band connecting the pulling arms is wrapped around. A 1/4" diameter spring, about .3" long is used to force the ratchet_detent_arm into place. Liberally apply M3 nuts and bolts to secure everything.
You should be able to increment and decrement the counter by pulling on either one of the strings.
Bi-directional Mechanical Counter by chris is licensed under the Creative Commons - Public Domain Dedication license.
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