Multiple Gearing Model

thingiverse

This is a model of a mechanism I've observed several times previously. The mechanism also appears in the book "Five Hundred and Seven Mechanical Movements." In the book, it's listed as #027 and called "Multiple Gearing." The design was created using OpenSCAD. The OpenSCAD model is parameterized so that the number of arms on the small wheel can be easily changed. I have included SVG files for laser cutting models with 2,3,4,5 and 6 arms. The other parts are common between the designs. There is a YouTube video that contains detailed assembly instructions: https://www.youtube.com/watch?v=bFRtYIas8WU What you will need: For each arm on the small wheel, you will need a 3D print of: <b>multiple_gearing_Print_3D_A.stl</b> You will need a single 3D print of the model: <b>multiple_gearing_Print_3D_B.stl</b> The number of fasteners and bearings required depends on the number of arms in the design. Here is a generic list of the fasteners and bearing sizes. Parts: Small Bearing: 683ZZ: 3mm x 7mm x 3mm Deep Groove Bearing Big Bearing: 608ZZ 8mm x 22mm x 7 mm Deep Groove Ball Bearing Rounded Head Screws for Sheet Metal, #6, 1/4" Long (McMaster Carr Part Number: 90077A144) Rounded Head Screws for Sheet Metal, #6, 3/8" Long (McMaster Carr Part Number: 90077A146) Flat Head Screws M3 x 0.5 mm, 16 mm Long (McMaster Carr Part Number: 91420A126) Wood: 5.2mm - Sande Plywood (1/4 in. Category Common: 1/4 in. x 4 ft. x 8 ft.; Actual: 0.205 in. x 48 in. x 96 in.) (From Home Depot) Tools: 10-24 tap