ShopReady Draft 3D · 2:12 · narrated, with captions
A two-stage gear reduction, 12 to 1
Four gears are drawn with the Gear tool on one flat drawing, each held at its meshing distance from the last and turned to mesh. They are pulled up gear by gear, two of them on one shaft, and set turning; the flat plan lists each gear's speed and the ratio.
This is one part of a longer film
More in Things that move: gears
Clip · 2:16A gear train standing upright, as a clock's does
A back plate is drawn on the front plane and pulled toward the front. Four gears are drawn on its front face, their shaft holes pulled out into posts and the gears pulled round them on two levels. Set turning, the train moves in its own upright plane, and the flat plan stands upright with it: 9 to 1.
Clip · 3:11A three-stage gear train on a plate, with a crank
A base plate is drawn, pulled up and drilled for its screws. Six gears are drawn on its top face with the Gear tool, each held where it meshes; their shaft holes are pulled up into posts, the gears are pulled round the posts on three levels, and a crank is drawn on the first gear. The Motion tab turns the whole train: 27 turns of the crank for one of the last gear.