Building Robots With Lego Mindstorms

Playing with Gears • Chapter 2 27

The 8t, 24t, and 40t have a radius of 0.5 studs, 1.5 studs, and 2.5 studs, respec-

tively (measured from center to half the tooth length).The distance between the

gears’ axles when placing them is the sum of their radii, so it’s easy to see that

those three gears make very good combinations at distances corresponding to

whole numbers. 8t to 24t is 2 studs, 8t to 40t is 3 studs, and 24t to 40t equates to

four studs.The pairs that match at an even distance are very easy to connect one

above the other in our standard grid, because we know it goes by increments of

two studs for every layer (Figure 2.7).

Another very common ...