Gears, for the most part, are described by the number of teeth they have. A 24t gear, for example, has 24 teeth. (The "t" stands for "teeth.") Figure 2-3 shows a photograph of the various types of

gears that come with the RIS kit.

There are two types of bushings in the RIS kit: regular and half-size. Both fit on shafts and are used for securing a shaft in place or for spacing. Figure 2-4 shows the bushings.

Finally, the term wire brick refers to the part shown in Figure 2-5. This piece is used to make an electrical connection between a sensor or motor and the RCX.

Figure 2-2.

Some beams, plates, and shafts and their lengths

Figure 2-3.

Gears

Figure 2-4.

Full and half-size bushings

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