Page 42 - Build a Remote Controlled Robot

FIGURE 1-9. Motorized wheel attachment. THE MOTORIZED PLATFORM 9

THIRD CASTOR WHEEL

The castor wheel makes the platform level and gives it stability.
The wheel should be about 3 inches in diameter and designed
for heavy-duty use. Depending on the wheel you obtain, you’ll
probably have to stack pieces of plywood between the platform
and the mounting plate of the castor wheel so that the plat-
form sits level. Figure 1-10 shows where on the platform the
wheel is mounted. Remember to make sure that the castor is
centered along the front edge of the platform. A guideline
shown in Fig. 1-10 shows how to do this.
After you find the center point, place the castor wheel on
the platform so that if turned in a circle, the wheel will not pro-
trude past the front edge of the platform. Next mark and drill
the hole for the wheel’s mounting plate. (The diameter of the