Build Your Own Combat Robot

108 Build Your Own Combat Robot
FIGURE 6-2
Schematic of a
double speed
reduction system.
the gear reduction shown in Figure 6-2. The D 1 / D 2 is the first gear reduction ratio,
and D 3 / D 4 is the second gear reduction ratio.
In the previous example, you looked at a speed reduction of 10. With the double-speed
reduction system, you have a lot of options for choosing gear diameters.
The product of the first and second stages in the speed reducer must be 10. For example,
you can choose the first gear reduction to be 4 and the second gear reduction
to be 2.5. In this case, you can use the same 1.5-inch-diameter gear on the motor
shaft, and then the second gear should be 6 inches in diameter. This is smaller than
the 10-inch-diameter wheels used in this example. The third gear could be a
2-inch-diameter gear, which would mean that the last gear should be 2.5 times
larger or 5 inches in diameter. These gear sizes are much more manageable than
trying to do this entire gear reduction in one step.
6.4
6.5
6.6