
Becoming Mobile • Chapter 8 147
distance.The gearing in Figure 8.19 makes the wheel rotate in the proper direc-
tion, the one that complies with the turn, while the gearing in Figure 8.20 makes
the wheel oppose the turn.We realize this is a subtle difference, and we invite
you once again to learn by experience, building the two versions by yourself and
verifying how they work.
To build a complete synchro drive, you need at least three of these turntables.
Then you have to connect them so that one motor can drive all the axles at the
same time, while another can turn all the wheels in sync.
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Figure 8.19 A Possible Wheel Assembly for a Synchro ...