1. The two cog wheels engaged and the machine started.

2. When the large cog wheel engages , the mill stone will start to go round.

3. Although John thinks he has an important job , he is really only a cog wheel.

4. He thinks he's a big wheel in political circles, but actually he's a small cog wheel.

5. From this technique and the relation to an old cog wheel, the test was called a cog ging test.

6. Depending on the requirements of the control system, the number of teeth on the cog wheel is defined to allow a resolution of approximately one pulse per degree of crankshaft revolution.