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172 Masterpiece 4 • PneumADDic II
AND Gate Step 8

The OR Handles

There are two differences between the OR Gate and the AND Gate sub-assemblies.

■ One difference between the OR Gate sub-assembly and the AND Gate sub-
assembly is the distance between the pneumatic switch and the far end of the
Piston sub-assembly.
■ A second difference is the type of handle used to control the pneumatic switch.

In the OR Gate sub-assembly, the pistons expand beyond the pneumatic switch; this
is accomplished by the OR Handle sub-assembly.The OR Handle sub-assembly also uses
rubber bands and the rounded liftarm parts to guide the pistons back to the proper loca-
tion when the pistons contract. PneumADDic II incorporates three OR gates, so you will
need to build three OR Handle sub-assemblies.