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130 Masterpiece 3 • The LEGO Turning Machine

■ The Erase Switch sub-assembly (down switch)

■ The Write Switch sub-assembly (up switch)

The Erase Switch sub-assembly pushes the liftarm of a given cell down to the erased
(or empty) position. It converts the rotation of a motor into a plunger movement that
pushes the liftarm of a memory cell on the tape into the erased position.

Erase Switch Step 0

Erase Switch Step 1

Erase Switch Step 2

The use of a double-
holed 1x2 TECHNIC
brick is fundamental
for the correct
placement of the small
pushing arm.