Preface
MicroLogix 1000 Programmable Controllers User Manual
E–4
Drill Mechanism Operation
When the operator presses the start button, the drill motor turns on. After the book
is in the first drilling position, the conveyor subroutine sets a drill sequence start bit,
and the drill moves toward the book. When the drill has drilled through the book,
the drill body hits a limit switch and causes the drill to retract up out of the book.
When the drill body is fully retracted, the drill body hits another limit switch
indicating that it is in the home position. Hitting the second limit switch unlatches
the drill sequence start bit and causes the conveyor to move the book to the next
drilling position.
Conveyor Operation
When the start button is pressed, the conveyor moves the books forward. As the
first book moves close to the drill, the book trips a photo-eye sensor. This tells the
machine where the leading edge of the book is. Based on the position of the selector
switch, the conveyor moves the book until it reaches the first drilling position. The
drill sequence start bit is set and the first hole is drilled. The drill sequence start bit
is now unlatched and the conveyor moves the same book to the second drilling
position. The drilling process is repeated until there are the desired holes per book.
The machine then looks for another book to break the photo-eye beam and the
process is repeated. The operator can change the number of drilled holes by
changing the selector switch.
Drill Calculation and Warning
The program tracks the number of holes drilled and the number of inches of material
that have been drilled through using a thumbwheel. The thumbwheel is set to the
thickness of the book per 1/4 inch. (If the book is 1 1/2 inches thick, the operator
would set the thumbwheel to 6.) When 25,000 inches have been drilled, the Change
Drill Soon pilot light turns on. When 25,500 inches have been drilled, the Change
Drill Soon pilot light flashes. When 26,000 inches have been drilled, the Change
Drill Now pilot light turns on and the machine turns off. The operator changes drill
bits and then resets the internal drill wear counter by turning the Drill Change Reset
keyswitch.
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