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Drill

The document describes the use of relay logic to control the extension and retraction of a pneumatic cylinder in a drill press. It outlines the sequence of operations starting from the drill at the top position, activating the extend solenoid to move the drill down, and using limit switches to control the motion. The relay logic diagram includes components such as control relays, solenoids, and a motor starter to facilitate the drilling cycle.

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yasmin Elsayed
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14 views1 page

Drill

The document describes the use of relay logic to control the extension and retraction of a pneumatic cylinder in a drill press. It outlines the sequence of operations starting from the drill at the top position, activating the extend solenoid to move the drill down, and using limit switches to control the motion. The relay logic diagram includes components such as control relays, solenoids, and a motor starter to facilitate the drilling cycle.

Uploaded by

yasmin Elsayed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Relay logic can be used to control the extension and retraction of a

pneumatic (air) cylinder. The figure shows a drill press that uses an air
cylinder to move a drill up and down through its drilling cycle.
Initially: The cycle begins with the drill at the top of its stroke. The air
cylinder is retracted and the drill motor is turned off.
When the start button is depressed momentarily, the extend solenoid is
energized and retract solenoid is de-energized so that air is moved to the
air cylinder to make it extend, which causes the drill to move down. The
drill motor is turned on by the drill motor starter during the down stroke.
When the drill is extended to its full down stroke, it will strike a limit
switch that will open and cause the retract solenoid to be de-energized,
and the cylinder retracts moving the drill back to the up position.
REQUIRED:
THE RELAY LOGIC THAT IS USED TO CONTROL THE
EXTENSION AND THE RETRACTION OF THE AIR CYLINDER
TO MOVE A DRILL THROUGH ITS STROKE.
In the relay logic diagram:
- Limit switch LS1 is NO
- Limit switch LS2 is NC
- Three control relays may be used CR1, CR2, CR3
- Two solenoids , Extend SOL and Retract SOL
- One motor starter Drill motor starter.

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