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Describe the main operating features of any one of the following: - Pop riveting gun - Shears - Tailstock. - Leaving Cert Engineering - Question i - 2019
Question i
Describe the main operating features of any one of the following: - Pop riveting gun - Shears - Tailstock.
Worked Solution & Example Answer:Describe the main operating features of any one of the following: - Pop riveting gun - Shears - Tailstock. - Leaving Cert Engineering - Question i - 2019
Step 1
Pop riveting gun
Answer
A pop riveting gun is used to create a pop rivet joint in sheet metal.
- Process: A pop rivet is placed into the gun and passed through a pre-drilled hole in the metals to be joined.
- Operation: As the handles of the gun are squeezed, a clamping mechanism grips the shaft of the rivet and draws it back.
- Rivet Expansion: The enlarged end of the shaft causes the remaining part of the rivet to expand, thereby clamping the sheet metal together.
- Breakage Prevention: If the tensile force on the rivet gets too great, it breaks off, leaving the pop rivet joint behind.
Step 2
Shears
Answer
Shears operate by clamping the material into position.
- Clamping: The material is firmly clamped to prevent any movement.
- Cutting: A moving blade descends and comes down across a fixed blade, applying a shearing action to cut the material.
- Angle Adjustment: For larger sheets, the moving blade can be set on an angle or 'rocked' to shear material progressively from one side to the other; this angle is known as the shear angle.
Step 3
Tailstock
Answer
The tailstock is part of a centre lathe that is movable along the bedway.
- Functionality: It supports drilling, tapping, reaming, or supporting the outer end of long workpieces.
- Adjustability: The tailstock can be moved forward or backward by rotating a handwheel located at the back of the tailstock.
- Clamping: A second lever can be used to clamp the tailstock in any desired position on the bedway.