CHISEL
QUESTIONS
1. What material(s) are chisels commonly made from?
A. High carbon steel
B. Chrome vanadium steel
C. Both A & B
D. None of the above.
2. What is the purpose of a half-round nose chisel?
A. Cutting key ways
B. Removing excess metal from welded joints
C. Cutting curved grooves
D. Separating metals after chain drilling
3. What is the purpose of "crowning" on the cutting edge of a chisel?
A. To make it more aesthetically pleasing
B. To prevent rust
C. To prevent digging of corners and breakage
D. To increase cutting efficiency
4. What angle does the clearance angle refer to?
A. The angle between the top face of the cutting point and the work surface
B. The angle between the bottom face of the point and the tangent to the work surface
C. The angle between the cutting edge and the workpiece
D. The angle between the chisel and the hammer
5. What happens if the clearance angle is too low or zero?
A. The chisel will slip
B. The cutting edge digs in
C. The cut will become deeper
D. The chisel becomes blunt
6. Which type of chisel is used for cutting key ways and grooves?
A. Half-round nose chisel
B. Diamond point chisel
C. Cross-cut chisel
D. Web chisel
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7. What can happen if the clearance angle is too great?
A. The chisel will slip
B. The cutting edge cannot penetrate into the work
C. The cut will become deeper and deeper
D. The chisel becomes blunt
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ANSWER AND EXPLANATION
1. C
• Chisels are commonly made from high carbon steel or chrome vanadium steel.
• These materials are chosen for their durability and ability to withstand the forces
involved in chipping and cutting operations.
2. C
• The purpose of a half-round nose chisel is to cut curved grooves, such as oil grooves.
• This type of chisel is specifically designed for shaping and carving curved surfaces.
3. C
• "Crowning" refers to the slight curvature ground onto the cutting edge of a chisel.
• Its purpose is to prevent digging of corners, which could lead to breakage of the
chisel point.
• This curvature allows the chisel to move freely along a straight line while chipping,
enhancing its durability and effectiveness.
4. B
• The clearance angle refers to the angle between the bottom face of the chisel point
and the tangent to the work surface originating at the cutting edge.
• This angle affects the cutting performance of the chisel, influencing how well the
cutting edge penetrates into the workpiece.
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5. A
If the clearance angle is too low or zero, the rake angle increases, and the cutting edge
cannot effectively penetrate into the workpiece. As a result, the chisel tends to slip rather
than cut efficiently.
6. C
Cross-cut chisels are specifically designed for cutting key ways, grooves, and slots. They are
characterized by their shape, which allows for precise cutting of these features in various
materials.
7. C
If the clearance angle is too great, the rake angle reduces. The cutting edge digs in and the
cut will become deeper and deeper.
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