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Questions and Answers
What is the primary material used for making twist drills?
What is the main purpose of a center punch in drilling?
What type of cutting tools are used in the boring process?
What are the three principal parts of a twist drill?
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What is the initial step before making a circular hole by drilling?
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Study Notes
Twist Drills
- High-speed steel (HSS) is the primary material used for making twist drills, known for its durability and ability to retain sharpness at high temperatures.
- Carbide is another common material, providing improved hardness and wear resistance compared to HSS.
Center Punch Purpose
- The main purpose of a center punch is to create a small indentation on the workpiece surface, preventing the drill bit from wandering during the drilling process.
- This ensures accuracy in the placement of the hole.
Boring Cutting Tools
- Boring processes utilize various types of cutting tools, including boring bars, which can be single-point or multi-point tools.
- Boring heads are often employed for fine adjustments and precision work.
Principal Parts of a Twist Drill
- A twist drill consists of three principal parts:
- The shank, which is the part that fits into the drill chuck.
- The body, which includes the flutes and provides the cutting edges.
- The tip, which is the cutting part that makes contact with the material.
Initial Step for Drilling
- The initial step before creating a circular hole is to mark the drilling location accurately, usually facilitated by using a center punch to ensure the drill bit will start at the precise spot.
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Description
Test your knowledge of drilling operations, the difference between drilling and boring, the geometry of drilling tools, types of drilling machines, and methods of holding tools. Learn about the various operations conducted on drilling machines.
