Question
Download Solution PDFTwist drills are made up which of the following materials?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Drilling is the production of cylindrical holes of definite diameters in workpieces by using a multi-point cutting tool called a drill.
- Various cutting tools are available for drilling, but the most common is the twist drill.
- Almost all drilling operation is done using a twist drill. It is called a twist drill as it has two or more spiral or helical flutes formed along its length. The two basic types of twist drills are, parallel shank and taper shank twist drills are available below 13 mm size.
- The various parts of a drill can be identified from the figure:
- Materials used to make drill bits:
- Carbon Steel
- High-Speed Steel (HSS)
- Cobalt Steel
- Tool Steel with Carbide Tips
- Commonly twist drills are made up of HSS.
- HSS bits are hard and much more resistant to heat than high-carbon steel.
- They can be used to drill metal, hardwood, and most other materials at greater cutting speeds than carbon-steel drill bits.
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