Question
Download Solution PDFWhat should be the included angle of the cutting tool used for machining metric threads in a thread-cutting operation?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Metric Thread:
The Bureau of Indian Standards has adopted a unified screw thread profile based on the metric system as the standard thread profile for use in India and designated it as the Metric Screw Thread.
- It also recommends the pitch of the thread instead of threads per inch as one of the standard parameters in specifying a screw thread.
- Metric threads are specified in a drawing by the letter M followed by the nominal size (Basic Major Diameter) and pitch. both expressed in millimetres.
- The included angle of the cutting tool used for machining metric threads in a thread-cutting operation is 60°.
For example a 20 mm diameter 1.25 mm pitch fine screw thread is expressed as M20 × 1.25.
A 20 mm diameter 1.5 pitch a count screw thread is expressed as M20.
- It is customary not to mention the pitch of a coarse thread.
- If thread length is required to be specified it is added after the pitch and an x is used to separate the length of the thread from the rest of the designation.
For example M10 × 1.25 × 25 indicates a thread length of 25 mm.
Last updated on Jun 7, 2025
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