41.
Match the following:-
| List-I | List-ll |
|---|---|
| A. Chatter | 1. Too high feed |
| B. Poor surface finish | 2. Lack of rigidity in fixtures,bar or workpiece |
| C. Cutter burrs | 3. High cutting load |
| D. Built-up edge formation | 4. Radial relief too great |
| 5. Not enough lubricant |
Exam Year(s)
Northern Coalfields Limited - 2020, NCL Technician - 2020,
Answer: B
The correct matching is A-2, B-1, C-3, D-5.
- Chatter: lack of rigidity in fixtures, bar or workpiece (2), which lets the cutter and work vibrate.
- Poor surface finish: too high a feed (1), which leaves deep feed marks.
- Cutter burrs: a high cutting load (3), which pushes material over the edges instead of shearing it cleanly.
- Built-up edge formation: not enough lubricant (5), so chip material welds onto the tool face.
Chatter is a rigidity fault, which rules out options C and D. Between A and B, built-up edge is the classic result of poor lubrication, which settles it as B. Item 4, too great a radial relief, is the unused distractor.
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