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Manufacturing and Production: Part 24
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Tool life

## Ashish Futtan is teaching live on Unacademy Plus

Ashish Futtan
MTECH IIT Bombay|Quora Top Writer for GATE Mechanical 2019|Cracked IIT (ISM) Dhanbad,IIT DELHI|3 times GATE qualified| Singer|

U
completely understand..... thanks mam
1. 1 manufacturing and production

2. HELLO! l am ASHISH FUTTAN MTECH-IT BOMBAY TOP STAR EDUCATOR VERIFIED EDUCATOR CRACKED VARIOUS IITs 3 TIMES GATE QUALIFIED PUBLISHED MORE THAN 600 LESSONS

3. IES 2008 What are the reasons for reduction of tool life in a machining operation? 1. Temperature rise of cutting edge 2. Chipping of tool edge due to mechanical impact 3. Gradual wears at tool point 4. Increase in feed of cut at constant cutting force Select the correct answer using the code given below: (a) 1, 2 and 3 (b) 2, 3 and 4 (c) 1, 3 and 4 (d) 1, 2 and 4

4. IAS - 1995 Assertion (A): An increase in depth of cut shortens the tool life. Reason(R): Increases in depth of cut gives rise to relatively small increase in tool temperature. (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true

5. IAS - 2003 The tool life curves for two tools A and B are shown in the figure and they follow the tool life equation VT-C. Consider the following statements: 1. Value of n for both the tools is same. 2. Value of C for both the tools is same. 3. Value of C for tool A will be greater than that for the tool B. 4. Value of C for tool B will be greater than that for the tool A. Which of these statements is/are correct? (a) 1 and 3 (b) 1 and 4 (c) 2 only (d) 4 only Gutting speed

6. IES-1996 Chip equivalent is increased by (a)An increases in side-cutting edge angle of tool (b) An increase in nose radius and side cutting edge angle of tool (c) Increasing the plant area of cut (d) Increasing the depth of cut.

7. IAS - 2007 Contd... A diagram related to machining economics with various cost components is given above. Match List I (Cost Element) with List lI (Appropriate Curve) and select the correct answer using the code given below the Lists: List I List Il (Cost Element) (Appropriate Curve) A. Machining cost 1. Curve-l B. Tool cost 2. Curve-2 C. Tool grinding cost 3. Curve-3 D. Non-productive cost 4. Curve-4 5. Curve-5

8. From previous slide Cost per piece Cutting speed Code:A B C D A B C D (a) 3 2 4 5 (b)4 1 3 2 (c) 3 1 4 2 (d) 4 2 3 5

9. IES 2011 The optimum cutting speed is one which should have: 1, High metal removal rate 2. High cutting tool life 3. Balance the metal removal rate and cutting tool life (a) 1, 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 3 only

10. IES 1999 Consider the following approaches normally applied for the economic analysis of machining: 1. Maximum production rate 2. Maximum profit criterion 3. Minimum cost criterion The correct sequence in ascending order of optimum cutting speed obtained by these approaches is