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In idealized chip formation, built up edge will break off and remove some of the cutting tool materials, thereby reducing tool life. Which of the following steps prevent built up edge?

         1. Increasing cutting speed

         2. Increasing feed rate

         3. Increasing ambient work – piece temperature

         4. Decreasing rake angle

         5. Reducing friction

         Select the correct answer using the code given below:

         (a) 1, 2 and 3                  (b) 2, 3 and 4

         (c) 1, 3 and 5                  (d) 2, 4 and 5

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