A pre-drilled hole of 010 mm in a block of 40 mm thick is required to be enlarged to O 16mm by core drilling process as shown in the figure below. The recommended cutting speed and the feed rate are 25 m/min. and 0.2 mm/rev respectively. The specific energy of block material is 4.0 W-s/mm³.Calculate the following a) Material removal rate (mm3/s) b) Power required for machining (W). c) Time required for machining. (Sec.) d) Total material removed (mm³) e) If the HSS core drill bit used obey the Taylor's tool life equation VT0.14 = 35 (m/min), how many holes the bit can enlarge before it is replaced? f) Is the above drilling operation can be done on an available drill press of 500 watts power with 80% efficiency? Check and show with calculation.

A pre-drilled hole of 010 mm in a block of 40 mm thick is required to be enlarged to O 16mm by core drilling process as shown in the figure below. The recommended cutting speed and the feed rate are 25 m/min. and 0.2 mm/rev respectively. The specific energy of block material is 4.0 W-s/mm³.Calculate the following a) Material removal rate (mm3/s) b) Power required for machining (W). c) Time required for machining. (Sec.) d) Total material removed (mm³) e) If the HSS core drill bit used obey the Taylor's tool life equation VT0.14 = 35 (m/min), how many holes the bit can enlarge before it is replaced? f) Is the above drilling operation can be done on an available drill press of 500 watts power with 80% efficiency? Check and show with calculation.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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