0 0 votes A hole of $20$ $mm$ diameter is to be drilled in a steel block of $40$ $mm$ thickness. The drilling is performed at rotational speed of $400$ $rpm$ and feed rate of $0.1$ $mm/rev$. The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is $1.00$ $1.25$ $1.50$ $1.75$ Materials, Manufacturing and Industrial Engineering gateme-2014-set2 materials-manufacturing-and-industrial-engineering machining-and-machine-tools-operations + – ♦Arjun 311 views answer comment Share Follow Add Sync Questions 0 reply Please log in or register to add a comment.
