(15 pts) 1. A stainless steel bar with an outside diameter of 5.75 in., an insid
ID: 2997416 • Letter: #
Question
(15 pts) 1. A stainless steel bar with an outside diameter of 5.75 in., an inside diameter of 2.25 in. and a length of 4.75 in. must be machined to the following specifications: 5.000 +0.000/-0.001 in. O.D., 2.750 +0.001/-0.000 in. I.D. and 4.375 +/- 0.005 in. long. The work must be accomplished on a CNC lathe with constant cutting speed capability. The facing and turning, and boring tools allow a maximum depth of cut of 0.125 in. with this material. Also, the recommended cutting speed is 300 sfpm and the feedrate is 0.012 ipr for all operations. Calculate: a. Machining time for facinig (each individual cut plus the total) b. Machining time for turning (each individual cut plus the total)Explanation / Answer
(a)
F=feedrate in inches per revolution
R1=starting radius in inches (larger radius)
R2=ending radius in inches (smaller radius)
CSS=constant surface speed in feet per minute
PI=PI
total time in minutes = (PI / ( F X CSS X 12)) X (R1 ^ 2 - R2 ^2)
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