Answered: A twin-spindle drill simultaneously…

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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Question

A twin-spindle drill simultaneously drills one ½-in hole and one
¾" through a 1" wide work piece. Both holes are
twist drill with 118° point angles. cutting speed for
material is 230 ft/min. The rotation speed of each spindle can
be configured individually. The feed rate of both holes
must be set to the same value, since both spindles go down at the same
speed. The forward speed is set in such a way that the speed
total metal removal does not exceed 1.50 in3
/min. Determine: a) the velocity
maximum feedrate (in/min) that can be used, b) the individual feedrates
(in/rev) that result in each hole and c) the time required to drill the
holes.

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