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

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter5: Turning

Section5.3: Machining Operations On The Lathe

Problem 5RQ: Calculate spindle RPM and machining time for cutting a 1.5" diameter 4" long at 225 SFPM using a...

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Concept explainers

Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.

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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