DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 26, Problem 24RQ
What is a peck-drilling subroutine for a CNC machine?
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6/85 In a study of head injury against the instrument panel of a car during sudden or crash stops where
lap belts without shoulder straps or airbags are used, the segmented human model shown in the figure is
analyzed. The hip joint O is assumed to remain fixed relative to the car, and the torso above the hip is
treated as a rigid body of mass m freely pivoted at O. The center of mass of the torso is at G with the initial
position of OG taken as vertical. The radius of gyration of the torso about O is ko. If the car is brought to a
sudden stop with a constant deceleration a, determine the speed v relative to the car with which the
model's head strikes the instrument panel. Substitute the values m = 50 kg, 7 = 450 mm, r = 800 mm, ko
= 550 mm, 0 = 45°, and a = 10g and compute v.
Answer
v = 11.73 m/s
PROBLEM 6/85
Using AutoCAD
340 lb
340 lb
Δ
Chapter 26 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 26 - What human attribute is replaced by a CNC machine?Ch. 26 - Give an everyday example of a household device or...Ch. 26 - Explain how a toaster could be made a closed-loop...Ch. 26 - Prob. 4RQCh. 26 - Prob. 5RQCh. 26 - Prob. 6RQCh. 26 - What kind of operations on a milling machine...Ch. 26 - How is a machining center different from a milling...Ch. 26 - Prob. 9RQCh. 26 - Many manufacturers have purchased large machining...
Ch. 26 - Why was it necessary for machine tool builders to...Ch. 26 - Prob. 12RQCh. 26 - Prob. 13RQCh. 26 - Some of the functions performed by the operator in...Ch. 26 - Prob. 15RQCh. 26 - Prob. 16RQCh. 26 - Prob. 17RQCh. 26 - Prob. 18RQCh. 26 - Prob. 19RQCh. 26 - Prob. 20RQCh. 26 - Prob. 21RQCh. 26 - What is an encoder?Ch. 26 - What does a post processor do?Ch. 26 - What is a peck-drilling subroutine for a CNC...Ch. 26 - What is pocket milling, and what kind of milling...Ch. 26 - How are touch probes used in CNC machines to...Ch. 26 - What are G words used for in CNC?Ch. 26 - What major structural changes are introduced into...Ch. 26 - What process steps are eliminated by the UHSMC in...Ch. 26 - Draw a large circle and imagine you are (the tool)...Ch. 26 - Prob. 1P
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