Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 31, Problem 30RQ
What five requirements must be met for gears to operate satisfactorily? Which of these are determined by the manufacturing process?
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Another very common mode of failure of gear teeth is
that due to surface damage or pitting, which can
eventually result in extensive cratering and loss of the
load bearing surface of the tooth. Which of the following
best describes the causes, and some of the measures
that can be taken to prevent this form of failure.
a.
Maximum compressive stresses occur at the root of the
tooth;
- Stress concentrations due to cracks in the tooth flank
can increase these stresses;
- Failure is due to fatigue loading, and is worse because
of shock loads:
-Asperity to asperity contact, and hence high surface
roughness or poor lubrication can make this failure
worse;
- Surface load capacity can be improved by selecting
materials with high surface hardness values, such as
carburised steels;
- Once pitting has occurred over more than 10 % of the
surface, gears are no longer serviceable.
b.
Maximum tensile stresses occur at the point of contact
between the teeth;
- Stress concentrations due to pits or small…
How would I solve part B?
If in a gear design problem, the required hardness of steels per allowable gear bending strength is: HB = 158; while the required hardness of steels per allowable gear contact strength is: HB = 256.
Which material HB hardness will be used for gear material specification?
256
158
120
400
Chapter 31 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 31 - How does the pitch diameter differ from the major...Ch. 31 - Prob. 2RQCh. 31 - Prob. 3RQCh. 31 - Prob. 4RQCh. 31 - Prob. 5RQCh. 31 - Explain the meaning of 14 -20 UNC-3A.Ch. 31 - Prob. 7RQCh. 31 - Prob. 8RQCh. 31 - Prob. 9RQCh. 31 - Prob. 10RQ
Ch. 31 - Prob. 11RQCh. 31 - Prob. 12RQCh. 31 - Prob. 13RQCh. 31 - What is the reason for using a taper tap before a...Ch. 31 - Prob. 15RQCh. 31 - Can a fluteless tap be used for threading a hole...Ch. 31 - What provisions should a designer make so that a...Ch. 31 - What is the major advantage of a spiral-point tap?Ch. 31 - Prob. 19RQCh. 31 - Is it desirable for a tapping fluid to have...Ch. 31 - How does thread milling differ from thread...Ch. 31 - What are the advantages of making threads by...Ch. 31 - Prob. 23RQCh. 31 - Prob. 24RQCh. 31 - What is a fluteless tap?Ch. 31 - Why is the involute form used for gear teeth?Ch. 31 - What is the diametral pitch of a gear?Ch. 31 - What is the relationship between the diametral...Ch. 31 - On a sketch of a gear, indicate the pitch circle,...Ch. 31 - What five requirements must be met for gears to...Ch. 31 - What are the advantages of helical gears compared...Ch. 31 - Prob. 32RQCh. 31 - What difficulty would be encountered in bobbing a...Ch. 31 - What is the only type of machine on which...Ch. 31 - Prob. 35RQCh. 31 - Why arent more gears made by broaching?Ch. 31 - What is the most important property of a crown...Ch. 31 - What are three basic processes for machining...Ch. 31 - Which basic gear-machining process is utilized in...Ch. 31 - When a helical gear is machined on a milling...Ch. 31 - Why is a gear-hobbing machine much more productive...Ch. 31 - Prob. 42RQCh. 31 - What are the advantages of cold-roll forming for...Ch. 31 - Prob. 44RQCh. 31 - Under what conditions should shaving not be used...Ch. 31 - Prob. 46RQCh. 31 - Can lapping be used to finish cast iron gears?Ch. 31 - What factors are usually checked in inspecting...Ch. 31 - What are the basic methods for gear finishing?Ch. 31 - A hob that has a pitch diameter of 76.2 mm is used...Ch. 31 - In Figure 31.17, a form-milling operation and...Ch. 31 - A gear-broaching machine can complete the gear in...Ch. 31 - Prob. 4PCh. 31 - If only three gears described in Problem 4 were to...Ch. 31 - Based on the size and shape of the product,...Ch. 31 - What type of engineering materials might be able...Ch. 31 - Prob. 3CS
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- Question 1 What is the difference between bending stress and pitting resistance? And why is it important to verify the bending stress of the standard selected gearsarrow_forwardDescribe gear and classification of gears and detail also explain terms used in gears?arrow_forwardanswer of these three boxesarrow_forward
- The questions is this: A 5000-lb. gear box is provided with a steel (as rolled B1113) eyebolt for use in moving it. What size bolt should be used: a.if UNC threads are used? b.If UNF threads are used? c.If the 8-thread series is used? and I got the answer in the picture provided. Can you explain further the basis of the choice of the design factor?arrow_forwardQUESTION 3 DETAILED GEARING A gear drive is proposed to connect a 30-KW electric motor, with a shaft speed of 1475 r/min, to a uniformly loaded conveyor with a required shaft speed of approximately 531 r/min. Use a pinion with 18 teeth, a pressure angle of 20. and a gear with 50 teeth. Both gears will be made from hardened through grade 2 steel, while the Brinell hardness of the pinion and gear will be 160 BHN. The gears are b be manufactured to a number 9 AGMA quality standard while the teeth are uncrowned. The module of the gears is 5 mm, and the face width is 20 mm. The gears are straddle mounted within a precision enclosed gear unit. Assume a pinion life of 10° cycles and a reliability of 90 %. 3.1 Determine the AGMA bending stress for the gear and pinion. 3.2 Determine the corresponding factors of safety for both the pinion and the gear. 3.3 Write the conclusion.arrow_forwardi need the answer quicklyarrow_forward
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