Machine Tool Practices
11th Edition
ISBN: 9780134985848
Author: Richard R. Kibbe; Roland O. Meyer; Jon Stenerson; Kelly Curran
Publisher: Pearson Education (US)
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Question
Chapter A.8, Problem 9ST
To determine
Symbol of MMC and LMC.
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Please solve this problem as soon as possible My ID# 016948724
The gears shown in the figure have a diametral pitch of 2 teeth per inch and a 20° pressure angle.
The pinion rotates at 1800 rev/min clockwise and transmits 200 hp through the idler pair to gear
5 on shaft c. What forces do gears 3 and 4 transmit to the idler shaft?
TS
I
y
18T
32T
This
a
12
x
18T
C
48T
5
Question 1. Draw 3 teeth for the following pinion and gear respectively. The teeth
should be drawn near the pressure line so that the teeth from the pinion should
mesh those of the gear. Drawing scale (1:1). Either a precise hand drawing or
CAD drawing is acceptable. Draw all the trajectories of the involute lines and the
circles.
Specification: 18tooth pinion and 30tooth gear. Diameter pitch=P=6 teeth /inch.
Pressure angle:20°, 1/P for addendum (a) and 1.25/P for dedendum (b). For fillet,
c=b-a.
Chapter A Solutions
Machine Tool Practices
Ch. A.1 - Prob. 1STCh. A.1 - Prob. 2STCh. A.1 - Companies are looking for people with good...Ch. A.1 - Prob. 4STCh. A.1 - Prob. 5STCh. A.1 - Prob. 6STCh. A.1 - Prob. 7STCh. A.1 - Prob. 8STCh. A.2 - Prob. 1STCh. A.2 - Prob. 2ST
Ch. A.2 - Prob. 3STCh. A.2 - Prob. 4STCh. A.2 - Prob. 5STCh. A.2 - Prob. 6STCh. A.2 - Prob. 7STCh. A.3 - What is the primary piece of safety equipment in...Ch. A.3 - Prob. 2STCh. A.3 - Prob. 3STCh. A.3 - Prob. 4STCh. A.3 - What hazards exist from coolants, oils, and...Ch. A.3 - Prob. 6STCh. A.3 - Prob. 7STCh. A.3 - Prob. 8STCh. A.3 - Prob. 9STCh. A.3 - Prob. 10STCh. A.3 - Prob. 11STCh. A.4 - Define the term pitch diameter.Ch. A.4 - Name two ways to measure a thread.Ch. A.4 - What is the rule of thumb for the length of...Ch. A.4 - Describe when class two fits are used.Ch. A.4 - Describe UNC and UNF.Ch. A.4 - What is the formula for calculating the OD of a...Ch. A.4 - When are stud bolts used?Ch. A.4 - Prob. 8STCh. A.4 - Explain two reasons why flat washers are used.Ch. A.4 - What is the purpose of a helical spring lock...Ch. A.4 - When is an internal-external tooth lock washer...Ch. A.4 - When are dowel pins used?Ch. A.4 - When are taper pins used?Ch. A.4 - When are roll pins used?Ch. A.4 - What are retaining lings?Ch. A.4 - Prob. 16STCh. A.4 - Prob. 17STCh. A.4 - Prob. 18STCh. A.5 - Prob. 1STCh. A.5 - Prob. 2STCh. A.5 - Prob. 3STCh. A.5 - Prob. 4STCh. A.5 - Prob. 5STCh. A.5 - Prob. 6STCh. A.6 - Prob. 1STCh. A.6 - Prob. 2STCh. A.6 - Prob. 3STCh. A.6 - Prob. 4STCh. A.6 - Prob. 5STCh. A.6 - Prob. 6STCh. A.6 - Prob. 7STCh. A.6 - Prob. 8STCh. A.6 - Prob. 9STCh. A.6 - Prob. 10STCh. A.7 - Prob. 1STCh. A.7 - Prob. 2STCh. A.7 - Prob. 3STCh. A.7 - Prob. 4STCh. A.7 - Prob. 5STCh. A.7 - Prob. 6STCh. A.7 - Prob. 7STCh. A.7 - Prob. 8STCh. A.7 - Prob. 9STCh. A.7 - Prob. 10STCh. A.8 - Prob. 1STCh. A.8 - Prob. 2STCh. A.8 - Prob. 3STCh. A.8 - Prob. 4STCh. A.8 - Prob. 5STCh. A.8 - Prob. 6STCh. A.8 - Prob. 7STCh. A.8 - Prob. 8STCh. A.8 - Prob. 9STCh. A.8 - Prob. 10STCh. A.8 - Prob. 11STCh. A.9 - Prob. 1.1QCCh. A.9 - Prob. 1.2QCCh. A.9 - Prob. 1.3QCCh. A.9 - Prob. 1.4QCCh. A.9 - Prob. 1.5QCCh. A.9 - Prob. 1.6QCCh. A.9 - Prob. 2.1QCCh. A.9 - Prob. 2.2QCCh. A.9 - Prob. 3.1QCCh. A.9 - Prob. 3.2QCCh. A.9 - Prob. 4.1QCCh. A.9 - Prob. 4.2QCCh. A.9 - Prob. 4.3QCCh. A.9 - Prob. 1STCh. A.9 - Prob. 2STCh. A.9 - Prob. 3STCh. A.9 - Prob. 4STCh. A.9 - Prob. 5STCh. A.9 - Prob. 6ST
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- 5. The figure shows a gear train. There is no friction at the bearings except for the gear tooth forces. The material of the milled gears is steel having a Brinell hardness of 170. The input shaft speed (n2) is 800 rpm. The face width and the contact angle for all gears are 1 in and 20° respectively. In this gear set, the endurance limit (Se) is 15 kpsi and nd (design factor) is 2. (a) Find the revolution speed of gear 5. (b) Determine whether each gear satisfies the design factor of 2.0 for bending fatigue. (c) Determine whether each gear satisfies the design factor of 2.0 for surface fatigue (contact stress). (d) According to the computation results of the questions (b) and (c), explain the possible failure mechanisms for each gear. N4=28 800rpm N₁=43 N5=34 N₂=14 P(diameteral pitch)=8 for all gears Coupled to 2.5hp motorarrow_forward1. The rotating steel shaft is simply supported by bearings at points of B and C, and is driven by a spur gear at D, which has a 6-in pitch diameter. The force F from the drive gear acts at a pressure angle of 20°. The shaft transmits a torque to point A of TA =3000 lbĘ in. The shaft is machined from steel with Sy=60kpsi and Sut=80 kpsi. (1) Draw a shear force diagram and a bending moment diagram by F. According to your analysis, where is the point of interest to evaluate the safety factor among A, B, C, and D? Describe the reason. (Hint: To find F, the torque Tд is generated by the tangential force of F (i.e. Ftangential-Fcos20°) When n=2.5, K=1.8, and K₁ =1.3, determine the diameter of the shaft based on (2) static analysis using DE theory (note that fatigue stress concentration factors need to be used for this question because the loading condition is fatigue) and (3) a fatigue analysis using modified Goodman. Note) A standard diameter is not required for the questions. 10 in Darrow_forward3 N2=28 P(diametral pitch)=8 for all gears Coupled to 25 hp motor N3=34 Full depth spur gears with pressure angle=20° N₂=2000 rpm (1) Compute the circular pitch, the center-to-center distance, and base circle radii. (2) Draw the free body diagram of gear 3 and show all the forces and the torque. (3) In mounting gears, the center-to-center distance was reduced by 0.1 inch. Calculate the new values of center-to-center distance, pressure angle, base circle radii, and pitch circle diameters. (4)What is the new tangential and radial forces for gear 3? (5) Under the new center to center distance, is the contact ratio (mc) increasing or decreasing?arrow_forward
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