Precision Machining Technology (MindTap Course List)
2nd Edition
ISBN: 9781285444543
Author: Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher: Cengage Learning
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Textbook Question
Chapter 3.5, Problem 7RQ
The maximum distance that a spark breaker and tool rest should be from a wheel is ________.
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2 A metal block of mass m = 10 kg is sliding along a frictionless surface with an initial speed
Vo, as indicated below. The block then slides above an electromagnetic brake that applies a
force FEB to the block, opposing its motion. The magnitude of the electromagnetic force
varies quadratically with the distance moved along the brake (x):
10
FEB = kx²,
with k
= 5
N
m²
V₁ = 8 m/s
m = 10 kg
FEB
Frictionless surface
Electromagnetic brake
⇒x
Determine how far the block slides along the electromagnetic brake before stopping, in m.
Q1: Determine the length, angle of contact, and width of a 9.75 mm thick
leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The
diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at
300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The
density of the leather is 1000 kg/m³. The maximum allowable stress in the
leather is 2.5 MPa. The coefficient of friction between the leather and pulley is
0.3. Assume open belt drive.
5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having
20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made
of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel
having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day
under light shock conditions, find from the standpoint of strength,
1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear.
Check the gears thus designed from the consideration of wear. The surface endurance limit may be
taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]
Chapter 3 Solutions
Precision Machining Technology (MindTap Course List)
Ch. 3.1 - Information such as tolerances and scale can be...Ch. 3.1 - What view of a drawing usually shows the most...Ch. 3.1 - Prob. 3RQCh. 3.1 - The line type used to show edges of an object that...Ch. 3.1 - What line type is used to show edges of an object...Ch. 3.1 - What two line types work together to show sizes on...Ch. 3.1 - Identify the line types labeled in the print...Ch. 3.1 - Define and briefly describe the following...Ch. 3.1 - A dimension listed on an engineering drawing is...Ch. 3.1 - List and briefly describe the three types of...
Ch. 3.1 - Briefly describe the difference between a...Ch. 3.1 - The relationship between sizes of mating parts is...Ch. 3.1 - What does GDT stand for?Ch. 3.1 - A plane used as a reference for dimensions is...Ch. 3.1 - A GDT symbol and the amount of tolerance are shown...Ch. 3.1 - What are the five categories of symbols used in...Ch. 3.1 - Briefly explain the benefit of a position...Ch. 3.2 - Prob. 1RQCh. 3.2 - What is the purpose of layout fluid (dye)?Ch. 3.2 - Prob. 3RQCh. 3.2 - Briefly define a scriber and its use.Ch. 3.2 - What two angles can be laid out with the...Ch. 3.2 - What two tasks can a divider be used to perform?Ch. 3.2 - What safety precautions should be observed when...Ch. 3.2 - What would the divider setting be to scribe a...Ch. 3.2 - What would the divider setting be to scribe an arc...Ch. 3.2 - Prob. 10RQCh. 3.2 - Prob. 11RQCh. 3.2 - Briefly describe the use of a surface gage.Ch. 3.3 - What are three safety rules to observe when using...Ch. 3.3 - List three types of screwdriver tips.Ch. 3.3 - What is the advantage of using slip joint pliers?Ch. 3.3 - What is an advantage of using locking pliers?Ch. 3.3 - What are two uses for a ball peen hammer?Ch. 3.3 - What is the advantage of a soft face hammer?Ch. 3.3 - In what situation would a box-end wrench be chosen...Ch. 3.3 - List two precautions to observe when using...Ch. 3.3 - What is one method of preventing damage to work...Ch. 3.3 - List three safety precautions to be observed when...Ch. 3.3 - In which direction should hacksaw blade teeth...Ch. 3.3 - List two safety precautions that should be...Ch. 3.3 - Will a single-cut or a double-cut file remove...Ch. 3.3 - Will a single-cut or a double-cut file produce a...Ch. 3.3 - ___________ and _________ are two common filing...Ch. 3.3 - What tool is used to clean a file?Ch. 3.3 - What are the two forms of abrasives used in...Ch. 3.4 - Sawing machines can be divided into roughly four...Ch. 3.4 - The vertical band saw is particularly useful, as...Ch. 3.4 - The horizontal band saw is ideal for cutting...Ch. 3.4 - Cutting action on the power hacksaw is very...Ch. 3.4 - List three safety precautions to observe when...Ch. 3.4 - Briefly describe the process to prepare for...Ch. 3.4 - List three safety precautions to observe when...Ch. 3.4 - What type of band saw blade has HSS teeth welded...Ch. 3.4 - How many saw teeth should be engaged in the...Ch. 3.4 - Name the three different types of tooth patterns.Ch. 3.4 - What are the three types of tooth set and why is...Ch. 3.4 - The slot created in a workpiece by the saw blade...Ch. 3.4 - Explain how to use a push stick.Ch. 3.4 - Saws should be ____________ _____________ when a...Ch. 3.4 - Saw guides should be mounted ________ above the...Ch. 3.4 - Why must a band saw blade be annealed after...Ch. 3.4 - Why does a band saw blade need to be ground after...Ch. 3.4 - Clearance between the vertical band saw guides and...Ch. 3.4 - Band saw cutting speeds are given in _________.Ch. 3.5 - What is the main benefit of offhand abrasive...Ch. 3.5 - What type of metals should not be ground on a...Ch. 3.5 - Which wheel is finer, a 60 grit or a 36 grit?Ch. 3.5 - If a grinder runs at 3400 RPM and you have a wheel...Ch. 3.5 - How is a ring test performed?Ch. 3.5 - Why is it necessary to have blotters on both sides...Ch. 3.5 - The maximum distance that a spark breaker and tool...Ch. 3.5 - When should a grinding wheel be dressed?Ch. 3.5 - Where should you stand when using a grinder?Ch. 3.6 - Define drilling.Ch. 3.6 - What factors might determine when a hole must be...Ch. 3.6 - Prob. 3RQCh. 3.6 - Explain the purpose of a counterbore.Ch. 3.6 - What is the purpose of the pilot on a counterbore?Ch. 3.6 - What should be done as a drill nears the...Ch. 3.6 - Define thread as it relates to benchwork.Ch. 3.6 - Explain the major diameter of a thread.Ch. 3.6 - What is the TPI of a -20 thread?Ch. 3.6 - Name two types of tap wrenches.
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- 4. G A micarta pinion rotating at 1200 r.p.m. is to transmit 1 kW to a cast iron gear at a speed of 192 r.p.m. Assuming a starting overload of 20% and using 20° full depth involute teeth, determine the module, number of teeth on the pinion and gear and face width. Take allowable static strength for micarta as 40 MPa and for cast iron as 53 MPa. Check the pair in wear.arrow_forwardI want to solve these choicesarrow_forward2. A spur gear made of bronze drives a mid steel pinion with angular velocity ratio of 32: 1. The pressure angle is 14½. It transmits 5 kW at 1800 r.p.m. of pinion. Considering only strength, design the smallest diameter gears and find also necessary face width. The number of teeth should not be less than 15 teeth on either gear. The elastic strength of bronze may be taken as 84 MPa and of steel as 105 MPa. Lewis factor for 14½½ pressure angle may be taken 0.684 0.124 y = No. of teeth as [Ans. m 3 mm; b= 35 mm; Dp = 48 mm; D= 168 mm]arrow_forward
- Q2. Determine the safety factors for the bracket rod shown in Figure 2 based on both the distortion-energy theory and the maximum shear theory and compare them. Given: The material is 2024-T4 aluminum with a yield strength of 47 000 psi. The rod length /= 6 in. and arm a = 8 in. The rod outside diameter od 1.5 in., id = 1 in, h=2 in., t=0.5 in., Load F= 1000 lb. Assumptions: The load is static and the assembly is at room temperature. Consider shear due to transverse loading as well as other stresses. (Note: solve in SI units) wall tube Figure 2 armarrow_forwardThe question has been set up with all the cuts needed to accurately derive expressions for V(x) and M(x). Using the cuts free body diagrams set up below, derive expressions for V(x) and M(x). If you use the method of cuts then validate your answers using calculus or vice versa.arrow_forwardIt is required to treat 130 kmol/hr of chloroform-air feed gas mixture that contains 12% chloroform. It is required to remove 93% of chloroform using 150 kmol/hr of solvent that contains 99.6% water and 0.4% chloroform. The cross sectional area of the column is 0.8 m². Calculate the column height using the following data; kx'.a = 1.35 (kmol/m³.s (Ax)), and ky'.a = 0.06 (kmol/m³.s (Ay)), kx/ky = 1.35, and the equilibrium data are: X 0 0.0133 0.033 y 0 0.01 0.0266 0.049 0.064 0.0747 0.0933 0.1053 0.0433 0.06 0.0733 0.111 0.1 0.12 0.14arrow_forward
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