Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 4.2, Problem 11RQ
Which would be the best workholding device for holding a 1 "-diameter × 6"-long shaft so that a cross hole for a grease fitting could be drilled?
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Chapter 4 Solutions
Precision Machining Technology
Ch. 4.1 - Upright drill presses are available in _______ and...Ch. 4.1 - List two general types of upright drill press...Ch. 4.1 - Explain how the size of an upright drill press is...Ch. 4.1 - Briefly describe the term sensitive drill press.Ch. 4.1 - Briefly describe a gang drill press and its...Ch. 4.1 - When would a radial-arm drill press most likely be...Ch. 4.1 - Briefly describe a micro drill press and its...Ch. 4.2 - What are the two main materials used to make...Ch. 4.2 - What two types of shanks are commonly found on...Ch. 4.2 - Name three functions of the flutes on a twist...
Ch. 4.2 - Name two types of flute styles for machine...Ch. 4.2 - Prob. 5RQCh. 4.2 - What is the major difference between counterboring...Ch. 4.2 - What must be used to secure a workpiece to an...Ch. 4.2 - What devices are used to elevate a workpiece to...Ch. 4.2 - If 50 parts measuring 1" I" 3" each needed a...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.3 - List five drill press safety guidelines.Ch. 4.3 - Briefly define the term cutting speed.Ch. 4.3 - What unit of measure is used to define cutting...Ch. 4.3 - What is feed, and how is feed stated for drill...Ch. 4.3 - Briefly describe two methods for locating hole...Ch. 4.3 - What is spotting and why is it performed?Ch. 4.3 - What is pecking, or peck drilling?Ch. 4.3 - Briefly contrast the speed and feed differences...Ch. 4.3 - What drill press component can be used to control...Ch. 4.3 - Calculate feed depth for a 90-degree countersink...Ch. 4.3 - Calculate feed depth for an 82-degree countersink...Ch. 4.3 - What benefit does tapping on the drill press offer...Ch. 4.3 - How many turns must a 1/4-20 tap be turned into a...Ch. 4.3 - Prob. 14RQ
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- For the beam and loading shown, (a) draw the shear and bending moment diagrams, (b) determine the magnitude and location of the maximum absolute value of the bending momentConsider A = 0please show step by step process, i did something wrong with bending moment diagram( length of beam = 2 + 6 + 2)arrow_forwardCORRECT ANSWER ONLY WITH COMPLETE FBD. PREFERABLY HANDWRITTEN. I WILL UPVOTE 1. The beam shown carries the following loads:Total dead load, wDL = 36 kN/mConcentrated live load, PLL = 240 kNThe beam section is HSS16X12X3/8 with properties:Span, L = 6 mArea, A = 12,100 mm2Moment of inertia about x-axis, Ix = 292 x 106 mm4Fy = 345 MPa 1. Calculate the location of the live load, from the left support, for maximum moment to occur at the fixed support.Answer: 2.536 m2. Calculate the maximum moment. Answer: 439.128 kN-marrow_forwardCORRECT ANSWER AND COMPLETE FBD ONLY. I PREFER HANDWRITTEN BUT ITS OKAY IF NOT. I WILL UPVOTE 2. The space truss shown is supported by ball-and-socket joints at A, B and C. Factored loads P1 and P2 areacting on joints D and E, respectively, towards the negative y-direction. 1. Calculate the stress of member CE, indicate tension or compression. Answer: 23.61 MPa Tension2. Calculate the stress of member AD, indicate tension or compression. Answer: 21.01 MPa Compression3. Calculate the stress of member CD, indicate tension or compression. Answer: 11.03 MPa Tensionarrow_forward
- CORRECT ANSWER AND COMPLETE FBD ONLY. I PREFER HANDWRITTEN BUT ITS OKAY IF NOT. I WILL UPVOTE 3. The frame has pin supports at A and E, subject to a wind load. Treat joint C to be an internal hinge. Given:Dimensions, H1 = 3.0 m; H2 = 4.5 m; L = 10.0 mWind loads, wWL (AB) = 4.8 kN/m; wWL (BC) = 3.9 kN/m; wWL (CD) = 1.5 kN/m; wWL (DE) = 1.2 kN/mMembers are made of A36 steel Wide Flange Section with the following properties:Area, A = 64000 mm2Depth, d = 762 mmFlange width, bf = 371 mmThickness of web, tw = 32 mmThickness of flange, tf = 57.9 mmMoment of inertia about x-axis, Ix = 6080 x 106 mm4The wide flange is oriented so that the bending is about the x-axis1. Calculate the stress in member AB, due to the axial load it carries, indicate if tension or compression.Answer: 0.0476 MPa Tension2. Calculate the stress in member DE, due to the axial load it carries, indicate if tension or compression.Answer: 0.2351 MPa Compression3. Calculate the maximum bending stress at B. Answer: 4.282 MPaarrow_forward32 mm 32 mm b' c' C 32 mm 32 mm b PROBLEM 6.41 a The extruded beam shown has a uniform wall thickness of 3 mm. Knowing that the vertical shear in the beam is 9 kN, determine the shearing stress at each of the five points indicated.arrow_forwardIn a structural reliability problem, the resistance (capacity) R and load effect (demand) S random variables associated with a failure mode of the structure of interest are normally distributed and statistically independent with the following probability distribution parameters (or statistics) in consistent units: MR = 12, σR = 3 μs = 5, σs = 2 (a) Determine the exact probability of failure pF ·arrow_forward
- The resistance R and load effect S for a given failure mode are statistically independent random variables with marginal PDF's 1 fR (r) = 0≤r≤100 100' fs(s)=0.05e-0.05s (a) Determine the probability of failure by computing the probability content of the failure domain defined as {rarrow_forwardPlease solve this problem as soon as possible My ID# 016948724arrow_forwardThe 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 5arrow_forwardQuestion 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.arrow_forward5. 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_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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