Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780077591670
Author: BUDYNAS
Publisher: MCG
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Textbook Question
Chapter 8, Problem 9P
Find the power required to drive a 1.5-in power screw having double square threads with a pitch of
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Find the power required to drive a 1.5-in power screw having double
square threads with a pitch of 1/4 in. The nut is to move at a velocity of 2
in/s and move a load of F = 2.2 kips. The frictional coefficients are 0.10
for the threads and 0.15 for the collar. The frictional diameter of the
collar is 2.25 in.
(11) Find the power required to drive a power screw lifting a load of 40001b. A 2½-in double square
thread with 2TPI. is to be used. The frictional radius of the collar is 2-in and the coefficients of friction
are 0.l for the threads and 0.15 for the collar. The velocity of the nut is 10fpm .
A single trapezoidal metric thread power screw is to raise a load of 60 kN. The screw has a mean diameter of 34 mm and a pitch of 5 mm. The coefficient of thread friction and collar friction are 0.15 and 0.11, respectively. The collar mean diameter is 90 mm and the screw turns at 150 rpm. Determine the total torque required to raise the load in N-m.
Chapter 8 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Ch. 8 - A power screw is 25 mm in diameter and has a...Ch. 8 - Using the information in the footnote of Table...Ch. 8 - Show that for zero collar friction the efficiency...Ch. 8 - A single-threaded power screw is 25 mm in diameter...Ch. 8 - The machine shown in the figure can be used for a...Ch. 8 - The press shown for Prob. 8-5 has a rated load of...Ch. 8 - For the screw clamp shown, a force is applied at...Ch. 8 - The C clamp shown in the figure for Prob. 8-7 uses...Ch. 8 - Find the power required to drive a 1.5-in power...Ch. 8 - A single square-thread power screw has an input...
Ch. 8 - Prob. 11PCh. 8 - An M14 2 hex-head bolt with a nut is used to...Ch. 8 - Prob. 13PCh. 8 - A 2-in steel plate and a 1-in cast-iron plate are...Ch. 8 - Repeat Prob. 8-14 with the addition of one 12 N...Ch. 8 - A 2-in steel plate and a 1-in cast-iron plate are...Ch. 8 - Two identical aluminum plates are each 2 in thick,...Ch. 8 - Prob. 18PCh. 8 - A 30-mm thick AISI 1020 steel plate is sandwiched...Ch. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - A 2-in steel plate and a 1-in cast-iron plate are...Ch. 8 - An aluminum bracket with a 12-in thick flange is...Ch. 8 - An M14 2 hex-head bolt with a nut is used to...Ch. 8 - A 34 in-16 UNF series SAE grade 5 bolt has a 34-in...Ch. 8 - From your experience with Prob. 8-26, generalize...Ch. 8 - Prob. 28PCh. 8 - Prob. 29PCh. 8 - Prob. 30PCh. 8 - For a bolted assembly with eight bolts, the...Ch. 8 - Prob. 32PCh. 8 - 8-33 to 8-36 The figure illustrates the...Ch. 8 - 8-33 to 8-36 The figure illustrates the...Ch. 8 - 8-33 to 8-36 The figure illustrates the...Ch. 8 - 8-33 to 8-36 The figure illustrates the...Ch. 8 - Prob. 37PCh. 8 - Prob. 38PCh. 8 - 837 to 840 Repeat the requirements for the problem...Ch. 8 - Prob. 40PCh. 8 - 841 to 844 For the pressure vessel defined in the...Ch. 8 - Prob. 42PCh. 8 - Prob. 43PCh. 8 - Prob. 44PCh. 8 - Bolts distributed about a bolt circle are often...Ch. 8 - The figure shows a cast-iron bearing block that is...Ch. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - Prob. 49PCh. 8 - Prob. 50PCh. 8 - 851 to 854 For the pressure cylinder defined in...Ch. 8 - Prob. 52PCh. 8 - 851 to 854 For the pressure cylinder defined in...Ch. 8 - 851 to 854 For the pressure cylinder defined in...Ch. 8 - 855 to 858 For the pressure cylinder defined in...Ch. 8 - 855 to 858 For the pressure cylinder defined in...Ch. 8 - 855 to 858 For the pressure cylinder defined in...Ch. 8 - For the pressure cylinder defined in the problem...Ch. 8 - A 1-in-diameter hot-rolled AISI 1144 steel rod is...Ch. 8 - The section of the sealed joint shown in the...Ch. 8 - Prob. 61PCh. 8 - Prob. 62PCh. 8 - Prob. 63PCh. 8 - Prob. 64PCh. 8 - Using the Goodman fatigue criterion, repeat Prob....Ch. 8 - The figure shows a bolted lap joint that uses SAE...Ch. 8 - Prob. 67PCh. 8 - A bolted lap joint using ISO class 5.8 bolts and...Ch. 8 - Prob. 69PCh. 8 - The figure shows a connection that employs three...Ch. 8 - A beam is made up by bolting together two cold...Ch. 8 - Prob. 72PCh. 8 - Prob. 73PCh. 8 - Prob. 74PCh. 8 - A vertical channel 152 76 (see Table A7) has a...Ch. 8 - The cantilever bracket is bolted to a column with...Ch. 8 - Prob. 77PCh. 8 - The figure shows a welded fitting which has been...Ch. 8 - Prob. 79PCh. 8 - Prob. 80PCh. 8 - Prob. 81P
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- (4) A single square-thread power screw has an input power of 3.0kW at a speed of 1 rev/s. The screw has a major diameter of 36mm and a pitch of 6mm. The frictional coefficients are 0.14 for the threads and 0.09 for the collar, with a collar friction radius of 45mm. Find: (a) the axial resisting load F (b) the combined efficiency of the screw and collar;arrow_forwardA cone clutch is mounted on a shaft which transmits power at 200 rpm. The small diameter of the cone is 200 mm, the cone face is 50 mm and the cone face makes an angle of 12 degrees with the horizontal. Determine the axial force necessary to engage the clutch to transmit 7 kW if the coefficient of friction of the contact surfaces is 0.15. What is the maximum pressure on the contact surfaces assuming uniform wear?arrow_forwardThe inner and outer radii of a hollow steel shaft are 50 mm and 100 mm, respectively. The hub of a steel gear wheel that is shrunk onto the hollow shaft has an outer radius of 150 mm. The maximum allowable tangential stress developed by shrinking the gear wheel onto the hollow shaft is 200 MPa. The length of hub parallel to the shaft axis is 200 mm, and the coefficient of static friction between the hub and the shaft is 0.40. Determine the maximum torque that may be transmitted by the gear wheel without slipping on the shaft.arrow_forward
- A single-threaded 25-mm power screw is 25 mm in diameter with a pitch of 5 mm. A vertical load on the screw reaches a maximum of 5 kN. The coefficients of friction are 0.06 for the collar and 0.09 for the threads. The frictional diameter of the collar is 45 mm. Find the overall efficiency, and the torque to “raise” and “lower” the load. If the effort load is 75 N, find the force ratio and movement ratio.arrow_forward1. A double square thread power screw has a pitch of 6 mm and mean radius of34 mm. If it is used to lift a load 50 kN and coefficient of friction of threads is 0.15, determine the torque required toturn the screw.A. 343.74 N-m B. 353.47 N-m C. 335.47 N-m D. 347.35 N-m2. A lubricated bolt needs an initial torque of 145 lb-ft to take the initial tension brought by the compressor withoutbreaking. Determine the initial torque needed by the bolt if the bolt was not lubricated.A. 107.85 lb-ft B.108.25 lb-ft C. 108.75 lb-ft D. 193.33 lb-ftarrow_forwardA double square thread power screw has a pitch of 6 mm and mean radius of 34 mm. If it is used to lift a load 50 kN and coefficient of friction of threads is 0.15, determine the torque required to turn the screw.arrow_forward
- A flat belt with a width of 120 mm and a thickness of 5 mm transmits power from a driving pulley with a diameter of 250 mm to a driven pulley with a diameter of 700 mm. The mass per unit length of the belt is 2.1 kg/m, and the coefficient of friction is 0.25. The input power of the belt is 60 kW at 1000 rpm. Calculate the following when the center distance is 3.5 m. (a) Maximum tensile stress of the belt(b) Axial load on each pulleyarrow_forwardA 600 mm steel pulley transmits 50 kW at 900 rpm. The arc of contact between the belt and pulley is 144 degrees, the coefficient of friction between belt and pulley is 0.3 and the safe working stress of the belt is 2750 kPa. Find the width of the belt used if the thickness is equal to 12 mm.arrow_forwardA vertical power screw with double start square threads of 50 mm mean diameter and 11mm pitch is raised against a load of 10 kN by means of a hand wheel, the boss of which is threaded to act as a nut. A thrust collar, taking up the axial load,supports the wheel boss and has a mean diameter of 60mm. The coefficient of friction is 0.18for the screw and 0.16for the collar. If the tangential force applied by each hand to the wheel is 200 N, find suitable diameter of the hand wheel.arrow_forward
- A double square thread power screw is to raise a load of 70 kN. The screw has a mean diameter of 33.375 mm and a pitch of 6 mm. The coefficient of thread friction and collar friction are 0.13 and 0.10, respectively. The collar mean diameter is 90 mm and the screw turns at 90 rpm. Which of the following is the torque required to overcome the collar friction? Group of answer choices 630000 N mm 315000 N mm 819000 N mm 409500 N mmarrow_forwardThe lead screw of a lathe has Acme threads of 60 mm outside diameter and 8 mm pitch. It supplies drive to a tool carriage which needs an axial force of 2150 N. A collar bearing with inner and outer radius as 30 mm and 60 mm respectively is provided. The coefficient of friction for the screw threads is 0.12 and for the collar it is 0.10. Find the torque required to drive the screw and the efficiency of the screw.arrow_forwardAn elevator type lift is being designed to raise a load up to 5,000pounds between floors. Two square-thread lead screws, 1.5 inches in (major) diameter, are used for this application. Determine the torque required to raise this lift if the moving part of the elevator weighs 800 pounds and the coefficient of friction is assumed to be 0.15. For the elevator described, find the efficiency and power required if each lead screw is driven at 175 rpm. Verify if this is self locking.arrow_forward
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