Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
Author: Richard G Budynas, Keith J Nisbett
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 8, Problem 4P
A single-threaded 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.
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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.
1. A single-threaded 25-mm power screw is 25-mm in diameter with a pitch of 5mm. A vertical load on
the screw reaches a maximum of 5 kN. The co-efficients 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.
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A single-threaded 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 0.05 for the collar and O.15 for the threads. The frictional diameter of the collar is 62 mm. Find the
overall efficiency and the torque to raise and lower the load.
The overall efficiency is
The torque to raise the load is
The torque to lower the load is
%.
kN-mm.
kN-mm.
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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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- A double square thread power screw has a mean radius of 90 mm and pitch of 12 mm is used to lift a load of 90 kN. If the friction of screw Is 0.14 and collar torque Is 25% of input torque, find the input torque required.arrow_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 single square thread power screw has a lead of 7 mm and mean diameter of 35 mm. If it Is used to lift a load of 30 kN and coefficient of friction of thread is 0.18, find the torque required to turn the screw.arrow_forward
- A single square-thread screw has an input power of 3 kW at a speed of 1 rev/s. The screw has a diameter of 40 mm and a pitch of 8 mm. The frictional coefficients are 0.16 for the threads and 0.09 for the collar, with a collar friction diameter of 50 mm. Find the axial resisting load Fand the combined efficiency of the screw and collar if the screw is raising the load. The axial resisting load Fis |kN. The combined efficiency of the screw and collar is %.arrow_forwardA conical pivot with angle of cone as 100° supports a load of 18 kN. The external radius is 2.5 times the internal radius. The shaft rotates at 150 rpm. f the intensity of pressure is to be 300 kN/m2 and coefficient of friction as 0.05, what is the ower lost in working against the friction?arrow_forwardFind the load that can be lifted by applying a force of 200 N at the end of 450 mm long lever of screw jack using single start square thread. The pitch of the thread is 12 mm and mean diameter 65 mm. The load does not rotate with the screw spindle. The C.O.F. between threads is 0.15 and for collar is 0.12 with mean radius 40 mm. Find also the efficiency.arrow_forward
- A conical pivot with angle of cone as 100° supports a load of 18 kN. The external radius is 2.5 times the interræl radius. The shaft rotates arr0 rpm. If the intensity of pressure is to be 300 kN/m? and coefficient of friction c is 05, what is the power lost in working againsi'lhe friction?arrow_forward(b)Find the torque required to raise the load of 15kN and mean diameter of triple threaded screw being 46mm. Also gIven pitch = 8mm and coefficient of friction is 0.15arrow_forwardProblem 8.4 A single-threaded square power screw is 0.5 inches in diameter with a pitch of 0.125 inches. A vertical load on the screw reaches a maximum of 90 lbs. The coefficients of friction are 0.05 for the collar and 0.06 for the threads. The frictional diameter of the collar is 1.5 inches. Find the overall efficiency and the torque to "raise" and "lower" the load.arrow_forward
- (9) A single thread trapezoidal metric thread has a pitch of 4mm &has a mean diameter of 18mm. It is used as a translation screw in conjunction with the collar having an outside diameter of 37mm & inside diameter of 27mm. Find the required torque in N-m to raise a load of 400kg, if the coefficient of friction is 0.3 for both threads & the collar.arrow_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 2000 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_forwardA power screw having single start square threads of 25 mm nominal diameter and 5 mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of screw collar are 50 mm and 20 mm respectively. The coefficient of thread friction and collar friction may be assumed as 0.2 and 0.15 respectively. The allowable thread bearing pressure is 5.8 N/mm², find: 1. The torque required to rotate the screw during raising and lowering the load. 2. The maximum shear stress in the screw. 3. The number of threads of nut in engagement with the screw.arrow_forward
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