1. A machine vice, as shown in the figure has single start, square threads with 22 mmnominal diameter and 5 mm pitch. The diameter of the collar is 55 mm. the coefficientsof friction for thread and collar are 0.15 and 0.17 respectively. The machinist cancomfortably exert a force of 125 N on the handle at a mean radius of 150 mm.Assuming uniform wear for the collar,a) Calculate the clamping force developed between the jaws,b) Calculate the overall efficiency of the clamp.FixedjawMovingjawFrameScrew150 mmHandle

Answered: Image /qna-images/answer/5307fb9b-1c65-4d78-ae65-db8d5e9c9b72.jpg

Answered: 1. A machine vice, as shown in the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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4 A double-threaded power screw with square threads pushes against a load of 3,641 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 3 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer 2 points
(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 0.15?
1. Name some uses of threads. Give an example of each. NOTE: Screw Thread – A screw thread may be visualized as a flexible form, like a piece of string that has been wrapped around a cylinder, or the sides of the cylindrical hole, at a uniform rate of advance, producing a form known as a helix. It may also be considered as a raised form produced on the outside of a cylinder, or on the inside walls of a cylindrical hole after a thread-cutting operation has been completed.
A press with screw with ACME threads shown in Figure 2 has a rate load of 1500 N. The outside diameter of ACME screw is 30 mm, and its pitch is 3.5 mm. Coefficients of friction are u = 0.1 for the threads and le =0.15 for the collar. The collar diameter de = 23 mm. A force F= 30 N is applied at end the handle to operate the press, Design the length of the handle, L. 西意 P= 30 N | 500 N
A worm drive transmits 15 kW at 2000 rpm to a worm gear having 90 teeth with 6mm module. The worm is triple threaded and has 65 mm pitch diameter. The tooth form is to be 20 degrees full depth involute. Determine: a) the lead and lead angle of the worm A. b) The center distance between worm and gear. c) The tangential force acting on worm. d) The axial force acting on worm e) The radial force acting on worm
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 pulley
A pinion shaft of a machine transmits a torque of 42 Nm to the shaft of gear at a speed of 578 rpm, which is input at pinion gear and its shaft rotates in the clockwise direction. The number of teeth on the pinion and the gear are 38 and 78 respectively, while the module is 6 mm. Assume a pressure angle of 200. Calculate: i) Power transmitted by the shaft of the pinion in W. ( ii) Torque on the shaft of the gear in Nm. iii) Speed ratio iv) Tangential load on the pinion in N
A simple gear train of 30 and 50 teeth for pinion and gear wheel respectively, is used to drive an electric wheelchair at a velocity that is double the maximum velocity of slip. The pinion has an equal addendum as the gear wheel, a module of 3 mm, and a pressure angle of 14.5o. The wheelchair has a maximum velocity of 5 m/s when its pinion rotates at 800 r.p.m. Calculate: 1.The length of a path of a recess in mm.2. The addendum of the gears in mm.
Ex] A double-threaded right-handed worm gear transmits 15 Hp at 1150 rpm. The pitch of the worm is 0.75 inch and the pitch diam of 3 inches. The pressure angle is 14.5° and the coefficient of friction is 0.12. a) Find the tangential force on the gear. b) Find tangential force on worm. c) Find the separating force Solution: (To be discussed by the Instructor during the lecture period)
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.
Read carefully. Please solve ellaborately and include the untis in every step, and write your solutions clearly and readable if your solution is in written form, Your work will be appreaciated much. Thank You! The area of American, UNC bolt is 0.61i .in2 with pitch of 5mm. A. What is the bolt nominal diameter, mm? B. The bolt designation.
QI: A double-threaded 30-mm power screw is 30 mm in diameter with a pitch of 6 mm. The coefficients of friction are 0.05 for the collar and 0.08 for the threads. The frictional diameter of the collar is 40 mm. if Tg=18 N.m: 1- Find the A vertical load on the screw, the torque used to lower the load and screw efficiency. 2- Compute all the stresses on the screw body that will cause by the load.

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