bartleby.com/questions-an 3 QSEARCH ASK CHAT VX MATH SOLV 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 mm

bartleby.com/questions-an 3 QSEARCH ASK CHAT VX MATH SOLV 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 mm

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

See similar textbooks

Similar questions

STRENGHT OF MATERIALS (TORSION)100% GUARANTEE UPVOTE IF ANSWER IN 2 HOURSE AND 30 MINUTES.. COMPLETE SOLUTION SHORTCUT IF NECESSARY
For a square thread power screw, given that:F= 6.4 kNPitch = 5 mmMajor diameter = 32 mmTotal raising torque = 28 N.mThen then max. torsional shear stress equals:
A single-threaded power screw of ACME form is to lift a load of 585 kg at 50 rpm. The mean diameter is 20 mm and pitch is 5 mm. Assume that the friction on threads is 0.1. Determine the torque needed to turn the screw in N-m without considering collar torque.
A car jack uses a single square-thread screw to raise a known load. The major diameter and pitch of the screw and the thrust collar mean diameter are known. Running friction coefficients are estimated. Find: (a) Determine the thread depth and helix angle. (b) Estimate the starting torque for raising and lowering the load. (c) Estimate the efficiency of the jack for raising the load. (d) Estimate the power required to drive the screw at a constant 1 revolution per second. Schematic and Given Data: Load 50 kN NOTE: ANSWER ONLY LETETRS C AND D.
i li. O 9:00 Email address * baqir.hilal1306@student.uobabylon.edu.iq (Q1) A power screw with double start ASME thread is proposed to be used for cyclically raise and lower a load of 1000 lb at an axial velocity of 4 in/sec. It has three threads per inch and with thread outside diameter of 1.50 inches. The proposed mean collar radius is 1 inch. The starting and sliding friction coefficients for the screw and the collar are f_starting%3D0.06 and f_running=0.03 find: a. The staring and the sliding torque required to raise the load.b. Check the self-locking condition for the screw assembly. c. What is the power screw efficiency of the proposed assembly?d. If a special gear motor is to be used to drive this power screw assembly, what would be the minimum power and torque requirements for the drive motor?e. The length of the nut if the permissible bearing pressure is 725psi. Option 1 العربية الإنجليزية
A double square threaded power screw has an efficiency of 65% when raising a load. Friction angle for threads is 8.54o, with collar friction negligible. The pitch diameter of the screw is 70 mm. When lowering a load, a uniform speed is maintained by a brake. If the load is 10 tons, what torque must be exerted by the brake? Is this screw self-locking?
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 14.5°. The wheelchair has a maximum velocity of 5 m/s when its pinion rotates at 800 r.p.m. Calculate: 1.4. The length of a path of a recess in mm. 1.5. The addendum of the gears in mm. 1.6. The contact ratio.
Quickly please.
A spur pinion rotates at 1932 rpm and transmits to a mating gear 30 HP. The pitchdiameter is 4” and the pressure angles is 14 ½. Determine the tangential load in lbs.
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 14.5°. The wheelchair has a maximum velocity of 5 m/s when its pinion rotates at 800 r.p.m. Calculate: 1.5. The addendum of the gears in mm. 1.6. The contact ratio.
(4) An electric motor purchased by your employer surprisingly arrived without a keyway in the shaft. The motor has power rating of 7.5kW & 1,800rpm & has a shaft of Ø17mm. It will be used to drive a centrifugal pump using cast iron sheave. Design the square key to be used in the assembly based on maximum bearing & shearing stresses of 580MPa & 370MPa, respectively, and factor of safety of 5.
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