A sluice gate weighing 18 kN is raised and lowered by means of square threaded screws, as shown in Fig.10.30. The frictional resistance induced by water pressure against the gate when it is in its lowest position is 4000 N. The outside diameter of the screw is 60 mm and pitch is 10 mm. The outside and inside diameter of washer is 150 mm and 50 mm respectively. The coefficient of friction between the screw and nut is 0.1 and for the washer and seat is 0.12. Find : 1. The maximum force to be exerted at the ends of the lever for raising and lowering the gate, and 2. Efficiency of the arrangement
A sluice gate weighing 18 kN is raised and lowered by means of square threaded screws, as shown in Fig.10.30. The frictional resistance induced by water pressure against the gate when it is in its lowest position is 4000 N. The outside diameter of the screw is 60 mm and pitch is 10 mm. The outside and inside diameter of washer is 150 mm and 50 mm respectively. The coefficient of friction between the screw and nut is 0.1 and for the washer and seat is 0.12. Find : 1. The maximum force to be exerted at the ends of the lever for raising and lowering the gate, and 2. Efficiency of the arrangement
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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Question
A sluice gate weighing 18 kN is raised and lowered
by means of square threaded screws, as shown in
Fig.10.30. The frictional resistance induced by water
pressure against the gate when it is in its lowest
position is 4000 N.
The outside diameter of the screw is 60 mm and pitch
is 10 mm. The outside and inside diameter of washer
is 150 mm and 50 mm respectively. The coefficient
of friction between the screw and nut is 0.1 and for
the washer and seat is 0.12. Find :
1. The maximum force to be exerted at the ends of the lever for raising and lowering the gate, and
2. Efficiency of the arrangement
Transcribed Image Text:1m
1m
VP,
VP,
Thrust
washer
Nut
Screw
Fig. 10.30
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