Use Simple Screw Jack

 

Practical Significance:

Many times there is a need to lift the loads and depending upon the type of load, intensity of load and other site conditions different lifting machines are used. Simple Screw Jack machine is used to lift heavy loads with constraint of space. After performing this experiment a Diploma Engineer will be able to decide the suitability of screw jack based on the given load lifting situation.

Relevant Course Outcomes: 

Select the relevant simple lifting machine for a given purpose.

Practical Outcome:

Use Simple screw jack machine to lift heavy load.

Minimum Theoretical Background:

Simple Screw Jack: A screw jack is a simple device which is used to lift heavy loads such as large vehicles. It mainly consists of three parts. A nut attached to a pedestal or stand, a large screw fitted within the nut and lever attached to the head of the screw. The weight which is to be lifted is placed on either on the head of the screw or on the platform attached to the screw. Sometimes a wheel is fixed at top and effort is applied tangentially to the circumference of the wheel. A screw thread is cut just like an inclined plane. The distance which the screw advances in one turn is called lead distance and distance measured between two consecutive threads is called pitch distance. The screw jack works on the principle similar to that of an inclined plane.

Conduction of practical:

Practical Related Questions

1. Write four field applications of screw jack. 

2. What is the maximum load lifting capacity of given screw jack?

3. Can this machine is used to lift smaller loads?

4. Weather the given machine is reversible or not? Give reason, 

5. Explain self locking condition is achieved? Is it advantageous?

6. Which is modified version of inclined plane?