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A screw jack has a single start thread of pitch 6mm and an operating handle of radius 350 mm as shown in Figure 2. 

The following readings of load and effort were taken during a test on the jack.

 

Figure 2

Load (kN)	0	1	2	3	4	5	6	7	8	9	10
Effort (N)	2.2	6.6	11.8	17.0	22.2	27.2	32.2	36.8	41.4	46.9	52.4

(a) Plot a graph of effort against load. Using the graph determine the law of the machine.

(b) Plot a graph of mechanical advantage against load.

(c) Plot a graph of efficiency against load and state whether the machine is likely to overhaul.

(d) Evaluate the theoretical limiting values of mechanical advantage and efficiency and explain whether your graphs tend towards these values.

(e) Calculate the work input and the work done against friction when raising the 10 kN load through a height of 50 mm.

Transcribed Image Text:

Single start thread, Operating handle length 350 mm Single start thread, Operating handle length 350 mm

Answer rating: 100% (QA)

MA loadeffort VR Distance moved by effortdistance moved by load 2x3506 36652 ABC Load N Effort N MA ... View the full answer