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Question

This assignment requires the use of Mesyshaft Software.



A

vertical shaft is supported by two deep groove ball bearings as shown below. The shaft will be driven by vee belts through a pulley. The combined tensions of the belt apply and the weight of the pulley assembly applies a force of 5.4kN and 900N respectively. The shaft has a diameter of 32mm and it rotates at 300rpm. Bearing A at the top supports the shaft radially whereas bearing B at the bottom supports the shaft axially and radially. Two deep groove ball bearings have been selected for this application. The models of the bearings are 6305 and 6205 for bearing A and B respectively. A shock factor of 2 for vee belt forces is applied.


You are required to build a model of the shaft using the software Mesys Shaft Calculation, verify that the bearings are suitable for this application and analyse the stresses distribution in the bearings.



Analysis


Q1

What are the forces at bearing A and B?

A1


Q2

A shock factor of 2 applies. This means that all radial loads must be double.

a.    What are the forces at bearing A and B after applying this factor?

b.    Using the software Meyshaft, make a graph. Insert a screen shot* of the graph into this assignment showing the distribution of the forces in the shaft.

*You must ensure that the screen shot you paste as your answer is fully legible, and large enough for the assessor to read. If you need to, you can utilize a snipping tool to take the screen shot before inserting it in here.

A2


Q3

From the report, find the static load capacity for:

a.    Bearing A

b.    Bearing B

c.    Can the bearings support the loads

A3

Q4

What is the maximum and minimum stress in bearing A and which balls are concerned by these stresses?

Using the software Mesyshaft, submit the following graphs*:


·      load distribution graph for bearing A

·      contact stress graph for bearing A

*You must ensure that the screen shot you paste as your answer is fully legible, and large enough for the assessor to read. If you need to, you can utilize a snipping tool to take the screen shot before inserting it in here.

A4



Q5

What is the maximum and minimum stress in bearing B and which balls are concerned by these stresses?

Using the software Mesyshaft, submit the following graphs*:

·      load distribution graph for bearing B

·      contact stress graph for bearing B

*You must ensure that the screen shot you paste as your answer is fully legible, and large enough for the assessor to read. If you need to, you can utilize a snipping tool to take the screen shot before inserting it in here.

A5


Q6

What is the main difference in the stresses between the two bearings?

A6

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