Homework Answers
The main difference you can see is the difference in wall thickness and the addition of ribs.
In figure (a) the wall thickness is not uniform, it has changed from 25mm to 38mm while in figure (b) the wall thickness is uniform that is 25mm.
In casting it is always important to have a uniform wall thickness so that the rate of cooling is uniform throughout to minimise the variations of dimension as well as for the easier metal flow for the part manufactured.
In figure (b), with the addition of ribs, the wall thickness is made uniform without reducing the strength of the part and also it makes the part lighter and uses less valuable material.
Figure (b) has the advantages mentioned above compared to figure (a).
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