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Compare the properties of the thread machined at (i) and the properties of the thread rolled at (ii) shown below. - Leaving Cert Engineering - Question m - 2011
Question m
Compare the properties of the thread machined at (i) and the properties of the thread rolled at (ii) shown below.
Worked Solution & Example Answer:Compare the properties of the thread machined at (i) and the properties of the thread rolled at (ii) shown below. - Leaving Cert Engineering - Question m - 2011
Step 1
Properties of the Thread Machined at (i)
Answer
The machined thread is created by cutting the thread profile out of the blank material. This process can result in a thread that may be prone to weaknesses, especially if subjected to excessive force or stress. The sharp edges produced during machining can lead to stress concentrations that may weaken the thread.
Step 2
Properties of the Thread Rolled at (ii)
Answer
In contrast, the rolled thread is formed by rolling the metal into shape rather than cutting it. This method enhances the thread's strength significantly by aligning the grain structure of the metal along the thread. As a result, rolled threads typically exhibit improved hardiness and are less likely to fail under load compared to machined threads.