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Shear Stress

Shear stress problem
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My answer to question 5 is wrong, can you correct? PCD = pitch circle diameter

Factor of safety = ultimate tensile stress / safe working stress

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I find two essential and one secondary errors in your text:

(1) In your sentence "If PCD meant the diameter to start with this shear stress is 2 kN m / 200 mm ...". The error is that you divided the torque by the DIAMETER.
The correct formula ...

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