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When designing scissors, how do you design the blade geometry to ensure good cutting capabilities?

Engineering Asked by Abel Velasco Vilanova on January 23, 2021

I have been looking online and found there should be two points of contact, one in the blades and one in the pin. In order to achieve this, I assume there’s a slight angle of the blades into the opposite blade.

However, I couldn’t find any information about specific numbers. How would I go about designing scissors that ensure the aforementioned contact while not being too hard to actuate?

Thanks!

One Answer

Yes, there is a gentle curve (not angle ) built into the blades, designed to counter the small play in the hinge. This curve holds the cutting edges close together but at the same time it should not be too much as to interfere with the smooth mechanism of the scissors, my estimate is the curve trace angle is under one degree.

It has to do with the stiffness of the alloy of the blades and what kind of heat profile they have been hardened with too.

Answered by kamran on January 23, 2021

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