24/11/2025
Blade Setting — And Why It’s Absolutely Crucial
Close your scissors fully, hold them up to a light source, and look between the blades. You’ll notice something interesting: the only part of the blades that should actually touch when fully closed is right at the very tip.
This is because both blades have a slight curve built into them. This curve is known as Set Curve or Set Geometry.
Different scissors have different amounts of set geometry. Longer blades naturally require more because they need greater “attack” to cut properly.
More set = more attack = more cutting power.
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When Set Geometry Goes Wrong
Several things can change or distort a scissor’s set:
• Wear and tear
• Heavy-handed usage
• Dropping or impact damage
You’ll feel it immediately:
• Hair pushes away at the tips
• Hair folds
• The scissors start grabbing unexpectedly
These are classic signs that the set geometry has shifted.
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How a Scissorsmith Fixes It
Traditionally, scissors could be reset with a small precision setting hammer and anvil.
These days? Modern alloys don’t tolerate that sudden impact. They require a different approach.
Today, the correct set geometry is restored using:
• Moderate heat
• Moderate compression
This works because modern steels are incredibly resilient—but also less forgiving of shock.
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What About Heat and Temper?
Some argue that using heat will destroy the temper of the steel.
They’re not entirely wrong, but they’re not entirely right either.
• Stainless steel only loses temper when heated past 450°C for long enough to cause colour change (blueing/burning).
• Resetting with moderate heat rarely exceeds 80°C, and only for a few seconds.
• In other words: safe, controlled, and nowhere near de-tempering range.
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So Next Time Your Scissors Fold or Catch Hair…
Ask yourself a simple question:
Could they be out of set?
Because in many cases, that’s all it is — and with the right tools and the right hands, it’s completely fixable.