What Happens During a Professional Scissor Sharpening?

By Matthew Grumley, Master Scissorsmith — 35+ years sharpening professional hairdressing scissors, 100,000+ pairs sharpened since 2007

Most hairdressers have never actually watched their scissors being sharpened. You hand them over, and an hour later they come back in a pouch. Whether what happened in between was a proper service or a quick scrape on a wheel — most stylists have no idea.

So pull up a stool at my service bench. This is exactly what happens when a pair of professional hairdressing scissors comes into ShearGenius for a full service — the actual sequence of work, in the order I do it, on every single pair. By the end you'll know what a proper scissor sharpening process looks like, why it takes the time it does, and how to spot a five-minute hatchet job before it costs you a grand in repairs.

Step 1 — Inspection and Diagnosis

Before a single grinding wheel turns, every pair of scissors goes under magnification. I use a bench-mounted lens and a strong directional light, because the things that ruin a haircut are usually invisible to the naked eye.

What I'm looking for:

• Edge condition — micro-nicks, rolled edges, chipped tips, flat spots where the convex curve has been worn or ground away.
• Blade alignment — when the blades are closed, do the tips meet cleanly? Is one blade twisted or sprung?
• Pivot and screw — is the screw worn, the washer compressed, the bearing dry or gritty? A loose pivot makes any sharpening pointless.
• Tension — I do a quick drop test before disassembly to feel where the scissor is sitting. Too tight crushes hair, too loose folds it.
• Ride line — the contact line where the two blades meet. This tells me whether the scissor will cut all the way to the tip or fold strands halfway down.

I write all of this on a job card. If a scissor has been butchered by a previous "sharpener" and needs more than a service — say, the convex edge has been ground flat — I ring the owner before I touch it. No surprises.

Step 2 — Disassembly and Cleaning

Next, the screw comes out. Every pair gets fully disassembled — anyone who sharpens scissors without taking them apart isn't sharpening them properly. Hair, skin oil, hairspray, colour residue and old lubricant build up around the pivot and along the ride, and you cannot grind a clean edge through that gunk.

Each blade goes through a degrease bath. Heavily contaminated scissors — especially from a colour-heavy salon — go into the ultrasonic cleaner, which uses high-frequency sound waves to lift gunk out of the pivot bore and from between the bearing washers. The screw, washer and bumper get cleaned and inspected separately. If the bearing is flogged, it gets replaced now. This is also when surprises turn up — a hairline crack near the finger ring, a stripped thread, a bent shank from a drop. Better found on the bench than mid-grind.

Step 3 — Grinding the Edge

Now we get to the part everyone thinks of as "sharpening" — but it's only one of eight steps, and it's the one most likely to destroy your scissors if it's done wrong.

Professional hairdressing scissors have a convex edge — a curved, hollow-ground bevel that produces the slicing cut hairdressers rely on. That curve has to be preserved exactly. I use dedicated convex wheels, run wet, with a strict grit progression: coarse to medium to fine, never skipping a step. Each blade is held at the precise angle the manufacturer originally ground it — usually 40 to 50 degrees, but it varies by brand and model, which is why experience matters.

Why bench grinders are banned in this workshop. A dry bench grinder spinning at 3,000+ RPM will burn the temper out of Japanese steel in about four seconds. Once the edge turns blue, the hardness is gone forever — you've just turned a $600 scissor into a $600 butter knife. Worse, a flat wheel cannot follow a convex curve; it flattens the edge into a bevel, and from that day on the scissor folds hair instead of cutting it. For the long version, see why DIY sharpening fails. Real convex sharpening uses slow-running, water-cooled wheels — the only way to keep the edge cool, the curve intact, and the heat treatment alive.

Step 4 — Honing and Polishing

Grinding creates a fresh edge but leaves a microscopic burr — a tiny curl of metal hanging off the cutting line. Remove it wrong and the scissor feels sharp for one haircut, then goes blunt overnight as the burr breaks off taking the new edge with it.

So every blade then moves to honing. Finer abrasives, lighter pressure, more passes. I work up through progressively finer grits until the edge takes on a mirror polish. The burr is stropped off with a leather-faced wheel charged with polishing compound, working from spine to edge, never the other way. A properly honed convex edge isn't just sharp — it's smooth. Under magnification you see a clean, continuous line with no serrations, no chatter marks, no rolled lip. That's the difference between a scissor that lasts six months between services and one that lasts six weeks.

Step 5 — Blade Ride Adjustment

This is the step almost no one outside the trade understands, and it separates a good sharpener from a great one. A pair of scissors doesn't cut because the edges are sharp — it cuts because the two edges meet correctly along their entire length as the blades close. That meeting line is the ride, and the slight inward curve that makes it possible is the set of the scissor. If the set is wrong, even a razor edge will fold hair, push it forward, or cut cleanly at the heel and chew it at the tip.

To adjust the ride, I close the blades against a light source and read the contact line. If there's a gap mid-blade, I gently re-set the curve using a setting block — a controlled, measured flex, never a hammer, never brute force. This is millimetre work. Done right, when you close the scissor slowly you feel one continuous, even resistance from the pivot all the way to the tips. Skip this step and your scissors come back polished but cutting worse than they did when you sent them in. It happens all the time.

Step 6 — Reassembly and Tension Setting

With both blades sharpened, honed and re-set, the scissor goes back together. Clean screw, clean washer, a single drop of the right lubricant on the pivot bearing, and the blades carefully aligned before the screw is re-tensioned.

Tension is set by feel and confirmed by the drop test: hold the scissor horizontally by one finger ring with the blades open at 90 degrees, then let the top blade fall under its own weight. It should swing closed smoothly and stop about a third of the way before fully closed — not slam shut, not stick, not fall in jerks. Tension is the most-misunderstood thing about scissors and it changes how the edge wears every day. To manage it yourself between services, see my full scissor tension guide.

Step 7 — Test Cutting

The scissor isn't finished until it has passed three test cuts. Not one. Three. Each one tells me something different:

1. Wet cotton wool. A pulled tuft of damp cotton is the closest thing on a workbench to wet hair behavior. If the convex edge is true and the ride is set, the scissor glides through cleanly with no drag. If it grabs or pushes the cotton, the ride is off and I go back to Step 5.
2. Dry tissue paper. A single sheet of tissue, held loosely by one corner, cut from the heel of the blade right out to the tip. The cut must be clean from end to end, with no folding, no tearing, and no point where the tissue snags. This is the brutal one — tissue paper exposes any flat spot or burr instantly.
3. Hair strand. Finally, a small section of real hair, dry-cut at the very tips. The strands should release cleanly with no push, no fold, and that unmistakable quiet "tick" of a properly tuned scissor.

If the scissor fails any of the three, it goes back on the bench. No exceptions, no "she'll be right." Three clean tests or it doesn't leave the workshop.

Step 8 — Oiling and Final Inspection

With the scissor cutting properly, it gets a final wipe-down with a microfibre cloth, a single drop of dedicated scissor oil at the pivot, the blades worked open and closed a dozen times to distribute it, and any excess wiped clean. I use proper purpose-formulated scissor oil — never WD-40, never sewing machine oil, never 3-in-1. The wrong lubricant will gum up the bearing and attract hair clippings like a magnet.

One last look under magnification, a final check of the tension, the job card signed off, and the scissor goes back into its case ready for the owner. Total elapsed time on a standard service: 30 to 60 minutes per pair, depending on condition.

How Long Does It Take?

A properly executed professional hairdressing scissor sharpening takes between 30 and 60 minutes per pair. Not per dozen — per pair. There's no shortcut. The grinding, honing and polishing on convex wheels with multiple grit changes takes time, and the ride adjustment and test cutting can easily take ten minutes on their own.

So if a mobile bloke pulls up out the front of your salon and offers to do five pairs in 20 minutes, the maths doesn't work. He's running each scissor across a single coarse wheel, wiping it on his apron, and handing it back. No disassembly, no honing, no ride check, no test cuts. The edge feels rough-sharp for two haircuts and then collapses, because the burr was never removed and the convex curve is now flatter than it was before.

Five-minute sharpening is the single biggest cause of premature scissor death I see in this trade. If someone offers it to you, politely close the door. Your scissors are worth more than that.

For context on how often a properly serviced scissor actually needs to come back to the bench, have a read of my sharpening schedule — it's almost certainly less often than you've been told.

What ShearGenius Does Differently

I've been sharpening professional hairdressing scissors for 35+ years. I trained under old-school cutlers, learned convex grinding the hard way (on my own scissors, ruined plenty figuring it out), and built up a workshop with the right machinery — slow-running water-cooled convex wheels, dedicated honing and polishing stations, ultrasonic cleaning, bench magnification, the lot. 100,000+ pairs sharpened since 2007.

Every pair gets the full eight-step service described above. Not the express version. The full service, every time, whether it's a $200 apprentice scissor or an $1,800 Japanese flagship pair. Flat pricing — $70 per pair for ShearGenius brand scissors, $80 per pair for all other brands, no hidden fees, same-day turnaround for mobile service. Every service comes with a written warranty — if a scissor I've sharpened doesn't cut cleanly when it lands back in your hand, I fix it at my cost, no argument.

I run a mobile sharpening service across Victoria, Tasmania and South Australia, coming directly to salons so your scissors are back in your hands the same day. You can watch the service happen if you want — most owners do, the first time, and it's how I'd prefer it. Transparency is the whole point.

Ready to See It Done Properly?

If your scissors haven't been serviced this year, or the last "sharpener" left them worse than before, book a proper service. Eight steps, three test cuts, written warranty — and scissors that cut the way they did the day they came out of the box.

Book ShearGenius Mobile Sharpening →

Matthew Grumley is the founder and master scissorsmith at ShearGenius. 35+ years on the bench, 100,000+ pairs sharpened since 2007.