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There are a lot of roving sharpeners out there using the wrong equipment to sharpen convex shears. Motorized grinding wheels will sharpen many things, but using them on convex shears results in poor quality work. The first two pictures below show shears that were ruined by untrained, unskilled sharpeners using grinding wheels instead of a flat hone.
The first picture looks as if it was scraped on a curb to sharpen it, and the middle picture shows a shear that appears twisted because it was over-sharpened.
The third picture shows that an unskilled sharpener ground a convex edge into a single bevel edge, taking years off its functional life.
Sharpeners MUST have the right equipment, and more importantly the proper training. I sharpen right in front of my clients, not from the back of a van or trailer.
Pictured below is a top-of-the-line Tormek T-8 water cooled grinding-wheel-style sharpener for knives and single-bevel shears for fabric, upholstery, etc. But NEVER on convex edge shears. The second picture shows a top-of-the-line Hira To flat hone that is designed to properly shape the convex edge. The Japanese water stones next to the Hira To machine are 1,500 and 5,000 grit to flatten and sharpen the cutting edge. I use the right equipment, have the right training, and always give my clients my best effort, every day.
