A common myth is that one sharpening can be sharper than another. Untrue! All skates are sharpened to the exact same sharpness. It's the depth of the hollow, and evenness of the edges that makes a skate feel sharper or duller. Basic sharpening places a hollow or groove in the skate blade. To do this, the sharpener must first shape/round the edge of his grinding stone to a specific radius. Radius of Hollow are not complex to understand, it's simple basic math. Everyone who completed elementary school knows what a 1/2" radius circle is, right? You remember, you take the compass instrument, pull out the pencil part 1/2 inch, place the pointy part on the piece of paper and twirl it around till you have a circle. Bingo, you have a 1/2" radius circle. The sharpener uses a similar instrument to the compass to shape the outside of his grinding stone to 1/2", except his instrument has a diamond cutting tool on the end instead of a pencil. His stone now has the same shape on the outer edge as that 1/2" radius circle you drew on the paper. Now when he applies a skate to the stone, the 1/2" radius is transferred and cut into the skate blade. The curve of the radius creates a groove or hollow between the two edges on the outside of each blade.
No single hollow is right for every hockey player. A shop or automated machine that sharpens all skates the same is doing a disservice to the skater. There are many hollows to choose from, and several individual factors need to be considered before a hollow is chosen; age, experience, weight, position, ability, strength, skill, ice temperature and more. Approximately 80% of new players have a hollow on their skate that is not the best for them
