Skate Sharpening for Minor Hockey: Bite, Glide, Weight, Ice, and the Flat-Bottom Alternative
Most hockey players skate on a hollow nobody chose — the shop’s default, an older sibling’s cut, whatever was on the steel when the skates were bought. Almost nobody picked it on purpose, because almost nobody is walked through what the number does.
This report explains it. The hollow is the groove ground along the bottom of the blade. Its depth is a few thousandths of an inch — and it decides how hard a player’s edges bite and how freely the blade glides.
The findings:
0.0044 in to 0.0016 in
the groove depth from the deepest common hollow (3/8 inch) to the shallowest (1 inch), computed from the geometry of the cut on standard hockey steel. One step — 1/16 inch of radius — is the smallest change a skater can judge fairly.
11% and 19%
how much lower blade friction measured at a 1/2-inch and a 3/4-inch hollow than at a deep 1/4 inch, in University of Calgary sled tests (Federolf and Redmond, 2010). Deeper grips; deeper also drags, on every stride, in numbers.
Weight decides first
A light player’s weight cannot drive the edge in, so the geometry must supply the grip: light beginners start around 7/16 to 1/2 inch. A heavy player’s mass supplies the penetration, so the cut should get out of the way: heavy, skilled skaters settle around 11/16 to 7/8 inch. A European rule published by ProSharp — body weight in kilograms divided by pi — returns about 7/16 inch for a 75-pound player, and the report’s chart combines weight and skill into one starting point.
The ice gets a vote
Hard hockey ice (17 to 23 degrees Fahrenheit, per sharpener manufacturer Wissota; most rinks target about 25) needs one step deeper. Soft ice needs one step shallower. No published source states a hollow change per degree — the adjustment is one step, not a formula.
Too deep is a failure of its own
An edge cut too deep catches in stops, comes out of transitions in segments, and punishes strong, heavy skaters most, because their power drives the edge past its working depth. Shallow does not mean losing your edge — an edge holds when it is loaded well, at any cut.
Flat Bottom V:
The alternative geometry replaces the round groove with a flat channel: glide like a shallower cut, bite like a deeper one. It softens the trade-off; it does not repeal it. One caution the report states plainly: Blackstone, the maker, publishes only three reference points for how FBV cuts compare to traditional hollows — the fuller charts come from dealers, and on one cut (90/50) the maker and a widely used dealer chart disagree outright. Both are printed in the report.
Execution matters more than the number:
A perfect hollow with uneven edges skates worse than a wrong hollow done right. Level edges come first, a clean honed finish second, and frequency third — published guidance runs from every 2 to 3 hours of ice to every 10 to 20, and every figure at the frequent end comes from a company that sells sharpening. The reliable guide is symptoms, not the calendar.
Our own experience with FBV, from the report: two years on flat-bottom cuts, with limited to no downside — and a U11 AAA player switched just under a year ago who holds a strong edge and works less hard to find his glide. Just our experience.
What this means for your player (summary of the report’s application section):
Start from the weight-and-skill chart, not from what anyone else uses. Change one step at a time and judge over two or three skates. Read the symptoms in the right direction: losing edges in tight turns on hard ice means one step deeper; sticky transitions and chattering stops mean one step shallower; one skate feeling different from the other is not a hollow problem at all — ask for an edge-level check.
Caveats
One controlled study exists — Federolf and Redmond (2010) — and it measured friction on a sled and times on an agility course, not game performance; between 3/8 and 7/8 inch it found no general performance effect, and the best cut differed by player. The geometry is computed for standard 2.9 mm steel; wider steel changes the numbers. FBV equivalences come from two charts that disagree in one place, and both are printed. Full caveats are on page 11 of the report.
Modern Hockey Training and the Ultimate School Experience for grades 4-8 kids.
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