How to Use a Can Opener
A can opener seems foolproof until the wheel slips off the rim halfway through, the lid drops into the food, or the cut edge comes out jagged enough to slice a finger. Getting a clean, safe cut comes down to how the opener is clamped on and how much downward pressure is applied while cranking.
Steps
- 1Wipe down the cutting wheel and gears with a damp cloth if the opener hasn't been used recently; dried food residue makes the wheel skip instead of bite into the metal.
- 2Set the can upright on a flat, stable surface like a cutting board or countertop rather than holding it in the air.
- 3Open the handles of the opener as wide as they go and hook the cutting wheel over the rim of the can, positioning it just inside the raised lip at the very edge.
- 4Squeeze the handles together firmly until they lock closed, clamping the opener onto the rim. This first squeeze should feel snug, not loose.
- 5Turn the crank or key clockwise with steady, even pressure, letting the wheel pull the opener around the rim on its own rather than forcing it forward.
- 6Keep light downward pressure on the handles as you crank; if the wheel starts to ride up and slip, stop, reopen the handles, and reclamp it slightly lower on the rim.
- 7Continue cranking until the opener has traveled the full circle and the resistance suddenly drops, signaling the cut has met its starting point.
- 8Open the handles to release the opener, then lift the lid out using the opener's built-in magnet or lip if it has one, or the flat side of a butter knife, keeping fingers away from the cut edge.
Common mistakes
- Clamping the wheel too far onto the can's side instead of on the rim, which cuts through the label and dents the can instead of separating the lid.
- Cranking fast without downward pressure, causing the wheel to skip and leave a half-cut, jagged edge that's hard to pry open.
- Grabbing the lid by its edge with bare fingers, when both the lid and the newly cut rim of the can are sharp enough to cause a real cut.
- Using a top-cut opener like a side-cut opener (or vice versa): top-cut openers grip the top lip and leave a razor edge, while side-cut openers grip the side seam and leave a smooth, rounded edge.
Equipment
- Manual rotary (butterfly-style) can opener
- Cutting board or flat countertop
- Kitchen towel for extra grip on a stiff crank
- Butter knife or magnetic lid lifter (optional)
FAQ
What's the difference between a top-cut and side-cut can opener?
A top-cut opener punctures and cuts along the top lip of the can, leaving a sharp-edged lid that sits loosely on top. A side-cut opener grips the side seam below the rim and cuts the entire top off in one smooth, rounded piece with no sharp edge, which is safer for reuse or for pets eating straight from the can.
Why does my can opener keep slipping off the rim?
Slipping usually means the wheel is dull from dried food buildup or the handles weren't squeezed fully closed before cranking. Clean the cutting wheel with a toothbrush and make sure the handles lock all the way shut before turning the crank.
Is it safe to use a can opener with visible rust on the blade?
No. Rust on the cutting wheel can transfer tiny flecks onto the cut edge of the lid and contaminate the food inside. Replace a rusted opener rather than trying to clean it, since the pitting in the metal holds moisture and will rust again quickly.
How do I open a can if the crank won't turn at all?
Reopen the handles fully, reposition the wheel slightly further onto the rim, and reclamp before trying again. A crank that won't budge is almost always clamped too loosely or caught on a dent rather than actually stuck.
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