Ryobi power planer blades are reversible; you get two blades for the price of one. When the blade becomes dulled, switch it over and use the other side. Blades for the Ryobi planers come in pairs; always switch them out or reverse them in pairs. Unlike old hand-planer blades, you can't sharpen Ryobi blades, so replace them when they appear damaged or chipped. Ryobi manufactures hand planers and stationary thickness planers; the procedure for removing blades on them are different.

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Hand Planers

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Step 1

Unplug the planer—a basic safety rule for hand tools, particularly one with a blade.

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Step 2

Turn the planer upside down and secure it as well as possible. If you have a wooden vise, put the tool in that and tighten the vise enough just enough to hold it. Don't put the tool in a metal vise -- you can crack the housing.

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Step 3

Loosen the three screws that secure the blade. (Your planer should have come with a wrench to do this; check the box.) Just loosen the screws—don't remove them.

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Step 4

Look at the direction of cut and make a mental note. Then observe and replicate the tapering of the blades. Place the tapered edge of the new blade on the same side as the screw heads; the flat edge faces the cutter block.

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Step 5

Push the blade out of the blade holder with a flat-head screwdriver—it should go to the right.

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Step 6

Remove the old blade. If necessary, tap the blade with a block of wood to loosen it.

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Step 7

Slide the new blade, then orient and center it using the screwdriver. Retighten the three screws.

Step 8

Repeat with the second blade.

Thickness Planers

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Step 9

Unplug the planer. Remove the chip guard from the infeed side of the machine by unscrew the two wing nuts securing it.

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Step 10

Loosen the lock bar holding the blade in place by turning the two lock bar screws on the side of the machine counterclockwise, using a screwdriver. The blade is spring-loaded and pops out when you do this. Pull it out of the planer, then pull out the lock bar.

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Step 11

Set the lock bar back in place against the cutter head and position the blade against it.

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Step 12

Tighten the lock screws on the side of the machine to hold the blade in place.

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Step 13

Reinstall the chip guard and tighten the wings screw holding it.