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Step 1: What is a jointer?
Understand what a jointer is: a machine for leveling off pieces of rough wood.
Step 2: Locate the high corners
Determine the high corners of the planks and mark them–these are the points where you will apply the most pressure to level them out.
Use a push pad to apply pressure to the front of the plank and a push stick to apply pressure to the back and to guide the plank along.
Step 3: Checking the height difference
Before cutting, make sure the difference between the two table heights is where you want it. Also, the fence should be at 90 degrees. Lock all adjustments in place. Repeat the same process with the edges and use an engineer’s square to ensure levelness.