How to Straighten a Warped Board Without a Planer / Jointer

In this article I will show you how to flatten a board without a planer / jointer. All you need is a table saw and a very simple jig. To make the jig you will need two very straight boards in which you have to cut many holes. The photos are for demonstration only, I used bad scrap material, but you have to use perfectly straight wood.

Then you have to make special wooden clamps. Cut two pieces of wood about fifteen centimeters long. Drill two holes in each piece.

Then you have to make the knobs of the clamps.

I cut a few circles and put special nuts on them.

These are all parts of the clamp.

After assembly, the clamp looks a bit like a toy car.

This is the board that I will flatten, you can see that it is quite curved and also the surface is dirty and rough. 

To flatten the board, simply place it between the two boards with the holes. Then tighten all the boards with the clamps we made, it is important to place the clamps in the holes and not on the outside of the boards.

Adjust the saw blade to appear only one millimeter above the table. 

It is very important to be no more than that, because it is very dangerous.

Start the machine and slide the boards on the table across the disc. Looking through the holes in the boards, try to slide only the middle board on the blade. It's not a problem if the disc affects some of the other boards, but avoid doing it too much because you will use them the next time you want to straighten a board.

See how the blade removes material from some places.

Depending on the board, you may need to pass several times. Do not lift the blade, instead release the clamps and press the board down, then tighten them again. This is the final result, the board is quite straight, but the surface is not very smooth, with a little sanding it will become perfect.