The best way would be to joint 1 face and 1 side of the board, then plane the opposing face of the face you jointed, then use your table saw to trim the opposing side of the jointed side. Once you’ve done this, then you can use a miter saw on the ends and, if done correctly, your board will be square.
But I don’t know what all tools you have at your disposal.
How well did you tune your table saw?
Are you starting with a S4S board?
I'm not touching an electric handheld planer here because that is just beyond my brain's ability to handle.
Stumpy nubs has a good video on flattening a board with an power hand plane: [https://www.youtube.com/watch?v=FfgEVSBD2E4](https://www.youtube.com/watch?v=FfgEVSBD2E4)
It's basically the same as doing it with a regular hand plane. You need winding sticks.
Makes sense if the OP is flattening or jointing a board. Perhaps the OP misunderstands the term square?
Do need a flat surface to reference before anything can be squared.
You need a flat reference to get a flat edge. I have a jug that I use to joint boards and thickness them to get two flat sides. Then I table saw and thickness the other sides.
Electric hand planes are generally a terrible choice for squaring anything. Not impossible But the easiest to screw up.
I just use a number 5 and number 8 hand plane. I never wanted to spend the money on a jointer and I didn’t use to have the space for one.
The process is:
-Flatten one face. Use winding sticks to check for twist as you do this.
-Flatten one edge, use machinist square to check that it’s 90 degree to the face you flattened.
-Use a marking gauge set to your desired width and run it along both faces using the flattened edge as a reference. Then plane the other edge down to your marked lines
-Use a marking gauge set to your desired thickness and make marks on both edges using the first face you flattened as the reference. Flatten the second face to these lines.
Takes some practice.
The most common way is a jointer and a thickness planer (not a hand planer)
The best way would be to joint 1 face and 1 side of the board, then plane the opposing face of the face you jointed, then use your table saw to trim the opposing side of the jointed side. Once you’ve done this, then you can use a miter saw on the ends and, if done correctly, your board will be square. But I don’t know what all tools you have at your disposal.
How well did you tune your table saw? Are you starting with a S4S board? I'm not touching an electric handheld planer here because that is just beyond my brain's ability to handle.
Stumpy nubs has a good video on flattening a board with an power hand plane: [https://www.youtube.com/watch?v=FfgEVSBD2E4](https://www.youtube.com/watch?v=FfgEVSBD2E4) It's basically the same as doing it with a regular hand plane. You need winding sticks.
Makes sense if the OP is flattening or jointing a board. Perhaps the OP misunderstands the term square? Do need a flat surface to reference before anything can be squared.
Take the time to square up your table saw.
You need a flat reference to get a flat edge. I have a jug that I use to joint boards and thickness them to get two flat sides. Then I table saw and thickness the other sides. Electric hand planes are generally a terrible choice for squaring anything. Not impossible But the easiest to screw up.
I just use a number 5 and number 8 hand plane. I never wanted to spend the money on a jointer and I didn’t use to have the space for one. The process is: -Flatten one face. Use winding sticks to check for twist as you do this. -Flatten one edge, use machinist square to check that it’s 90 degree to the face you flattened. -Use a marking gauge set to your desired width and run it along both faces using the flattened edge as a reference. Then plane the other edge down to your marked lines -Use a marking gauge set to your desired thickness and make marks on both edges using the first face you flattened as the reference. Flatten the second face to these lines. Takes some practice.