Plane the edge of a board. How do you do it?

[Birkelund]

I would need to plane the edge of a three-meter-long and 21 mm thick board so that the angle becomes 45 degrees. How do you do it? A handy man with a sense of precision hand planes. But for the rest of us? Are there any tips, tricks, any machine or tool to use?

 

[daugaard]

maybe with a fräs

 

[KnockOnWood]

Electric planer, perhaps held at a 45° angle?

It's not particularly difficult if you take a little at a time.

 

[Birkelund]

maybe with a router

Do you mean a handheld router?

Electric planer, held at a 45° angle perhaps?

It's not particularly difficult, if you take a little at a time.

Do you hold it 45 degrees freehand, or do you somehow set it to 45 degrees?

 

[KnockOnWood]

...
Do you hold it at 45 degrees freehand or do you set it to 45 degrees somehow?

It's quite easy to work with 0°, 45°, and 90°.
It's something we have built into our brain.

The former technical manager at my job often said that you can see a 2° angle error with the naked eye, when it comes to horizontal and vertical, that is.
And 45° is simply halfway between horizontal and vertical

But of course, you should have a "template" with a 45° angle to check with while you train your eye.

 

[AndersS]

If you have a circular saw, it's easy to get a 45 degree angle. Then it also depends on what you are going to do and how precise they need to be.

 

[Janus82]

I would have chosen a table saw if available. Just tilt the blade and run it through, and it's done in 5 seconds. If you want a perfect finish on the surface, just go over it with sandpaper.