We try, we try, but it turns out crooked? It's just that there is a crooked tool in stores: I tell you how to choose it

Hello, friends.

I will not go into details. The bottom line is this: you had to be a bit post-polar, but you don't have the instrument with you. We stopped on the way to a hardware store. For half an hour, they chose a square and a tape measure with a ruler from the garbage that lies on the shelves. I'm not exaggerating - 30 minutes.

If they took the first instrument that came to hand, they would not be able to do anything good. Let's tell you what to look for.

Choosing a square

First and foremost - the angle must be 90 degrees. Unfortunately, this is not always the case. The check is very simple:

1. We apply a construction square to a surface with an even edge: a tabletop, a board, as a rule, any panel with a factory edge.
2. We draw a line.
3. We turn the square 180 degrees and draw another line (they should match).

Second thing to look out for - measuring scale. It should start from the origin.

Here, for example, the divisions are shifted by 1 mm. If you use a square only to measure an angle of 90 degrees, it's okay. But it will not work to make accurate markings on such a scale.

Choosing a ruler

A common jamb in the production of rulers is the offset of the origin. Often a millimeter and a half from the beginning is simply cut off.

Another important criterion for me is the coincidence of the calibration of the measuring scales on all the instruments that I use. It is not so important that these scales correspond to a certain standard. But they must coincide with each other.

Choosing a roulette

I am not going to discuss now all the selection criteria. We are talking about the accuracy of measurements. To do this, it is enough to do two steps:

• I put the hook of the tape measure on the zero of the ruler. The divisions are the same - excellent.
• I push the tape against the table with my tongue. I put a ruler next to it. The scales coincide - you can work.

Due to incorrect positioning of the toe, the measurement accuracy may vary by several millimeters. In a rough finish, this is often not important. When it comes to carpentry, such an error can play a cruel joke.

Check the tool before buying and you will be pleased to work with it. I wish you all success. If the material was helpful, don't forget the thumbs up.Subscribe to the channel here.