# A 2 to 1 scale is ...? How to build a part on a drawing at a given scale

Sometimes it is not always possible to depict the part on the drawing document in full size. The greatest difficulties are caused by the construction of volumetric parts with large dimensions that go beyond the A1 and A0 formats. Experts use in work more often a scale of 2 to 1. What is it like? Everything is very simple - you need to proportionally increase all the dimensions of the part or any mechanism by 2 times so that they can be better seen on the sheet.

## What is scaling?

To build any drawings, they use as a basis the Unified system for design documentation, where not only the principles of scaling are described, but also the rules for arranging the parts in the drawing, dimensioning, shading, filling in the basic inscription.

The word "scaling" is taken from the German language and means in its original translation "size, dimension". Scales are used to image overall items - aircraft parts,structural elements of residential and public buildings, etc., as well as to increase the small parts - the mechanism of a wristwatch.

M 1: 1 is the real value of the drawn part, and 1: 2 is a 2-fold reduction in the size of the part so that it fits on a sheet of a certain format.

The scale of 2 to 1 is like a visual increase in the natural size of the product by 2 times, so that the production designer can understand how the finished part should look.

The drawing standard from 1968 gives an idea of ​​the existing scales and ways of their construction: 1: 1; 1:75; 1: 500; 1: 1000; 100: 1; 4: 1; 2: 1.

The scale of 2 to 1 is like the smallest of all magnification.

## How to build a part?

For the image elements in the drawing, you need to know or measure their linear dimensions, then multiply them all by two and make a drawing by doubled dimensions. It is important to remember that the size of the corners and the rounding radii do not need to be increased or decreased!

When applying dimensions after construction of the drawing, the natural linear dimensions of the parts are indicated. In order for the designer to understand that the part is intentionally enlarged by 2 times, it is necessary to indicate "2 to 1 scale" in the drawing.This is prescribed in the "Main label" table in the "Scale" section.

If in the drawing only individual elements were enlarged 2 times, then the “2 to 1 scale” is prescribed above the image of these elements - this is an increase of the selected object (see in the figure above).