The measurements placed on a picture are important in terms of the healthy work of the part, specifying the largest and smallest values in the measurements obtained by the worker at the time of construction. In particular, the measures to be placed on the pieces to be fought together must also indicate the characteristics of the hanging and the task. These properties are indicated by tolerance and exercise marks.
The main dimensions given on the picture are not fully acquired, even by using special tools, work molds, automatic machines, gauges and very skilled workers. The resulting measure will be either slightly larger or slightly smaller than the value of the image. Although several of the same parts are made by the same measuring tools and spring m workers, they all have the differences that can be measured by the at multiples of the millimeter between each measure, even when measured separately with the same measuring instrument. So the measurements given on the picture cannot be fully achieved on the job. Trying to get a lot of unnecessary expenses. Therefore, each measure must carry the tolerances that indicate a number of errors that will not cause any drawbacks in the operation of the part. Thus, the task of selecting a number of faults permitted in the construction of the part is loaded on the shoulders of engineers, technicians, and constructions. Very large deities in the dimensions, so small error shares require extra expense, the constructor will refrain from very close error shares, but will not allow too much tolerance considering the task of the part.
The membrane of the production of spare parts that can be exchanged with each other constitutes the most important reason for specifying tolerances on measurements. Because a broken part of a machine can be removed and replaced with the same characteristics and readily available as ready from the market, the possibility of making the machine work immediately is ensured. Without the construction of spare parts, a modern industry cannot exist. Without the To-do dimensioning, spare parts cannot be made. Because in other places, parts of the same tamlım by other individuals can only be obtained by tolerances.