The true size of a mechanical part is based on what is on the drawing
The most accurate size is dimensioning! You can't draw correctly, but as long as the marking is correct, the processing is in accordance with the dimensioning!
The size of the machine parts shall be in accordance with the size of the drawing as specified on the drawings, and be sure to differ from the marked sizes on the package, especially the irregular parts.
The actual size of the machine parts is based on the numerical values of the drawings.The basic rules of dimensioning in mechanical drawings, such as:
