Since labor initiated the history of human civilization, graphics, like languages and words, have been basic tools for people to understand nature, express and exchange ideas. Bearing drawing has wide applications in the history of graphic development through continuous improvement and development. Therefore, bearing drawings are an essential step in the production of bearings
As shown in the figure below, a complete size should generally include size numbers, dimension lines, extension lines, and arrows or diagonal lines that indicate the end of the dimension line.
Normally, designers mark the dimensions of linear dimensions above the dimension line. Also, it allows marking on the break of the dimension line.
Drawing the bearing dimension line with a thin solid line only. Generally, they must not coincide with other lines or draw on their extension lines. While dimensioning a linear dimension, the dimension line must be parallel to the dimensioned line segment. If there are several parallel dimension lines, the large dimension should be outside the small dimension to avoid the dimension line intersecting the dimension line.
When dimensioning a circle or radius on a circle or arc, the dimension line should generally pass through the center of the circle or extension. The terminal of the dimension line has two forms, as shown in the figure: the arrow is applicable to various types of patterns, b in the figure is the width of the thick solid line. The oblique line is drawn with a thin solid line, and h in the figure is the font height. Make the end of the circle diameter, arc radius, and angle dimension line like an arrow. When using the slash form, the dimension line and the extension line must be perpendicular to each other.
If you want to draw the extension line, use the thin solid line. In addition, draw the extension line through the outline, axis, and the centerline of a figure. It is also possible to use a contour line, an axis or asymmetrical center line as the extension line. Generally, the extension line is perpendicular to the dimension line and beyond about 2 mm with the end of the dimension line.