Dimensions are the defining parameters of an object. The fewer dimension lines and numbers, the better. But the sum of the values is needed for modeling and quality control. For the sample, the following types of dimension lines are used:
overall dimensions demonstrating the boundaries of the object;
installation, connecting and seating values, with the help of which they make the installation and installation of the object and elements;
reference dimensions included in the inscriptions for formal information.
Methodology regulates the writing of numbers and metric tolerances. They cannot be duplicated for the same subject on different pages of the sample, except for formal information. The dimension line is parallel to the measured segment, and the offset is perpendicular to the line. When measuring angular values, the line becomes a semicircle, and offsets become radii. Leads, contours and lines do not intersect. Short rulers are set closer to the object, and long ones further.
Position and Part Numbers
The numbering of positions and associated icons is regulated by methodology. If the product exposition contains constituent elements, then they are numbered in order (pos. 1, pos. 2, etc.). Numbers are written on special lines that are drawn from the inner silhouette of the object beyond its limits, on the cut or section where the position is visible. For convenience, all position numbers are combined in a tabular register, in the free space of the composition or on separate pages. The sequence of the registry columns:
finished and borrowed parts;
purchased items;
novelties.
Main inscription
Methodology regulates the design of the main inscription on the sample. It contains:
product title;
sheet code according
material code;
letter according
product weight;
scale;
page number;
number of pages;
name of company;
job title;
surname;
signature;
date.
Compliance with all the rules for the execution of a general view drawing is necessary. It is it that will help to show the designed product and make it understandable for specialists in all industries.
For control, as well as the assembly process, assembly drawings are used. Their number should be sufficient for all products, but at the same time the smallest. First of all, assembly drawings are used by technologists who develop the technological process of the assembly operation. Also directly workers who assemble products or their components according to assembly drawings.
Assembly drawings are usually used for large-scale and serial production. It must certainly show every detail of the object under study. In other words, the master, looking at the drawing, must mentally realize what part he will need to make and which part is best to start with. An assembly drawing necessarily comes with a specification in which all parts will be numbered, as well as all dimensions and materials and other properties are carefully described.
General arrangement drawing detail
This is a process where, using a general arrangement drawing, working drawings of the parts that make up this product are made.
The detail drawing has the following sequence:
On the drawing you need to find the necessary detail;
Conduct a study of the external and internal shape of the part;
According to the drawing, write out the overall dimensions, but only taking into account the scale;
Choose the number of images for the part, so that it is clear what shape and size it is. The number needed is the smallest;
Decide on the format of the sheet, based on the complexity of the part, its overall dimensions and scale;
Working drawings must be drawn up for absolutely all the parts that are part of the product.
Before proceeding with detailing, it is necessary to analyze the assembly drawing, find the details in all its projections, figure out how they interact with each other and what is their function in the product. When detailing, the details should be drawn on a scale of 1: 1. If the detail is too large, then just zoom out. Similarly, it is done with small details, increasing their scale so that the detail is easy to read.
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