Making an accurate drawing is often time consuming. Therefore, in case of an urgent need to make some part, it is often not a drawing, but a sketch, which is made. It is performed quite quickly and without the use of drawing tools. At the same time, there are a number of requirements that the sketch must meet.
It is necessary
- - detail;
- - paper;
- - pencil;
- - measuring instruments.
Instructions
Step 1
The sketch must be accurate. According to it, the person who will make a copy of the part must get an idea of both the appearance of the product and its design features. Therefore, first of all, carefully examine the item. Determine the relationship between the different parameters. See if there are holes, where they are, their size and the ratio of the diameter to the total size of the product.
Step 2
Determine which view will be the main one and how accurate it gives you about the detail. The number of projections depends on this. There can be 2, 3 or more of them. How many projections you need depends on their location on the sheet. It is necessary to proceed from how complex the product will be.
Step 3
Choose a scale. It should be such that the master can easily make out even the smallest details.
Step 4
Start sketching with centerlines and centerlines. In the drawings, they are usually indicated by a dotted line with dots between strokes. These lines indicate the middle of the part, the center of the hole, etc. They remain in the working drawings.
Step 5
Draw the outer contours of the part. They are indicated by a thick continuous line. Try to accurately convey the aspect ratio. Apply the inner (invisible) outlines.
Step 6
Make incisions. This is done in exactly the same way as in any other drawing. The solid surface is shaded with oblique lines, the voids remain unfilled.
Step 7
Draw dimension lines. Parallel vertical or horizontal strokes extend from the points between which you want to mark the distance. Draw a straight line between them with arrows at the ends.
Step 8
Measure the part. Specify the length, width, hole diameters and other dimensions required for accurate work. Write the dimensions on the sketch. If necessary, apply signs indicating the methods and qualities of treatment of various surfaces of the product.
Step 9
The last stage of work is filling the stamp. Fill in the product details. In technical universities and design organizations, there are standards for filling stamps. If you are making a sketch for yourself, then you can simply indicate what kind of part it is, the material from which it is made. The person who will make the part should see all other data in your sketch.
