When performing a technical drawing, it is quite often necessary to deal with the image of standard fasteners. Many of them have threads, which you have to depict in the drawing. The main parameters of the thread include the outer and inner diameters, as well as the pitch.
It is necessary
- - paper;
- - compasses;
- - ruler;
- - pencil
- - bolt standards table.
Instructions
Step 1
Select the outside diameter of the thread. In technical documentation, it is usually denoted as d without an index. It is equal to the diameter of the cylinder on which the thread is applied. The inner diameter is d1. Both the length of the cylindrical part and the size of the area where the thread is applied are important
Step 2
The cylinder depicted on the plane looks like a rectangle. Draw the cylindrical portion of the bolt. The width of the part is equal to the diameter of the cylinder, and the length corresponds to the length of the part. Draw a center line by halving the short sides of the rectangle.
Step 3
Along the long sides from one end, set the length of the thread aside. Place dots and connect them with a thin line. From the point of its intersection with the middle line, set aside in both directions a size equal to half the inner diameter. Do the same on the short side, which is the start of the thread. Connect the obtained points in pairs with thin lines. Both thread diameters must be specified in the drawing.
Step 4
This method is used to draw a projection in which a cylindrical bar is visible on the fastener. Other projections may show, for example, the head of a bolt or screw. Draw a hat of the desired shape and define its center. Place a compass needle at this point and draw a circle whose radius is equal to the outer radius of the thread. Draw a second circle from the same center. Its diameter should be equal to the inner diameter of the thread, which is indicated by a thin line. Mark both diameters in the drawing. The line that draws the inner circle is usually not closed
Step 5
The thread can also be internal. Draw a hole on the corresponding projection of the part. As in the first case, on some projections it will look like a rectangle, on others it will look like a circle. The thread in the same way has two diameters, while the internal will in this case be larger than the external. Draw a rectangular cylindrical hole. Its width corresponds to the outer diameter of the thread. Draw the middle line in the same way as in the first method. From the intersection points, set the size of the inner radius on both sides. Set aside the same segments along the line of the beginning of the thread. Connect the dots in pairs using thin lines
Step 6
On the projection where the hole should look like a circle, draw a circle of the corresponding diameter and circle it. From the same center, draw a second circle with a thin line, the radius of which is equal to the inner radius of the thread.
