# Tip 1: How to draw spring

Springs - common elements of different instruments, apparatus, machines and other installations.Therefore, when creating technical documentation of these devices, it is necessary to draw the spring.
you need
• - pencil;
• - line;
• - gum;
• - compasses;
• - Calculator;
• - paper.
Guide
1
In most cases, using coil springs with a circular cross-section.Such springs tend to have standard dimensions.The image is executed in real dimensions or in a reduced or enlarged, which must be indicated in a box "Scale".
2
Schematic representation of the springs is used only on the assembly drawings.All these factors necessarily consider at the stage of preparatory work prior to the construction of the drawing spring.
3
To mark centering compression spring at its ends picture the bearing surfaces (most of the springs have a half round support).However, in order to properly construct the drawing springs, it is necessary to know its main parameters: an outer diameter, number of turns, wire diameter
and pitch of turns.
4
number of active coils rounded to a value that is a multiple of 0.5.Calculate the length of the spring by the formula: H0 = n * t + d, where n - the number of turns t - track pitch, and d - wire diameter.
5
Find the total number of turns on the following formula: n1 = n + 1,5 (one and a half, this formula takes into account the reference coil).
6
length of the spring with a hook calculated using the formula: H0 '= H0 + 2 * (D - d).Then find the bending radius oboznalsya letter R: R = (D + 2 * d) / 2.
7
the drawing picture a spring in a free state, that is, based on the condition that shows a detail does not feel the pressure from the outside.Drawing on the sheet must be positioned horizontally.
8
Circuit turns draw a simplified straight lines.
9
incision helical springs is a section of turns, and if the thickness of the section turns less than two millimeters, the section of each coil in the image of the spring in section fully fill a dark color, but if the thickness of the section of coil is less than 1 mm, thea cross-sectional schematic.

# Tip 2: How to draw a tree

Novice designers in the production of matter, as a rule, give the test task to draw a tree.It is not the most difficult but many can not cope with it.
Guide
1
In order to draw a tree, it is necessary to have a visual image from the specified dimensions.Drawings were made in three intersecting planes A, B and C.

First, draw the main tree species, respecting the scale of 1: 1 format by AZ arrow A. In one of the cylindrical necks of the shaft provides for a special groove that will be required to exit the grindingcircle.For her follow callout.The size and shape of the grooves set in accordance with GOST 8820-80.Will directly determines the size of the diameter of the shaft on which the groove.
2
order to subsequently assemble the product in a production environment, follow the bevel on the ends of parts.At one end of the shaft to draw a chamfer angle of 45 ° and designate, for example, 2 × 45 °.
3
Then follow the local sections.This must be done for dimensioning and determination of the internal structure.
to transmit torque to the gear shaft, apply the key, which is installed directly into the keyway.We select the size of the keyway according to GOST 23360-78.They depend on the diameter of the shaft.To explain the shape of the slot apply a plan view and cross-section.
4
Perform three section.In continuation of the track position the cutting plane plane-section Cross-section plane B make a blank area of ​​the drawing.And finally, the section plane B will be in communication projection.
5
Apply dimensions required for the manufacture of parts.Follow designation according to GOST 2.305-68 images.
6
Under "material" title block and enter the GOST mark the material from which the shaft is made.
7
Technically figure does not simply reproduce the visible form of the depicted object, but keep it under constant control of the special direction of thinking.In other words, do not forget and consciously use the features of construction, which are characteristic of axonometric.This is the location axonometric axes, performance and other distortions.
8
And another important point: remember the direction of the main view to select the type and position of the cutting plane.
applying in practice these simple and consistent advice, you can easily cope with the task in front of you and draw a tree without any difficulty.
Note
In the construction drawing of the spring, be extremely careful guided by the calculated values.