Technical Information

Vol. 15

HOW TO DRAW AND READ DRAWINGS
When working on machining, you always have to use the drawings.
Proper viewing and drawing of drawings is important for conveying information accurately.
This time, we summarized how to draw and read the drawings.

DESCRIPTION AND NAMES OF THE DRAWING LINES
There are the following four types of lines depending on the shape.
Solid line

Continuous line

Dashed line

A line in which short lines are repeated at regular intervals.

Chain line

A line in which two long and short lines are alternately repeated.

Chain double-dashed line

A line in which two types of length are repeated in the order oflong, short, short, long, short, short.

There are three types of lines depending on the thickness.
Narrow line

In the same drawing,
make the line thickness
uniform for each line type.

Thick line
Extra thick line

The ratio of the thickness of the thin line, thick line, and extra-thick line is 1: 2: 4.

THE USERS OF LINE
Use different types of lines depending on the purpose.The main uses according to the type of line are as follows.
Line Style

Name by Use

The Uses of LineThick solid line

OutlineThin solid line

Dimension line It is used for writing dimensions.
Extension line It is used to draw from a figure to fill in dimensions.
Leader line
It is used for drawing out descriptions and symbols.

Thin dashed line
Or Thick dashed line

It is used for represent the shape of the visible part of the object.

Hidden Outline It is used for represent the shape of the invisible part of the object.

Thin Chain line

Center line
Reference line
Pitch line

It is used for represent the center of the figure.
In particular, it is used to clearly indicate the basis of position
determination.
A reference line that takes the pitch of repeated figures.

Thin Chain doubledashed line

Imaginary line

It is used to display information that is not actually there for reference.

Thin wave line

Break line

A line representing the boundary when a part of an object istemporarily removed.

Thin chain line withthe part which changesof direction

Cutting line

When drawing a sectional view, it is used to show the cutting
position in the corresponding figure.

Thin solid line with
Draw regularlyHatching

It is used to distinguish a specific part of a figure from other parts.
For example, the cut end of a sectional view is shown.

Continue to the next page

HOW TO DRAW AND READ DRAWING (BASIC)
TRIGONOMETRY
In general, mechanical drawings are drawn by trigonometry.

BB

FDCCA
EA
B
C
In the same drawing,AD
F
make the line thickness
Duniform for each line type.
EF
E

Based on the front view
View from right side draws on the rightView from left side draws on the left
View from the top draws above
View from the bottom draws below
This is the basic!

Front View
Plan View
Left-side View
Right-side View
Bottom View
Back Side View

Correct placement drawn with trigonometry

SYMBOL FOR DIMENSIONING USED IN DRAWING
In drafting, use a dimension symbol to clarify the meaning of the dimension by adding it to the numerical value
representing the dimension.
The main dimension auxiliary symbols are as follows.
Description ofnumetrical value

SymbolPurpose of use

DiameterPut it before diameter dimension

RadiusPut it before radius dimension

Diameter of Sphere

Put it before diameter of sphere dimension

Radius of Sphere

Put it before radius of sphere dimension

Sides of Square

Put it before dimension of a side of square

Thickness of Maaterial

Put it before thickness of material dimension

45 degs Chamfering

Put it before 45 degs chamfering dimension

Symbol for dimensioning
represent the shape.

Example of use
DiameterRadiusDiameter of Sphere Radius of Sphere Sides of Square Thickness of 45 degs chamfering
material

This time we explained the terminology, but next time, we will summarize the points to notewhen actually drawing and points to draw easy-to-view drawings.
For More information,please contact
CONIC tool sales desk.