# 机械制图确实是每个机械设计师都必须掌握的基本技能

**URL:** <https://www.cax.do/t/mechanical-drawing-is-indeed-a-fundamental-skill-that-every-mechanical-designer-must-master/84>\
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**Tags:** machnical\
**Created:** [2024 年11 月 1 日 13:01 UTC](https://www.cax.do/t/mechanical-drawing-is-indeed-a-fundamental-skill-that-every-mechanical-designer-must-master/84 "2024-11-01T13:01:04Z")\
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作者： ![Max](https://www.cax.do/user_avatar/www.cax.do/max/32/257_2.png) [@Max](https://www.cax.do/u/Max)\
发布日期： [2024 年11 月 1 日 13:01 UTC](https://www.cax.do/t/mechanical-drawing-is-indeed-a-fundamental-skill-that-every-mechanical-designer-must-master/84/1 "2024-11-01T13:01:04Z")

</div>

### 1. Basic Knowledge of Projection

1. **Central Projection** : The light source emits from the projection center.

2. **Orthographic Projection** : When the projection rays are parallel and perpendicular to the projection plane, the resulting projection on the projection plane is called orthographic projection.  

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### 2. Three Views

The three main projections of an object form a view that accurately reflects the object’s length, width, and height dimensions. This engineering drawing (comprising the front view, top view, and left view) is an established abstract representation of the object’s geometric shape in engineering.

1. **Front View** :

2. **Top View** :  

3. **Left View** :  

4. **Summary of Projection Surface Expansion** :

5. **Projection Characteristics of Planes and Lines on the Object** :

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### 3. Various Methods of Expressing Parts

There are several methods to express the shape of parts:

1. **Basic Views** :

2. **Inclined View** :

3. **Partial View** :

4. **Revolved View** :

5. **Sectional View** :

6. **Coinciding Section** :

7. **Local Enlarged View** :  

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### 4. Basic Steps in Drawing

1. Determine the drawing size and scale (product size and structure).
2. Draw the frame according to specified dimension requirements.
3. Plan views: Distribute views based on product size and structural complexity, especially the number and distribution of sectional views and technical requirement locations, leaving space for the title block.
4. Analyze the product and draw.
5. Dimension labeling.