What is 1st angle projection?
First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years. In Australia, third angle projection is the preferred method of orthographic projection.
Why do we use 1st and 3rd angle projection?
Europe had used the method of first angle projection in creating orthographic views of three-dimensional parts for manufacturing for many decades, while in the U.S., engineers had settled on using third angle projection with its more logical placement of views.
What are first and third angle drawings?
The difference between first and third angle projection is in the position of the plan, front and side views. In third angle, what you see from the right would be drawn on the right. In first angle, the view from the right would be projected through and drawn on the left.
What are the 3 planes of projection?
[FIGURE 3-2] Projections of the point are made onto three of the surfaces that make up the box: the top or “H” (horizontal) plane, the front or “F” (frontal) plane, and the right side or “P” (profile) plane.
Who Uses first angle projection?
Orthographic Representation Third angle projection (figure 1.2) is used mainly in The United States and Canada whilst first angle projection (figure 1.1) is used mainly throughout Europe and the rest of the world.
What are the three regular views?
Typically, an orthographic projection drawing consists of three different views: a front view, a top view, and a side view. Occasionally, more views are used for clarity. The side view is usually the right side, but if the left side is used, it is noted in the drawing.
Where do you put hidden lines?
Hidden lines are used to show surfaces that are not directly visible. All surfaces must be shown in all views. If an edge or surface is blocked from view by another feature, it is drawn using a hidden line.
Why are three views used to show the object?
Complex designs require a three view orthographic drawing. Show the object as it would appear to a person looking directly at the object. They are commonly used to communicate designs to people who do not understand or use orthographic drawings. The most common type of pictorial drawing used.
Are orthographic views in 2D or 3D?
The orthographic projection is derived from the principles of descriptive geometry and is a two-dimensional representation of a three-dimensional object. It is a parallel projection (the lines of projection are parallel both in reality and in the projection plane).
What is a view projected from a primary view called?
A view projected from a primary auxiliary view is called a. front auxiliary view.
What font is used in engineering drawings?
Gothic sans-serif script
What are sketches or technical drawings called in engineering?
Technical drawing, also known as drafting or draughting, is the act and discipline of making detailed drawings. These drawings visually communicate how something works or how it is to be made.
What are three standard components of a drawing sheet?
Information Usually Included in a Parts List:
- Name of the part.
- A detail number for the part in the assembly.
- The part material (such as cast iron or bronze)
- The number of times that part is used in the assembly.
- The company-assigned part number.
- Other information, such as weight, stock size, etc.
What are the three types of working drawings?
Below are the different types of construction drawings.
- 1 Architectural Drawings: This is one of the types of construction drawings.
- Structural Drawings:
- Electrical Drawings:
- Plumbing and Sanitary Drawings:
- Finishing Drawing:
Where is the title block on a drawing?
Generally, the title block is placed in the lower right-hand corner of the drawing sheet, regardless of the size of the drawing (except for vertical title block).
How do you read a production drawing?
The following information is located within the title block in the lower right hand corner of a blueprint as shown above:
- Name: company or agency who prepared or owns the drawing.
- Address: location of the company or agency.
- Name and date: responsible engineers who drew, checked, and approved the drawing.
What is meant by production drawing?
Production drawings (sometimes called working drawings) are complete sets of drawings that detail the manufacturing and assembly of products (as distinct from engineering drawings prepared by and/or for production engineers whose task is to decide how best to manufacture the products).
What is design and drawing for production?
Design and Drawing for Production (DDP) is an approved course to meet the one unit of art/music requirement for graduation for all students, in addition to approved art education course or a CTE sequence. To fulfill this requirement, the course of study must use the State developed DDP syllabus in its entirety.
What are the four types of technical drawing?
There are many types of technical drawings, including: 3D drawings (isometric, perspective) • Exploded-view 3D drawings • Complete working drawings • Detail drawings (2D orthogonal projections) •Diagrams are another form of technical drawing with looser, less universal standards.
How do you read drawings?
Start by looking at the Title Block on each drawing. Located in the lower right of the drawing, the Title Block contains the architect or designer’s name, the drawing number, project name, part number or building address and the scale of the drawing. This will help you understand what you’re looking at.
How do you read a CAD drawing?
Reading CAD drawings is a lot easier than you think.
- Look at the legend. The legend or key, usually located near the lower right-hand corner of the drawing, should explain all of the symbols on the drawing.
- Look at the title block.
- Read the notes.
- Pay attention to lines.
Is AutoCAD easy to learn?
Many people think that learning AutoCAD is hard. Yes, there are many things to learn. But using AutoCAD is not difficult. The key is you need to learn one step at a time.
How can I teach myself AutoCAD?
The best way to start learning AutoCAD on your own is to find an online course or tutorials that best suit your learning preferences and needs. For example, if you’re dominantly a visual learner you may want to start with YouTube video tutorials or enroll an online course with lots of video materials.
What are the basic commands in AutoCAD?
Basic actions
| SHORTCUT/ COMMAND | DESCRIPTION |
|---|---|
| CO/ COPY | Copy objects or text |
| DI/ DISTANCE | Find the distance between two point in a drawing |
| I/ INSERT | Insert (existing block or drawing as a block) |
| LIST | Access the properties of the different objects within a drawing |