How to read an engineering drawing ?

Best answer:

1. . Visible line: Indicates an edge is visible in relevant view.
2. . Hidden line: Indicates the edge is behind a face.
3. . Phantom line: Mostly used to indicate an alternate position of a moving part.
4. . Centre lines: drawn to indicate the exact geometric centre of the assembly.

FAQ

What are the 4 basic components of an engineering drawing?

1. What is Engineering drawing?

1. Orthogonal views.
2. Dimensions.
3. Scale.
4. Projection.
5. Drawing Standards.
6. Name/ Title of the drawing.
7. Tolerances.

How do you read and interpret drawings?
Follow projection lines to read most dimensions. Lines drawn up or down indicate length and width, while those out to the side indicate height. Some drawings might place the dimensions directly on the side of the object if it’s clear in the drawing what side that dimension refers to.

How do you read a machining drawing?
It can be shown as 1:1 or 1=1. The first number represents the actual size of the part and the second number represents the print. In other words, 1:2 means the the print is double the actual size. Whereas 3:1 indicates the actual size is three times what is shown on the print.

What is the 3 most important parts of an engineering drawing?

1. Geometry – the shape of the object; represented as views; how the object will look when it is viewed from various angles, such as front, top, side, etc.
2. Dimensions – the size of the object is captured in accepted units.
3. Tolerances – the allowable variations for each dimension.

What are the 5 types of technical drawing?
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 master a engineering drawing?

1. Tip #1: Dimension only critical & measurable features.
2. Tip #2: Communicate hole tapping needs with thread size and depth.
3. Tip #3: Consolidate call-outs when multiples of the same feature exist in a view.
4. Tip #4: Communicate assembly intent of critical features.

What are the symbols used in engineering drawing?
Basic types of symbols used in engineering drawings are countersink, counterbore, spotface, depth, radius, and diameter. Here are more commonly used engineering drawing symbols and design elements as below.

How do I read AutoCAD drawings?

1. Click File > Open > Browse.
2. Next to the File name box, click the All Visio Files dropdown, and then select AutoCAD Drawing.
3. Find the . dwg or . dxf file on your computer, and then double-click it to open it. The AutoCAD file will appear as a new Visio drawing.

What are the lines used in engineering drawing?

1. A type – Continuos Thick.
2. B type – Continuous THIN.
3. C type – Continuous THIN Freehand.
4. D type – Continuous THIN Zig-Zag.
5. E type – Dashes THICK.
6. F type – Dashes THIN.
7. G type – Chain Thin.
8. H type – Chain THIN and THICK.

How do you read mechanical designs?

1. General tolerances.
2. Projection details.
3. Scale used in the drawing.
4. Status of the drawing (Preliminary, Approved, etc.)
5. Name of the component or assembly.
6. Contact details of the drawing owner.
7. Mass.
8. Units used in the drawing.

Is engineering drawing hard?
It is a kind of technical drawing with complete specifications for engineered items. Engineering drawing may be about technical drawings but it is one of the toughest subjects, ask any engineering student and you will know. A sound knowledge of drawing is vital otherwise its a tough road ahead with the subject.

How do you read 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 is RF in engineering drawing?
A representative fraction (RF) is the ratio of distance on the map to distance on the ground.