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What are the 7 drawing conventions used to assist in the reading and understanding of drawings?
- 1. Line styles
- 2. Dimensioning standards
- 3. Text
- 4. Page layout
- 5. Symbols
- 6. Abbreviations
- 7. Types of views
Why are different line conventions used on a drawing?
To give the drawing clarity
Why are borders included on a drawing and which type of line is used to draw them?
To show that everything is shown within the drawing and they are the heaviest continuous lines on a drawing
What is the name of the lines that are used to transfer the edges of a surface from one view to another?
What are object lines used to show and how do they look?
- Show the edges of an object that are not hidden
- They are heaving continuous lines that must stand out
Which type of line is used to show hidden and/or internal surfaces?
Lightweight dashed lines
Thin broken lines consisting of a long dash, space, short dash, space and long dash repeating are used to indicate what?
The centre lines of circles
What dimension style is used on an architectural drawing?
What must be done to read vertical dimensions when aligned dimensioning is used?
Rotate page clockwise 90 degrees
What are the 4 parts of a dimension?
- 1. Extension
- 2. Dimension
- 3. Endmarks
- 4. Measurement
Why is a space left between the object line and the extension line?
To show that it is not part of the drawing.
How are dimensions shown when there is insufficient room to show the dimensions in a confined space?
- The short dimension lines are placed outside of the extension line with end marks to indicate the extent of the dimension. The text is placed:
- Centred beside one of the dimension lines
- Above the space with a leader line or
- Between the extension lines (only when the text will not be crowded)
What are leader lines and where are they used?
- Used to point to an item that is described or identified by text.
- They are thin, dark lines that run at an angle with an end mark on one end pointing to the item.
How should text be positioned to make a drawing easier to read?
Always keep notes horizontal.
Is every dimension shown in each view?
No you only have to show once
Are hidden (invisible) lines dimensioned?
Where and how should dimensions be positioned?
Kept to the outside as much as possible with the smallest ones closest.
What is the recommended offset of dimensions from the object?
First line should be offset by 10-12 mm with each additional row offset by 6 mm.
What is the recommended margin from the borders to the edges of the paper?
- 10-15 mm on the top, bottom, and right edges
- left-hand margin 2 to 2 1/2 times the width of the right-hand margin to allow for binding pages together
List the 4 scales used when drawing a project shop drawing.
What is the name of the view that allows us to see the interior construction and assembly of an object?
List the 4 different types of sections.
What are the 2 types of cross-sections?
What is used to identify the location that an object is assumed to be cut open?
Cutting plane line
Describe a cutting plane line.
- Heavy phantom line style (long dashes separated by 2 short dashes repeating)
- With a direction arrow on one or both ends of the cutting plane line
What type of view are most sections?
Vertical cutaway views
Why are viewing direction arrows used?
To orient the section to prevent confusion
How is the material to be identified on a project shop drawing?
Material symbols that are shown on the end of the piece in section
What are details?
Large scale drawings showing the construction of small targeted areas (usually 1:1)