key drawing sectors Flashcards
(21 cards)
What is BS 8888?
A national standard for engineering drawings and geometrical tolerancing
BS 8888 covers all the requirements for the technical specification of products and their parts.
What does BS 8888 relate to?
Engineering drawings and geometrical tolerancing
It includes the use of engineering drawing symbols.
What is the purpose of a title block in engineering drawings?
To provide essential information about the drawing
This includes title, name, checked signature, version, date, notes, scale, and company name.
What information should be included in a title block?
- Title
- Name
- Checked signature
- Version
- Date
- Notes
- Scale
- Company name
What are the line types used in engineering drawings?
- Drawing line
- Hidden line
- Centre line and centre mark
- Phantom line
- Break line
- Dimension line and leader line
True or False: Hidden lines are used on isometric drawings.
False
Hidden lines and centre lines are only used on orthographic projection drawings.
What does the slope symbol indicate in engineering drawings?
The slope specification
It is placed at the left end of the slope specification.
How is straightness represented in engineering drawings?
By a straight line
This indicates a straightness requirement.
What symbol is used to indicate flatness?
An oblique view of a square surface
What is indicated by a circle in engineering drawings?
Circularity
What does a rectangle with two short dashes represent?
Datum feature symbol
What do the letters X and R signify in engineering drawings?
X indicates repetition and R indicates a radius dimension
Fill in the blank: The diameter of a circular component that has holes drilled into it is called the _______.
Pitch circle diameter (PCD)
What does PCD stand for?
Pitch circle diameter
What does the abbreviation ‘AF’ stand for in engineering drawings?
Across flats
What does ‘NTS’ mean on an engineering drawing?
Not to scale
What does ‘Rev’ stand for?
Revision
What are the main features of engineering drawings?
- Title block
- Line types
- Symbols
- Dimensions
What is the function of a datum line?
A standard position or level from which measurements are taken
What does the total runout symbol look like?
Two parallel arrows pointing upward connected by a horizontal line
What is the purpose of the leader in a datum feature triangle?
To extend from the triangle to the point of application
