Drawing Standards, Protocols And Conventions Flashcards
What is the function of British standards?
They are guidelines/rules that a company must adhere to. They ensure a level of quality and consistency through products and services.
They are formal agreements on how something should be done and are widely accepted and followed by industry.
Drawings can contain a lot of detail and technical information so standards and conventions help create a common language and aids for other peoples understanding of a drawing. They also ensure accuracy or measurements and consistency in designs, and clear instructions for executing tasks.
Line types
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What the conventions of dimensioning?
Dimensioning is the process of add measurements and notes to a design. They are included on production drawings to show sizes and angles to provide clear instructions for those manufacturing the product of the drawing.
All sizes in mm
Dimensions must sit above the dimension line
Dimensions must be read from looking at the page or from the right
There must be a gap between the extension line and the item
Arrowheads must be long and thin, and must remain consistent.
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5 types of tolerancing?
Tolerances show the permissible limit of variation of a product sizes. They are the acceptable tolerances of a product.
Common tolerance - they show the upper limit of the size placed above the lower limit of the size.
Asymmetrical tolerance - they show the normal size plus the upper and lower size of the limits.
Symmetrical tolerance - they show the normal size and then plus minus the tolerance.
Functional tolerance - a dimension which is essential to the function of a component, F.
Non-functional tolerance - a dimension which is not essential to the function of a component, NF.
What is included in a title block?
Scale
Date
Product name
Page number
Designer name
Tolerance
Unit of measurement
Materials
Company brand
Drawing type
Third angle projection symbol
Rules of exploded views
The components must be exploded along the correct plane.
There must be space between different components of it is too difficult to understand.
The distance between exploded parts should be uniform.
All components are exploded in sequence.
All component parts are visible.
Rules for sectioning
Hatch lines are added to cut surfaces.
Hatch lines should go in different directions for different parts and should be offset as to not create chevrons.
Hatch lines should be at 45^ and evenly spaced. Angle and space can differ when allowing identification of different parts.
The thick ends of a cutting plane should not intersect with a drawing.
What are components that can’t be sectioned?
Webs
Axles/shafts/spindles
Screws
Bolts
Nuts
Pins
Holes
Voids
Washers
Drawing symbols
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When is a north point symbol applied to a drawing?
For reading location and site plans, you must know the direction and be able to interpret it from a north point.
What is a location plan?
It is the first drawing in a project set.
They are often at a scale of 1:1250.
They include the location of surrounding streets
The location of surrounding buildings.
Contours to show how steep the land is.
Geographical features such as rivers and woodlands.
What is a site plan?
It shows the site boundary and outline of a new building.
They are often at a scale of 1:250.
They include position of drainage, gas water and electrical supplies.
Trees
North point to show the direction that the building is facing.
What is a floor plan?
They are a type of sectional view which shows the inside plan of a building with the roof taken off.
They are often at a scale of 1:50.
They can include any of the building symbols.
What is a sectional house view?
They are cross sections showing a slice through a wall.
They give builders and joiners information on how the building should be constructed.
They include materials such as clockwork, brickwork, sawn timber and insulation boards.
They are often at a scale of 1:20
What are elevations of a house?
They are projections of a building produced by an architect or designer.
They show the style of building and the external appearance like roofs, doors, chimneys and windows.
