7.5 Flashcards
What system do drawings follow
British standard BS8888
What series are drawings done in
A series
What angle is a pictorial/isometric horizontal line drawing line done at
30 degrees
When is the drawing number located and why
Bottom right and top left
Top left is upside down, for storage purposes
What do zones allow
Ease of identification as they will be lettered vertical and numbers horizontally coordinated
What is an amendment known as
Raising - in - issue
Why do we use break lines
As we have limited space on the page
Look at pics of how the holes look!!!!!!
How do we show surface texture
The little triangle with a line
What does a perspective drawing show and why do we not use them
How the human eye sees it
As they are inaccurate
What does first angle projection mean
Objective face is remote from its adjacent view (square on left)
What does third angle projection mean
Object is drawn to its adjacent view
What do exploded view drawings show
Used in the IPC as it shows every part that is in an assembly
What is good about schematic and wire diagram drawings
Can be used for trouble shooting
Why do we have a common datum
To prevent accumulative error
