Drafting Flashcards
What should the surface of a drafting board be?
5 things
Smooth, have a true surface, no warps or twists and made of vinyl.
What are drafting tables capable of?
Can be set at different heights and angles.
What dimension are drafting tables?
Width: min 1.2 m (4ft)
Height: 0.9m (3ft)`
What are the dimensions of a T-square?
0.75m (30”) - 1m (42”) long
What is a T-square used for?
To draw horizontal lines
What is the Fixed T - squared used for?
Most work
What kind of lines does the T square draw?
Horizontal lines
What is the French curve made of?
What does it help you draw?
Plastic or steel
Helps draw curves
What is the modern term for a spline?
A flexible curve
What is the spline (aka flexible curve) used for?
Also drawing curves
Drawing pencils:
true or false: this scale goes from softest to hardest, 6B, 2B, B, H, 4H, 9H
True
6B = very soft / black
9H = hardest
What are the softer grade drawing pencils used for?
sketching / rendering
What are the harder grade drawing pencils used for?
Instrument drawings
What is the point of scale rules?
The allow us to draw diagrams of piping systems / other objects at a reduced scale
What measurement does the Architect’s scale rule use?
inches and fractions of inches
When there is no template for a larger circle what can be used?
Compasses:
Bow
Wing
Friction compass
What is the most common Architect’s scale ratio used?
1/4 “ = 1’ - 0”
True or False: Architect’s ruler container two scales that run in opposite directions?
True
What are:
1/8” scales (b)
1/4” scales (s - b/h)
1/2” scales (d) used for?
1) Larger buildings
2) smaller buildings and houses
3) scale for details
Now in metric…
what does
1:100 (Lb)
1:50 (sb)
1:20 (details)
1) larger buildings
2) smaller buildings
3) details
True or false: Photocopies / reproductions of drawings are always to scale or the original?
False: they may not be to the scale of the original
What does the movable metal hook at the end of the tape measure provide?
Accurate measuring when butted up against or hooked on the end of something.
What happens when you divide the length on a drawing by the scale fraction or number?
You’d be calculating the length in feet…
1/4” = dividing by 4
1/8” = dividing by 8
1/2” = dividing by 2
What must symbols be?
simple and easy to draw
What is the symbol / abbreviation for Cold water?
___-____-____
CW
What is the symbol / abbreviation for Hot water (140F)
____- - ____- - ____- - ____
HW
What is the symbol / abbreviation for Hot water return (recirc) (140F)
____- - - ____- - - ____ - - - ____
HWR
Butt weld has:
A) filled in circles
B) empty circles
A) filled in circles
What symbol does a Soldered 90 have?
empty circles with line drawn through
What does Safety Relief Valve look like
What does an angle pattern globe valve look like?
What does an Object line / Margin Line look like?
______________
Heavy solid line
Shows visible shape, edges / outlines
What does a Hidden Body Line look like?
Short dashes
Shows hidden object lines not visible to the eye
What is a Leader Line?
Points to notes or specification
What is a Cutting Plane Line?
Shows a section view / an imaginary cross-section
True or False: Letters and Numbers must be black
True: It makes them easier to read / stand out
What is the angle used in Isometric views?
30 degrees
How many views does an Orthographic view have?
multiple BUT each projection view shows only ONE face of an object.
Ex: front, side, top or box. Think of an unfolded box
Which views are necessary in an Orthographic view?
Front, Top, and Right-Side views
If an object is more complex more views are needed.
What does a 90 angle look like?
Plan view
Front elevation Right elevation
What does a Tee look like facing away from you?
think star wars
What 3 dimensions do Isometric drawings use?
length, width and height
True or False: Piping runs that are not parallel to the isometric axes will not be to scale
True. it needs to show length, height and width
What is the main purpose of building codes?
to protect public health, safety and general welfare because building codes relate to the construction / occupancy of buildings and structures
What happens when standards are referenced in codes / regulations?
They become laws
What does the Canadian Standards Association symbol look like?
When is a plumbing permit required?
Install, change or upgrade any part of a plumbing system
Do repair or replacement work, if you have to:
Open walls
move pipes
Changes other plumbing or pips
LEED is a program that provides what?
third-party verification of green buildings
What does LEED stand for?
Leadership in Energy and Environmental Design
What does NPC stand for?
National Plumbing Code
BC plumbing (BCPC) applies the core concepts of what?
National Plumbing Code
Once equipment is installed, what happens?
Instructions should be left with the customer for future reference.
