Drafting Flashcards by Erica Keating

What should the surface of a drafting board be?
5 things

Smooth, have a true surface, no warps or twists and made of vinyl.

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What are drafting tables capable of?

Can be set at different heights and angles.

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What dimension are drafting tables?

Width: min 1.2 m (4ft)
Height: 0.9m (3ft)`

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What are the dimensions of a T-square?

0.75m (30”) - 1m (42”) long

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What is a T-square used for?

To draw horizontal lines

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What is the Fixed T - squared used for?

Most work

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What kind of lines does the T square draw?

Horizontal lines

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What is the French curve made of?
What does it help you draw?

Plastic or steel
Helps draw curves

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What is the modern term for a spline?

A flexible curve

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What is the spline (aka flexible curve) used for?

Also drawing curves

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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

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What are the softer grade drawing pencils used for?

sketching / rendering

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What are the harder grade drawing pencils used for?

Instrument drawings

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What is the point of scale rules?

The allow us to draw diagrams of piping systems / other objects at a reduced scale

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What measurement does the Architect’s scale rule use?

inches and fractions of inches

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When there is no template for a larger circle what can be used?

Compasses:
Bow
Wing
Friction compass

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What is the most common Architect’s scale ratio used?

1/4 “ = 1’ - 0”

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True or False: Architect’s ruler container two scales that run in opposite directions?

True

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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

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Now in metric…
what does
1:100 (Lb)
1:50 (sb)
1:20 (details)

1) larger buildings
2) smaller buildings
3) details

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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?

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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.