Tech drawings, properties, woods, metals, forces, etc. Flashcards
If the ratio is 1:3 is the drawing bigger or smaller than the actual object?
Bigger.
If the ratio is 2:1 is the drawing bigger or smaller than the actual object?
Smaller.
Do hardwoods have leaves or needles?
Leaves.
Do softwoods have leaves or needles?
Needles.
What is hardness?
The ability to resist scratching or denting.
What is rigidity?
The ability to resist deforming when a force is applied.
What is resilience?
The ability to resist impact.
What is malleability?
The ability to be shaped or flattened into a thin sheet.
What is brittleness?
Will shatter apon impact.
What is elasticity?
Ability to deform and return to the origional shape.
What is ductility?
Ability to be shaped into a wire.
What is electrical conductivity?
Ability to allow electrons to flow through.
What is thermal conductivity?
Ability to allow heat to flow through.
What is corrosion resistance?
Ability to resist rusting.
What makes a metal an alloy?
Adding iron.
What makes a metal/alloy ferrous?
Adding iron or steel.
What is the degree of the angle in an isometric projection?
30 degrees.
What is the degree of the angle in an oblique projection?
45 degrees.
An object line shows…..
… The visible details in an object.
A hidden line shows…..
….. The hidden details of an object.
The dimension line……
…. indicates a dimension
The extention line shows…..
Where a measurment begins and ends.
The diameter symbol…..
…. Indicates a diameter measurement.
The center and symmetry lines show….
….. The center of a circle or a hole.
How do you draw an object line?
It’s just a straight line. ex. _____
How do you draw a hidden line?
It’s a broken up line (dashes). ex. - - - -
How do you draw a dimension line?
Using arrows ← → (skinnier)
What 2 lines always appear together?
Dimension and extention lines.
How do you draw an extension line?
Two little parallel lines. ex. l l
How do you draw a diameter symbol?
Draw an ‘o’ with a diagonal line through it. ex. Ø
What is tension?
A pulling force. ex. tug of war, swing
What is compression?
A squeezing force.
What is tortion?
A twisting force. ex. wringing out a towel.
What is deflection?
A bending force. ex. a balance beam.
What is shearing?
A cutting force. ex. ripping a piece of paper.
What are the symbols for tension?
← →
What are the symbols for compression?
→ ←
What are the symbols for deflection?
↓
———
↑ ↑
What are the symbols for tortion?
🔁 (kinda)
What are the symbols for shearing?
→
← (except they’ll closer and are full arrows. you should know this.)
Are the arrows big or skinny when being drawn to show force?
Big.
What are examples of hardwood?
Alder, balsa, beech, hickory, mahogany, maple, oak, teak, and walnut.
What are examples of softwood?
Cedar, douglas fir, juniper, pine, redwood, spruce, and yew
What are examples of ferrous alloys?
Steel, stainless steel, Cast iron.
What are the main propterties of metals?
Electrical and thermal conductivity, Rigidity, rescilience, Ductility and malleability.
Pure metals are found where?
The earth’s crust.
