RO38 TA3: communicating design outcomes

Question 1

freehand sketching

Answer 1

drawing without the use of measuring instruments

Question 2

oblique drawing

Answer 2

3D pictorial drawing that focuses on the face of an object and uses an angle of 45 degrees to the horizontal

Question 3

cabinet oblique

Answer 3

a method of representing a 3D object on paper by extending the depth of the drawing using lines at 45 degrees. the receding axis (depth) is drawn at half the size to appear visually similar to the object

Question 4

cavelier oblique

Answer 4

a method of representing a 3D object on paper by extending the depth of the drawing using lines at 45 degrees. the receding axis (depth) is drawn at full size

Question 5

isometric drawing

Answer 5

3D pictorial drawing that focuses on the edge of an object and uses an angle of 30 degrees to the horizontal

Question 6

block diagrams

Answer 6

diagram of products or systems where separate parts are represented by blocks connected by lines showing their relationship to one another

Question 7

flowcharts

Answer 7

block diagram that shows how various processes are linked together to achieve a specific outcome

Question 8

circuit diagrams

Answer 8

graphical representation of an electrical circuit, showing how separate electrical components are connected

Question 9

wiring diagrams

Answer 9

simplified pictorial representation of a circuit that shows how the components should be connected together

Question 10

third angle orthographic projection

Answer 10

a drawing showing three different views of a part in 2D (front, plan and side) on the same diagram - in the symbol the smaller side points towards the circles

Question 11

standard conventions

Answer 11

agreed rules that set the standards used in engineering

Question 12

title block

Answer 12

area on a drawing which contains important information about the drawing or part

Question 13

scale

Answer 13

amount by which a drawing is enlarged or reduced from the actual size of an object, shown as a ratio

Question 14

tolerance

Answer 14

the variation allowed between a specific dimension in an engineering design and the measured dimension on the finished component

Question 15

linear measurements

Answer 15

show the dimensions of a part or product in mm. recorded with lines and arrows

Question 16

radius and diameter

Answer 16

radius: the distance from the centre of a circle to its edge
diameter: the distance across a circle referred to as DIA or ⌀

Question 17

surface finish

Answer 17

engineered surface finish is the smoothness or roughness of the face of a material.
the symbol is added on the surface that needs to be smooth. it looks like a tick shape with both sides 60 degrees to the material. the basic symbol is used if the material needs to be smoothed. if a machine is needed to remove the surface to make it smooth a horizontal line is added across the tick to make a triangle shape. A circle is added in the tick if no material removal is allowed but the surface needs a certain finish

Question 18

outlines

Answer 18

presented thicker than other lines on the drawing

Question 19

hidden detail

Answer 19

thick lines drawn as a dashed line
they show parts of your product that are hidden by the part of the product you are looking at.

Question 20

centre line

Answer 20

dot and dash sequence
show where the centre of the component is. referred to as CL

Question 21

projection

Answer 21

continuous thin lines
they are used to extend your drawing , they start 1 mm away from the drawing and extend up or across so the next view lines up

Question 22

dimension

Answer 22

numerical values used in engineering drawing to specify the size or positions of key features (usually in mm)
medium line with solid arrowheads on each end

Question 23

leader lines

Answer 23

connects a graphical representation on the drawing with some text

Question 24

across flats

Answer 24

where a dimension is taken across the flat edges of the object AF
dimensions can also be taken across the corners of an object

Question 25

square

Answer 25

the dimension SQ is often added when the drawing represents a square

Question 26

material

Answer 26

different materials are indicating by using different cross hatching and textures in notes materials are referred to as MAT or MATL

Question 27

holes

Answer 27

from the front a hole appears as a solid, circular outline drawn on the shape, from the side a hole is shown using hidden lines showing where each edge is and a centre line

Question 28

threads

Answer 28

for external threadsyou show the depth of the thread using two parallel lines on the side view, on the front view where you can see the diameter of the thread , you show this by drawing an incomplete circle for the narrowest diameter and a complete circle for the widest
for an internal thread the side view is drawn the same but with hidden lines and the front view the narrowest circle is complete and the outside circle is incomplete, inside the drawing

Question 29

countersinks

Answer 29

the countersink is made by adding the well around the top of the hole, you represent this by adding an angle at the top to show the angle from one edge to another in a curve as well as the dimension, there should be projection lines.

Question 30

knurls

Answer 30

knurling is putting ridges in a pattern on a material. it adds grip so the user can turn or lift apart more easily. you represent this as a pattern on a technical drawing to show it has texture. it is drawn with much thinner lines than the outlines

Question 31

cad

Answer 31

software that allows 2D drawings and 3D models to be produced on screen with different parts and modelled in different materials

Question 32

drawing

Answer 32

in notes a drawing can be referred to as DRG

Question 33

chamfers

Answer 33

is a sloping edge cut into the corner of two sides. they are used to remove sharp edges