Techical Drawings

Question 1

What is orthographic projection?

Answer 1

It’s the name given to technical dimensioned drawings. Third angle projection is the most common.

Question 2

What is sectional view?

Answer 2

They are produced to show the internal detail of an object. They cut away part of the object to show what is left. Hidden detail is never shown.

Question 3

What’s a herringbone cross hatching pattern?

Answer 3

When the lines join when hatching two materials. It should be clear where they change.

Question 4

What is a full sectional view?

Answer 4

This is when the cut is all the way through the object.

Question 5

What are items that don’t get sectioned?

Answer 5

Webs
Studs
Gear teeth
Axles
Pins
Ball bearings
Nuts
Bolts
Keys
Roller bearings
Screws

Question 6

What is a half sectional view?

Answer 6

A half section view cuts away a quarter of an object. They cut away half of a full section.

Question 7

What is a step sectional view?

Answer 7

They can also be called offset sections. They allow the cutting plane to change direction.

Question 8

What is a revolved sectional view?

Answer 8

Is showed the sectional view within the elevation of an object and are rotated around the centre line at 90^ to it. They are useful when saving space and showing the section of a long constant sectioned object.

Question 9

What is a removed sectional view?

Answer 9

They are similiar to revolved sections but the drawing is outside the original view. A cutting plane is used to show wheee the section is made. They are used to show small details and help with clear dimensioning. They are often drawn in enlarged scales.

Question 10

What is a part sectional view?

Answer 10

They are used when only a small part of the internal shape is required. You can define the outside of a part section with a break line or a combination of a break line and centra line.

Question 11

What are flat surfaces represented as in drawings?

Answer 11

A cross

Question 12

What is an isometric view?

Answer 12

It is a type of pictorial view which is drawn at 30^. They are often used to produce 3D views as they can show as realistic.

Question 13

What is an assembly drawing?

Answer 13

They are produced when various parts of a product are assembled. They are not normally dimensioned and there is no hidden detail.

Question 14

What is an exploded view?

Answer 14

Is it when components of a product are separated along an axis. Components must not overlap and are useful when showing how a product is manufactured.

Question 15

What is an auxiliary view?

Answer 15

This are views which look at an angle. The rules of projection are still followed but take place at a perpendicular angle. This can show particular parts of a drawing in more detail.

Question 16

What is an ellipse?

Answer 16

They are like squashed circles. They are dimensioned using the major axis and minor axis.

Question 17

What is internal tangency?

Answer 17

Internal tangency is when a circle or arc is inside another. You subtract the radis of the arcs or circles from each other.

Question 18

What is external tangency?

Answer 18

When the circles or arcs are outside each other. You add the radi together.

Question 19

What is the interpenetration of cylinders?

Answer 19

It is the name given to the line where two joined pipes meet.

Question 20

How to find the intersection of prisms?

Answer 20

There is a 45^ bounce line used to generate the lengths of the edges of the prisms where the intersection comes from.

Question 21

What is true length and true shape?

Answer 21

It shows the true view of a sloping surface.

Question 22

What is a surface development?

Answer 22

They are flat shapes which either fold or roll to make a 3D object. It is commonly used when manufacturing a sheet of metal.

Question 23

What is an oblique view?

Answer 23

It is the most simplistic pictorial view. It is drawn from the front as an elevation and projected back at 45^.

This is good as it clearly shows the front shape.

Question 24

What is a planometric view?

Answer 24

It is commonly used by interior designers. It clearly displays the internal details of a room. It is either drawn at 45^ and 45^ or 30^ and 60^.

Question 25

What is a perpspective view?

Answer 25

It is a realistic method of sketching where lengths appear to get smaller the further away they move from the viewer. The lines are all taken from a vanishing point. There are 1 and 2 point perspectives drawings.