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MECH2300 - Engineering design > Engineering drawings > Flashcards

Engineering drawings Flashcards

1
Q

What is the purpose of an engineering drawing?

A

> Convey function
For manufacturing instructions
For inspections

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2
Q

Tolerances:

Define tolerances

A

The acceptable variability in the dimensions that allow the product to still work

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3
Q

Tolerances:

Define limits

A

Maximum and minimum dimensions

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4
Q

Tolerances:

What is a bilateral tolerance?

A

This is where there are equal limits above and below the nominal distance

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5
Q

Tolerances:

If there is no tolerance specified on the diagram, where will it be found?

A

In the title block

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6
Q

Tolerances:

How are tolerances shown on the drawing?

A

As the upper tolerance above the lower tolerance

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7
Q

Tolerances:

What is a unilateral tolerance?

A

This when there is no deviation from the nominal value

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8
Q

Tolerances:

What is tolerance accumulation/chaining?

A

This is when tolerances in series with each other sum together to produce an overall very large tolerance.

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9
Q

Tolerances:

What is datum baseline dimensioning?

A

This is where all dimensions are drawn relative to a reference plane/point

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10
Q

Tolerances:

What type of dimensioning scheme should be used for engineering drawings?

A

Datum baseline dimensioning

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11
Q

Tolerances:

What is direct dimensioning?

A

This is when a specific dimension is drawn on an engineering drawing

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12
Q

Tolerances:

When sampling tolerances, how do they statistically graph?

A

As normal distribution

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13
Q

Tolerances:

What is the equation for the standard deviation of chained dimensions?

A

σtotal = √(σ1^2 + σ2^2 + … + σ3^2)

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14
Q

Tolerances:

What is the standard method of calculating suitable ± values for a dimension?

A

±3σ

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15
Q

Engineering drawings:

What is a design scheme?

A

A drawing with notes, drawings and illustration that may only be understandable to the designer

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16
Q

Engineering drawings:

What is a design layout?

A

> A design showing the overall product and all its parts assembled
Drawn in orthographic projection

17
Q

Engineering drawings:

What is a detailed drawing?

A

> Drawn in orthographic projection
Unambiguous
Has a border and title block etc
Menu instruction

18
Q

Engineering drawings:

What is an assembly drawing?

A

> Orthographic drawing
Shows how components are fitted together
List of parts (called bill of components)

19
Q

Engineering drawings:

What is an assembly process drawing?

A

> Isometric sketch
Shows how it is assembled
No dimensions

20
Q

Engineering drawings:

What is an installation drawing?

A

> Shows measurements of the overall package

> Orthographic drawing

21
Q 
Projection systems:
For the grid:
x1   x2
y1   y2
What is found in each position for a first angle orthographic drawing?
A 
x1 = End
x2 = Front
y1 = NOTHING
y2 = Plan
22
Q 
Projection systems:
For the grid:
x1   x2
y1   y2
What is found in each position for a first angle orthographic drawing?
A 
x1 = Plan
x2 = NOTHING
y1 = Front
y2 = End
23
Q

Projection systems:

What is an isometric drawing?

A

> Drawing a 3D object on a 2D paper

> 2 Receding axes @30°

24
Q

Projection systems:

What is an Oblique drawing?

A

> Drawing a 3D object on a 2D paper

> 1 Receding axes @60° to horizontal

25
Q

Projection systems:

What is a perspective drawing?

A

This is where you have a horizon line and point and you draw to the horizon
LIKE GCSE DT

26
Q

Limits and fits:

What are the 3 types of fits for a shaft and hole? What are the features of each one?

A

Clearance fit - Shaft < Hole
Interference fit - Shaft > Hole
Traditional fit

27
Q

Limits and fits:

How can you assemble an interference fit?

A

Can be assembled by changing the temperature of the parts

28
Q

Limits and fits:

What is the format of an ISO fit code?

A

H7 / g6
H7 = Hole tolerance
g6 = Shaft tolerance
Use the table to work out the tolerance values (±)

MECH2300 - Engineering design (6 decks)

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