Accuracy in Design and Manufacture

Question 1

Define accuracy

Answer 1

level of conformity of a measurement to the required value

Uses measurement and marking out

Question 2

What is the acceptable range of accuracy known as?

Answer 2

Tolerance

Question 3

Give one way of improving accuracy?

Answer 3

datum edges and surfaces (vertical and horizontal lines generated by laser levels)

Question 4

Give 4 ways of testing to eliminate errors

Answer 4

Dials on manual machine controls
Digital test gauges (measure devices)
CNC machines use computer codes to control movement
Non-contact devices : laser micrometers, materials thickness sensors

Question 5

What are jigs used for?

Answer 5

Guiding tools accurately for repetitive machining properties without the need for marking out

Question 6

Give 3 benefits of using jigs

Answer 6

fast, high quality, can use semi-skilled workers as reduced risk of human error

Question 7

What is the name of a specialised framework fitted with clamps to hold pieces of material in the correct position for processes such as welding?

Answer 7

templates

Question 8

True or false: measuring aids are most commonly used in mass production

Answer 8

False - mostly batch

Question 9

What is meant by the standardisation of geometric dimensioning and tolerancing?

Answer 9

standard system of engineering drawing symbols and figures to specify a products components dimensions and tolerances