11. Accuracy In Design And Manufacture Flashcards
(14 cards)
What is meant by measurement?
The process of using tool such as rulers tapes and gorgeous to check existing dimensions
What is meant by marking out?
The transfer of designs onto materials or parts being manufactured to indicate the position of features such as holes and edges
What is meant by accuracy?
The level of conformity of a measurement to the required value
What is meant by tolerance?
The acceptable range of accuracy is known as the tolerance
Why is the accuracy important in design?
Accuracy is important as accurately fitting parts ensure the correct function of products
Methods of improving accuracy
The use of data edges and surfaces as well as vertical horizontal lines generated by laser levels provide reference points to facilitate improved accuracy
How can testing eliminate errors?
- dials on manual machine controls allow precision movement of tools and workpieces
- Digital test are very accurate often computer linked measuring devices
- profile projectors measure find details such as threads to accuracy of 0.015 mm
- CNC machines use computer codes to control their movement and accuracy
- Laser micro material, thickness sensors and alignment systems are examples of noncontact devices
What are jigs?
Devices that guide tools such as drills accurately for repetitive machining operations without the need for marking out
How does the use of jigs intro accuracy and used in mass production ?
It is made possible for fast high-quality machining operations to be carried out by semi skilled workers as there is a reduced risk of human error
What is meant by fixtures?
Fixtures maintain the accurate alignment of parts for processes such as welding by providing a framework into which their securely clamped in place
How does templates ensure accuracy?
The rich shape of templates and shows consistent repetition of the same outline by providing as a consistent profile for marking out the shape of identical pieces
What types of processes are template used for?
Batch production
What is the geometric dimensioning and tolerancing?
A standard system of engineering drawing symbols and figures used for specifying the product component dimensions and tolerances
