Production Aids & Quality Control Flashcards
(35 cards)
What is a reference point?
A reference point, or datum, is a point from where all measurements are taken.
How are measurements often taken in drawings?
Measurements are often taken from a reference line or surface.
What increases accuracy in measurements?
Measuring from a reference point increases accuracy and reduces measurement error.
What are production aids?
Production aids are used to improve the speed and accuracy of production.
Where is the reference point usually located in coordinates?
The reference point is usually located where the axes meet (2D: 0,0 or 3D: 0,0,0).
How can you create a rectangle double the size of another?
Multiply each of the coordinates of its corners by two and plot the new coordinates.
What are templates?
Templates are shapes that can be drawn or cut around to produce a specific shape.
What is the purpose of jigs?
Jigs are used to guide tools, negating the need for marking up, thus saving time and improving accuracy.
What are patterns in textiles?
Patterns are used to trace outlines onto textiles so that they can be cut out and sewn together.
What are patterns in casting?
Patterns in casting are commonly made from metal, wood, and plastic resin.
What is the process of casting using a pattern?
A molten material is poured into the mould created by the reusable pattern to create an object that is the same shape as the pattern.
What is quality control?
Quality control is used to check the quality of a product against a set standard or specification.
What do customers expect when purchasing a product?
Customers expect their needs to be met, and the product must look right and perform its expected function.
How can product quality be ensured during manufacturing?
Measurable and quantitative systems should be used at every stage during the manufacturing process.
What is tolerance in quality control?
Tolerance is concerned with accuracy and can be defined as the variation allowed from a precise measurement.
What is an example of a tolerance measurement?
A product can be within a 0.5 mm limit above or below the specified measurement.
Example: 0.5 mm
What is another example of a tolerance measurement?
A product can be within a 0.25 g limit above or below the specified weight.
Example: 0.25 g
What does a 5% tolerance represent?
A 5% tolerance can be applied to resistance in electrical components, represented by a gold band on resistors.
Example: 5%
Why are tolerances included on working drawings?
Tolerances ensure manufacturers are aware of upper and lower limits, reducing the risk of improper fits, delays, waste, and costs for replacement.
What should be considered for quality control when designing a product?
It is important to consider what sort of checks can be used as part of quality control, often depending on the materials used.
How can the quality of color printing be checked?
The quality can be checked using registration marks, which consist of a circle with a cross through it.
What indicates correct alignment of printing plates using registration marks?
If the printing plates are aligned correctly, the registration mark will be clear and defined.
What indicates misalignment of printing plates using registration marks?
If the printing plates are misaligned, the registration mark will be fuzzy and color will be visible.
What are Go/No Go gauges used for?
Go/No Go gauges are used to check that component dimensions are within specified tolerances. They are often double-ended with each side manufactured to the upper and lower tolerances.
