Task 3
Describe the relevant sources and
methods for obtaining any required
technical information relevant to the
model being produced (such as
drawing briefs, specification sheets,
request for changes or modifications
to models; technical information such
as limits and fits, contraction
allowances, bearing selection, surface
finish).
Drawing briefs
• Instructions stating which part(s) of an
assembly should be drawn as engineering
drawings.
• It will state the following:
– size of the drawings required
– 1st or 3rd angle orthographic projection
– how many copies required
– file format required
Specification sheets
• These sheets are documents such as:
– British Standards
– Company standards
– Customer requirements
• They may contain information such as:
– Manufacturing processes
– Materials to be used
Request for changes or modifications
to models
• These are documents that instigate a change
being made to a model or drawing.
• This document also acts as a change
notification to inform all personnel, from
estimating and sales through to
manufacturing, that a change has been made.
Technical information such as limits
and fits, contraction allowances,
bearing selection, surface finish
• This information is located in documents or books such
as:
– British Standards
– Zeus Books
– Engineers Handbooks
• It tells you nationally and internationally recognised
standards to work to, rather than creating your own.
• It saves time by giving you information in tables, rather
than you needing to calculate it yourself.
Questions?
• Technical information may be obtained from
sources such as:
– Drawing brief…. manufacturing
info/material/finish/dimensions
– Specification sheets.… manufacturer/designer
– Change or modification requests…. List changes
required to specification or an engineering drawing.
• Technical information including:
– Limits and fits…. Zeus books, internet, Mechanical
Engineers reference books
– Contraction allowances…. Mechanical Engineers
reference books, internet
– Bearing selection…. manufacturers or supplier
catalogues
– Surface finish…. samples, measured by machines