drawing conventions Flashcards
give 5 things that should be in a title block
author,scale,surface finish,projection,system of measurement
give 3 units from the imperial system
inches
feet
yards
give 3 units from the metric system
millimetres
kilometres
centimetres
give 2 benefits of the imperial system
visualisation-easier to visualise numbers in imperial than in metric
pre 1965-drawings which pre date 1965 will be in imperial
give 2 benefits of the metric system
world wide standard-used by 95% of the population
avoids error when communicating drawings or products
name the 5 different lines
visible construction centre hidden dimensions
what is tolerance
what we use to explain how much inaccuracy we are willing to accept on a finished product. it is written as a +/- value
what quadrant and views does a drawing in first angle projection have
first quadrant
top view is placed below front view and the right side is drawn to the left side of elevation
what quadrant and views does a drawing in third angle projection have
third quadrant
top view is placed above front view and right side is drawn to right side of elevation
name the two types of 3D drawing projections
isometric
2 point perspective
what is meant by british standards when referring to engineering drawings
a set of standards of things you should adhere to when producing an engineering drawing
what is the purpose of BS8888
provides a framework for all businesses to follow,so there is a standard way of working recognised
what are the benefits of adhering to british standards
efficiency and effectiveness- easy for original draughtsperson but other engineers would struggle to interpret it if there were no standards
fewer errors-ensures everyone can understand what is required
fewer supplier problems,more accurate parts and components
how do you convert inches to cm
multiply by 2.54
how do you convert cm to inches
divide by 2.54
