E112 L06
ASSEMBLIES
TOLERANCES
DIMENSIONS
dimension lines should not overlap
using parallel dimension ensures that it is easily read by the reader, seems neat as well
dont dimension hidden lines or features
dimension drawings must be neat
dimensions should not be repeated in other views
dimensions should be outside of the drawing
Parallel dimensioning, superimposed, running, chain, combined, small feature dimensioning,multiple features,radius,circle arc and hole dimensioning and angles
small feature dimensioning involves arrow heads outside extension lines
extension lines should not touch the drawing to avoid confusion
used and made for maufactures to read as machines are unable to achieve 100% accuracy in all models
ensure that connecting parts of two components are in a good fit
bilateral( two different directions with specified dimensions that need not be in the same amount) , unilateral ( varying only in one direction) and limit tolerance ( upper and lower dimensions are specified)
different manufacturing method has different acceptance of tolerance.
interference fit is where the minimum and maximum of corresponding creates a rigid fit
tolerance must be given to be realistic
clearance fit is where two connecting components are able to move in their places
every component have to connected to other components in the product
joints are used to connect components, different types of joints
begins with bringing and base component, due to central role.
multiple parts and components are bought together to make a more complex product
revolute joint allows components to rotate
rigid joints does not allow two components to move
slider joint allows to components to slide through/against each other
assemblies in a 3d drawing, have to be exploded into a 2d drawing
2d drawing has numbers on how to product should be fitted.
2d drawings have a bill table where parts, materials, numbers, quantity, and description of the product is elaborated