67.2 MOST SIGNIFICANT FEATURE FIRST
Generally we can identify the most significant geometry. Some things to look for are,
- the features are all cut from a base piece - cutting
- there is a natural parting line - welding/molding/casting
- features seem to be stuck-on a base piece. - assembly/molding/casting
An example of this is an angled block with a hole,
Identifying significant features can be difficult, but some experience can help.
Large volumes of metal make parts hard to handle,
Thin walls can be difficult to manufacture and will collapse under force,
Small hole diameters can be difficult to produce,
Tolerances can be difficult to maintain.
Surface finish can be difficult to obtain, (micro-inches),
Difficult to produce features have preferred processes,
Materials tend to dictate suitable processes,
We can use a comparative graph of surface roughness to pick a process.
