Subtractive techniques
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Flip to reveal answersWhat is the difference between milling and turning?
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Question
What is the difference between milling and turning?
Answer
In turning the work rotates and the tool is fed along it, so it makes round shapes only. In milling the tool rotates and the work is moved past it, so it makes almost any reachable shape.
Question
What does abrading do that cutting cannot?
Answer
It removes very little material at a time with many small hard particles, holding tolerances and producing surfaces a cutting edge cannot — grinding, honing and polishing.
Question
Why are subtractive processes called wasting?
Answer
Everything removed is waste that was bought, transported and often processed first. A machined aerospace bracket can start as a block ten times its finished mass.
Question
What does subtractive manufacturing buy?
Answer
Accuracy and surface finish no other category reaches, in any material, with no tooling to make first — which is why prototypes, one-offs and mould tools are machined.
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Topic 4.1 hub
Manufacturing techniques
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