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Both terms reflect the simple fact that the technologies all share the common theme of sequential-layer material addition / joining throughout a 3D work envelope under automated control.
Further advantage was taken of the nature of FDM polymer printing to make it possible for printers with small work envelopes to produce large items, i . e ., the Charon was designed to be printed in sections and then assembled with solvent cement.
The many more recently developed processes labeled " machining ", such as electrical discharge machining, electrochemical machining, electron beam machining, photochemical machining, and ultrasonic machining, or even plasma cutting and subtractive and additive manufacturing in one work envelope, and retrofits of existing machines are underway.
The integration of milling into turning environments and of turning into milling environments, begun with live tooling for lathes and the occasional use of mills for turning operations, led to a new class of machine tools, multitasking machines ( MTMs ), which are purpose-built to provide for a default machining strategy of using any combination of milling and turning within the same work envelope.
Two reasons are that ( 1 ) for the maker it is more practical ( and thus less expensive ) to make the individual pieces as separate endeavors than to machine all their features in relation to each other while the whole unit is integrated ( which would require a larger machine tool work envelope ); and ( 2 ) the user can change some pieces while keeping other pieces the same ( rather than changing the whole unit ).

work envelope การใช้

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