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Comparison of Additive Manufacturing 11/7/2019

Boeing and other manufacturers use three primary criteria to measure the value of additive manufacturing (AM) against CNC Machining: part performance, cost and lead time (see our blog post on this). In the past, metal AM processes were expensive and slow. As a result, their use in production was primarily in applications where the value of improved part geometries outweighed the sacrifice in speed and cost. For this reason, the analysis of production cost and schedule efficiency has been neglected.
With new high speed, low cost AM technologies like Joule Printing™, AM can now compete with (or augment) machining in speed and cost. This elevates the importance of a more thorough comparison of these two manufacturing methods – the purpose of this blog.quick UV led nail lamp
Machining is the most common choice for low volume manufacturing because it is flexible, and can produce strong, accurate parts. Machining removes material from a workpiece (typically a billet) by cutting it with rotating tools (milling) or rotating the workpiece itself against a tool (turning). These cutting processes are very accurate and have broad capabilities in part geometry and materials. In addition, machining has low tooling requirements – reducing fixed costs and lead time. Machining is usually the first choice for rapid, low volume manufacturing, and is used extensively for prototyping, tool production, and short-run production of end use parts.

While machining has advantages in low volume manufacturing, it is expensive and does not scale well for high volume production. Its shortcomings include: high material waste, expensive machinery, and a requirement for skilled programming time. In addition, for hard metals like titanium and tool steel, cutting times and tool wear are very high. Due to these limitations, manufacturers prefer more cost-effective processes like casting, stamping, and forging for high volume production.

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