CNC milling and turning are highly accurate and repeatable processes. Tight tolerances between +/-0.001″ – 0.005″ can be achieved, depending on specifications. Machines can be programmed to reliably run for 24 hours, 7 days a week if necessary, so CNC milling is a good way of getting parts produced on demand.
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Using standard tooling, a CNC machining service is particularly valuable for creating one-off parts, custom CNC parts, i.e., for replacing legacy components or delivering a specialized upgrade to a customer. It is also conceivable to scale single-part production to runs exceeding 10,000 units. Depending on the unit number, size, and complexity, the turnaround for CNC machined parts can be as short as one day. With shipping and delivery, deadlines can be met within a week.
Another primary advantage of CNC technology is its achievable mechanical properties. By cutting away from bulk material, rather than thermally transforming it as in injection-molding or additive manufacturing, all desirable mechanical properties of the metal or plastic of choice are retained. More than 50 industrial-grade metals, alloys, and plastics can be machined using CNC milling and turning. This selection includes aluminum, brass, bronze, titanium, stainless steel, PEEK, ABS, and zinc. The only material requirement for CNC machining is that the part has an adequate hardness to be fixtured and cut.
One trade-off when taking advantage of the high performance of CNC manufacturing services is that geometric complexity comes at a cost. Simple, chunky parts are the best designs for CNC milling and turning. There will always be some design limitations due to tool access, although the degree of this effect is relative to the number of axes on the machine. In other words, the more axes used, the more complex the features can be achieved.
Another trade-off is that start-up CNC machining costs can be expensive. It is necessary to have a trained professional perform the setup, tool loading, and programming on CNC mills and lathes. Luckily this cost is fixed, so by taking advantage of the same setup for multiple parts, it becomes more economical. Saving money is also achieved by keeping part repositioning to a minimum. Machining at 5-axis and above can sometimes be more economical on multi-faceted geometries because it eliminates the need to manually reposition the part.
The wire EDM method of machining can be slow and expensive relative to other processes, and the range of materials that can be used is shortened as they must be electrically conductive.
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If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.
Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.
CNC machining begins with a computer design of a part. Machines then precisely remove material to turn the design into a real machined part. This cutting can be done from different angles using machines that have 3, 4, or 5 moving parts, known as axes.
At RapidDirect, we have our own main CNC machine shop and a broad network of partner shops throughout China. Our facilities aren’t limited to just basic CNC machines. We also have grinders for smoothing surfaces, wire cutters for precise cuts, and EDM machines for detailed shapes. This variety allows us to tackle complex designs that produce unique CNC machined parts with specific requirements. Our skilled machinists work with exceptional accuracy, achieving tolerances as precise as 0.01mm. This level of detail is crucial for components that must fit perfectly into larger assemblies.
We also use automated production lines. These are setups where machines work together smoothly and quickly, which helps us produce large quantities faster and reduces the chance of errors. This efficiency means we can deliver quality machined parts quickly to meet our clients’ needs, keeping projects on schedule.
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