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CNC Milling

  • Description

    CNC milling is one of the most versatile manufacturing techniques. It precisely shapes parts offering excellent surface finishes and tight tolerances. Suitable for both simple and complex parts, it ensures consistent quality.
    It is widely used in industries like aerospace, automotive, and medical device manufacturing and modern techniques continue to drive innovation in precision manufacturing.

    Three-axis machining operates along the X, Y, and Z axes, making it ideal for simpler, more straightforward tasks. Multi-axis machining, which includes 4-axis and 5-axis machines, allows for rotation around additional axes, enabling the creation of more intricate and complex parts. This capability significantly reduces the need for multiple setups and enhances precision, making it essential for producing detailed components in advanced manufacturing sectors.

    We use both three-axis and multi-axis technologies in order to meet our customer’s requirements and price levels.

  • Standard Guidelines

    Maximum part size:

    • 40″x20″x25″ for 3 axis
    • 18″x18″x14″ for 5 axis

    Standard tolerances:

    • ±0.005″ (±0.127mm) for metals
    • ±0.008″ (±0.203mm) for plastics
    • ±0.002″ True position
    • ±0.002 flatness and parallelism

    Standard surface finish:

    • Ra 63 µin (1.6 µm) or better

    Edge breaks where unspecified:

    • 0.01″-0.03″ chamfers on external corners
    • 0″-0.03″ radius on the bottom corners of pockets
    • Sharp internal corners along the tool length will be interpreted as a 0.063″ radius

    If you have tighter requirements than these, please upload a drawing including your complete part definition.

  • Materials

    Materials that are available for instant quoting are:

    Aluminum – 6061, 7075
    Carbon Steel – 1018, 1045, 1215
    Alloy Steel – 4140, 4340, 8620
    Tool Steel – A2, D2, H13
    Stainless Steel – 303, 304, 316, 17-4
    Copper – 110
    Brass – 360
    Bronze – 934, 954
    Plastic – Delrin, Acrylic, Polycarbonate, PTFE, PEEK

    Other materials are available by request. Select “Other” in the drop down menu and include it in the order notes.

How do I keep the cost down?

We always have a lot of tools in stock, but we can’t keep everything. Our standard tools are inch, so refer to a drill chart and tool catalogue before specifying arbitrary hole sizes and radiuses. Our bull nose tools generally have a 0.03″ radius. Make sure to leave your corners slightly larger than the tool radius, and check the length to diameter ratio for tools that will be used in deep pockets.

A common mistake is making a part too close to a standard size thinking it will save material cost and machine time. If the part is 1.98″ we’re going to use 2-1/8″ stock! This is because most raw material’s stock finish has blemishes so we avoid leaving it unless specified in the print, and we need holding stock for the vise to grip. If you want to benefit from this line of thinking leave around 0.100″ in the direction it will be held in the vise.

Think about how your part is going to work. Areas that require precise alignment might need close tolerances, and reamed holes are fairly easy to achieve. Allow for more flexibility in other areas of the part. This approach requires less inspection and care during production, making it more cost-effective. Refer to this video if it isn’t clear.

Machining comes with a lot of setup and programming time. For low volume orders this gets lumped together and your per piece costs might leave you surprised. Our quoting tool will show you pricing at several quantities so you can select an option that meets your needs and plan for when your product needs to scale up. Large production orders benefit from additional optimization and bulk pricing through the entire supply chain, and we manually review those to remain competitive with other shops.

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