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Hello MarcoIng, the minimum slot width for CNC machining of aluminium can vary based on several factors. Typically, a cutting width of about 0.5 mm (or 500 microns) is considered feasible, but it is crucial to consider the specific capabilities of the CNC machine and the tools that will be used. Also, since the milling depth also impacts the tool choice, the radius of the internal corners in the milling must be R=working depth/4 (mills cannot cut straight angles) and not less than 1.5 mm (this rule is specified on our website). For works with a width less than 0.5 down to a minimum of 0.3, EDM technology is used

[MarcoIng]

Hello everyone, I am working on a project that requires the addition of some slits to aluminium parts using CNC machining. What is the thinnest slit width that I can design in my CAD file?

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[Giuseppe Pestrin]

Hello MarcoIng, the minimum slot width for CNC machining of aluminium can vary based on several factors. Typically, a cutting width of about 0.5 mm (or 500 microns) is considered feasible, but it is crucial to consider the specific capabilities of the CNC machine and the tools that will be used. Also, since the milling depth also impacts the tool choice, the radius of the internal corners in the milling must be R=working depth/4 (mills cannot cut straight angles) and not less than 1.5 mm (this rule is specified on our website). For works with a width less than 0.5 down to a minimum of 0.3, EDM technology is used

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[MarcoIng]

Thank you for your answer, Giuseppe. And the length of the slit? Does this also affect the producibility?

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[Giuseppe Pestrin]

Absolutely yes. The length of the slit in relation to its width (the aspect ratio) can actually affect the producibility. Longer slits with reduced widths can create issues during machining, such as tool deviation or breaking. It is essential to find a balance between the desired slit size and the practical limits of CNC machining.

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[MarcoIng]

Understood, thank you for the clarification. So, if I get a reasonable aspect ratio, I shouldn’t have any problems in production?

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[Giuseppe Pestrin]

Sure, but also consider another aspect: the surface finish of the slit. Smaller slits may require finer finishing tools and special techniques to achieve the desired surface quality. This can impact both production times and costs, so it’s essential to clearly communicate your needs to the supplier.

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[MarcoIng]

Thank you very much for the help!

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