Undercut clearance Recommended width 3 mm 18 to 40 mm 1 ½ Max Depth 2x width

Undercut clearance recommended width 3 mm 18 to 40 mm

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Undercut clearance Recommended width: 3 mm (1/8’’) to 40 mm (1 ½’’) Max. Depth: 2x width Design undercuts with a width of whole millimeter increments or a standard inch fraction. For undercuts with non-standard dimensions, a custom cutting tool must be created. The standard tools have a cutting depth of approximately two times their width. This limits the achievable depth. Undercut dimensions
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25 Part 3 Materials for CNC machining CNC machining can be used with a very wide range of engineering metals & plastics. In this section, you will learn more about the key characteristics of the most popular materials. We will also examine the most common finishes that are applied to CNC machined parts.
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26 Selecting the right material is a crucial step in the design process. The optimal material option is highly dependent on your specific use case and requirements. Since almost every material with sufficient hardness can be machined, CNC offers a very large range of material options to choose from. For engineering applications, metals and plastics are most relevant and will be the focus of this section. Surface finishes can also alter the properties of CNC machined parts and we will examine them below. To get started, take a look at this decision tree. It contains high-level material recommendations that cover the most common de- sign requirements. Materials for CNC machining
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27 CNC machining is primarily used with metals and metal alloys. Metal can be used for both the manufacturing of custom one-off parts and prototypes and for low-to-medium batch production. Aluminum 6061 is by far the most used material in CNC machining. Metals Learn more about the most common CNC metals Aluminum alloys have an excellent strength- to-weight ratio, a hight termal and electrical conductivity and natural protection against corrosion. Aluminum Excellent machinability and frictional char- acteristics. Aesthetically pleasing golden appearance Brass > C360 Exceptionally high hardness, stiffness, abra- sion and thermal resistance. They are used for dies, stamps, molds and other industrial tooling. Tool steel > D2 > O1 > A2 General use steel alloys with improved hard- ness, toughness, fatigue and wear resistance over mild steels, but low chemical resistance. Alloy steel > 4140 > 4340 Low-cost, general use alloys with good mechanical properties, machinability and weldability. Mild steel > 1018 > 1045 > A36 Stainless steel alloys have high strenght, high ductility, excellent wear and corrosion resis- tance. They can be welded, machined and polished. Stainless steel > 304 > 316 > 2205 > 17-4 > 6061 > 7075 > 5083
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28 Plastics are lightweight materials with a wide range of physical properties. They are often used for their chemical resistance and electrical insulation properties. Plastics are commonly CNC machined for prototyping purposes prior to Injection Molding.
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