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# Design Recommendations

CNC Machining Guide

CNC machining is a vital component of the manufacturing industry. Jingbang's team of highly skilled machinists and programmers utilizes CAD drawings to produce precise and accurate prototypes and components. This section of the CNC Machining Guide will explore strategies for reducing costs and enhancing project outcomes through improved design and process comprehension.

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CNC Machining Materials

In the Materials Guide, you can learn about common materials, including metals, plastics, and rare metals.

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CNC Machining Finishes

Explore our range of finishes and discover the benefits each offers. Choose the perfect finish for your project.

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Quality Assurance

We adhere to strict testing procedures and will provide you with the required certifications, as well as accept third party testing.

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Jingbang's CNC Machining

Evaluation Before CNC Machining

CNC machining can shape and cut materials into the desired forms using various tools. While it is precise, there are some things to consider when designing parts. Think about how easy it is to access and how complex it is before machining for the best results.

CNC machining cutting tools are highly accurate for shaping and carving various materials. They come in a variety of sizes and shapes to suit different applications. When designing your part, it is important to consider the dimensions of the tool. Because these tools are cylindrical, there will always be a radius at the inside corners, regardless of the size of the cylinder.

cnc internal corner

Certain surfaces may be inaccessible to the cutting tool, limiting the depth of an undercut and making it impossible to create hidden internal geometries. Areas unreachable by the cutting tool cannot be machined, which may restrict part design. Consider these limitations when designing for CNC machining to ensure high-quality results.

cnc hidden internal geometries

Complex geometries may be achievable, but will increase the time and cost of your project due to the number of tool changes and machine setups required.

Complex CNC Parts

CNC Machining Design Guide

CNC Guide Cavities and Pockets

Cavities and Pockets

When designing pockets and cavities for CNC machining, consider the cavity depth, as it affects tool size, radii, and fillets. Deeper cavities require larger tools and adjusted design elements for optimal results. Depth is less than 10ø of the tool diameter for better accuracy and efficiency.
CNC Guide Holes

Holes

When designing parts with holes, consider the following factors: hole size, shape, and orientation can affect structural integrity and functionality. Material properties and manufacturing processes influence accuracy and quality. Environmental conditions and potential stresses should also be evaluated. Proper consideration ensures a well-designed part that meets specifications and performs optimally. Recommendation: Use standard drill bit sizes (ø) and ensure d > 4ø. For feasibility, allow d ≤ 10ø. For blind holes, account for drill point depth by measuring depth-to-diameter while considering the extended point length.
CNC Guide Minimum Features

Minimum Features

When designing minimum features for CNC machining, consider factors like part size and complexity, material type, part purpose, CNC machine capabilities, required tooling, and machining process. This ensures accurate and efficient machining of the part's minimum features.
CNC Guide Engraving

Engraving

When engraving CNC machined parts, consider the material, size, font, depth, location, and tool. Use appropriate techniques for each material. Ensure text is clear and properly sized. Engrave deep enough to be visible without compromising the part's structure. Choose a suitable location. Recommended: .125 in high characters minimum.
CNC Guide Internal Edges

Internal Edges

When designing parts for CNC machining with internal edges, it is crucial to consider the radii of those edges. The radii refer to the curvature of the edges, and they play a significant role in determining the cutting tool size that should be used for the machining. If the radii are too small, a smaller cutting tool will be needed, and conversely, if the radii are too large, a significant cutting tool will be required. Standard drill bit sizes are commonly used in CNC machining, making finding the right cutting tool easier.

Threads

When designing parts for CNC machining that require threaded features, it is essential to consider the thread type, size, and pitch. The thread type refers to the shape of the thread, whether it is a V-thread, square thread, or acme thread. The size of the thread refers to the diameter of the major and minor threads, while the pitch is the distance between consecutive threads. These factors are critical to ensure that the threads are compatible with the mating parts and that the part functions properly.
CNC Guide Thin Walls

Thin Walls

When designing parts for CNC machining, it is crucial to pay close attention to the thickness of walls. This is because walls that are too thin can easily break or warp during the machining process, ultimately leading to a subpar final product. Additionally, overly thick walls can make the part heavier and more expensive to produce. Therefore, it’s essential to balance thickness and durability while also considering the specific needs and requirements of the designed part. By considering these factors, designers can create functional, durable, and cost-effective parts.
CNC Guide Undercuts

Undercuts

Designers should consider specific guidelines when creating parts for CNC machining with undercuts. Undercuts require extra machining steps and can increase complexity and cost. To reduce impact, minimize depth and complexity, avoid sharp corners or abrupt transitions, and ensure clearance between feature and tool. Following these guidelines will optimize part designs for CNC machining and ensure high-quality production.

CNC Machining Insights

Learn more about surface treatment in Jingbang’s Resource Hub

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Hardness (Brinell)Density (g/cm^3)Tensile Strength(MPa)Fatigue Strength (MPa)
Aluminum 6061602.68193117
Aluminum 6063732.721468.9
Aluminum 70501472.83490160
Aluminum 7075(Aerospace Grade)1502.81503159
Aluminum MIC-6652.7105N/A
Aluminum 5052602.68193117
Hardness (Brinell)Density (g/cm^3)Tensile Strength(MPa)Fatigue Strength (MPa)
Copper 10165 - 908.89 - 8.9469 - 36576 - 90
Copper C11065 - 908.8969 - 36576 - 90
Copper C17280 - 858.25515 - 585275
Copper C26060 - 828.53103 - 44190
Copper C36063-1308.49124-310138
Brass CZ12190 - 1608.47360 - 500220 - 360
Brass CZ13170 - 1408.5340 - 480200 - 350
Hardness (Brinell)Density (g/cm^3)Tensile Strength(MPa)Modulus of Elasticity (GPa)Elongation at Break(%)
Stainless Steel 17-73887.812752046
Stainless Steel 3012178.0320521240
Stainless Steel 3031608.0324020050
Stainless Steel 3161878.0320519340
Stainless Steel 3322008.0329419644
Stainless Steel 4163607.89622009.5
Stainless Steel 4205067.8104020011.5
Stainless Steel 440C495 - 6537.8450 - 1900204 - 2152.0 - 14
Hardness(Shore D)Density (g/cm^3)Modulus of Elasticity (GPa)Tensile Strength(MPa)Elongation at Break(%)
HDPE50 - 760.92 - 0.990.565 - 1.511 - 433 - 80
UHMW-PE54 - 1200.8 - 1.80.3 - 1.111.6 - 403.5 - 800
PVC801.16 - 1.651.82 - 7.033.45 - 73.12 - 330
ABS/Nylon Blend641.04 - 1.210.9 - 5.327 - 1003.1 - 230
Acrylic600.7 - 1.30.95 - 3.7925 - 851 - 85
Nylon 6676 - 881.02 - 2.70.6 - 2510 - 981 - 300
PTFE11 - 700.7 - 3.350.392 - 0.750.86 - 41.470 - 650
PEEK62 - 941.26 - 1.722.14 - 2411 - 1251.7 - 100
POM-H811.423.27530
POM-C791.412.86740
Hardness (Brinell)Density (g/cm^3)Tensile Strength(MPa)Modulus of Elasticity (GPa)Elongation at Break(%)
Titanium(Grade 1)1204.5170 - 31010324
Titanium(Grade 2)2004.51276 - 44810320
Titanium(Grade 4)2654.51480 - 65510515
Ti-6Al-4V(Grade 5)3794.43110011410
Bronze11.6 - 4205.6 - 1469 - 80072.4 - 1380 - 70
Zinc Alloy (Zamak 5)916.720870 - 1007
Steel Alloy AISI 43403887.8597220012.1
Nickel Alloy175 - 2408.44414 - 75820716