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Dongguan Jinchen Precision Mold Co., Ltd. is a manufacturer specializing in high-precision mold parts processing and technology research and development. It has more than ten years of production experience and has solved many supply and technical problems for customers.

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Precision Engineering: Exploring the World of Custom Machined Parts

Custom machined parts are an essential component in the development of novel production items. Those parts may be unique in their design, or they can represent a necessary modification of an existing product.

The cost of machining parts depends on the complexity of their geometry. To minimize costs, engineers should specify tolerances on a feature-by-feature basis.

Precision Engineering

Precision engineering is a highly specialized type of mechanical engineering that involves working with products, machines and tools that require very tight tolerances in terms of size and shape. It is often used in areas such as medicine and aeronautics, where even a small discrepancy can lead to problems. Precision engineers work in a range of different environments and are often expected to be able to take ideas from others in order to create the best possible solutions.

As a result, they are often able to come up with innovative production methods that can save companies money and time in the long run. Precision engineers are also well known for designing components, machinery and equipment systems for a large range of uses and industries.

For precision machined parts to be created, the engineers in charge of the project need to design a specific part that will then be manufactured using precision tools and equipment. The goal is to ensure that the part created will fit into the precise specifications provided by the customer, with every single part being made in exactly the same way.

In addition to the precision of the parts being produced, it is essential that they are all inspected thoroughly by a team of skilled engineers in order to make sure that they are up to standards. In addition, if any problems are detected then the parts can be reworked or even rebuilt in order to fix the problem.

Precision parts are designed to run more efficiently than standard, un-machined parts, which means that they use less energy and can often be used for longer periods of time before needing replacement. This is a huge benefit to businesses as it means that they can cut down on maintenance costs while still getting the same high-quality results.

In addition, precision engineering can help companies reduce their environmental impact by reducing the amount of waste that is created during the manufacturing process. Precision parts are able to be reused many times over before needing replacing, which is a great way to reduce the amount of material that ends up in landfill sites and other areas where it can cause harm to the environment.

Metal Machining

The world of metal machined parts encompasses a broad range of techniques and technology. The basic premise is that metal parts are built using power machine tools to cut, shape, and mold metal materials into the desired design of a product or component. Often, these metal products are then treated after the machining process to alter the surface texture or appearance of the finished part. The most commonly machined metals include aluminum, steel, stainless steel (17-4 & Inconel 625 & 718), titanium, nickel, zinc, and brass.

The specific machinability of a particular material depends on its hardness, grain structure, and other properties. In general, softer metals can be milled with higher feeds and speeds than harder ones. Harder metals may also require a special heat treatment, known as annealing, to soften it enough for the machining process.

Machining can be either manual, in which a skilled machinist uses a manually operated machine tool to manually cut the material into the desired shape, or digital, where a motorized CNC (computer numerical control) machine cuts the material according to instructions programmed into it by the designer of the part. Digital machining is often preferable for complex shapes and for avoiding mistakes made by human hands, but machinists will still sometimes use manual machines for simple parts that can be created more quickly that way.

It’s important for anyone who designs and creates parts to follow machining guidelines. These guidelines include not having thin walls, holes with large radii, or other features that will be difficult for the machinist to cut. They should also ensure that the digital file follows DfM (Design for Manufacturing) guidelines, which will allow the machinist to easily program the computerized machine to do the cutting and molding.

The cost of a metal or plastic machined part can vary widely, depending on the method of machining used and the labor needed for effective execution. Some of the most common machining operations include drilling, milling, and turning. If a manufacturer requires any other auxiliary operations for a specific part, those will be added to the final cost of the part as well.

Plastic Machining

Plastic machining is an intricate and sometimes complex process. There are many types of machinable plastics to choose from, each with its own unique properties and benefits. Some are inexpensive, while others are high-strength and durable. The tensile strength and hardness of the plastic can impact how it forms chips, as well as its resistance to gouging or cracking. It’s important to understand how these characteristics will affect the machining process and final part quality.

Like metals, CNC plastic machining requires frequent machine calibration to ensure consistent accuracy. Clamping the workpiece is also important to prevent vibrations and movements during cutting, which could damage the plastic. Choosing the right tooling and adjusting cutting speeds to match the plastic’s abrasion resistance is critical for maintaining stability and precision. Similarly, some plastics are sensitive to heat and must be cooled down or lubricated with compatible coolants and lubricants to avoid melting or warping.

Another key difference between machining metals and plastics is thermal expansion rates. While this is not an issue when working with aluminum, it can be a major problem for plastics. UHMW, for example, expands about five times more than aluminum over the same temperature increase. Choosing plastics with low thermal expansion rates can significantly improve the dimensional stability of your machined parts.

Aside from these specialized considerations, most of the same machining techniques used for metals are applicable to plastic machining. However, it is important to note that abrasive plastics require different cutter geometries than harder materials and that drilling can be problematic for soft or brittle plastics. Additionally, plastics can be impacted by moisture and some chemicals and must be kept in air-conditioned environments or sealed in bags to protect them from degrading over time. Lastly, a rough surface finish may impact light transmittance and transparency, which is often an important factor in the appearance of finished plastic parts. However, this can be addressed with additional processes such as annealing and stress relief treatments. For these reasons, it’s important to seek out experienced plastic machinists when working with difficult or exotic plastics.

CNC Machining

CNC machining is the process of using pre-programmed computer software to control factory machinery and equipment to cut materials to make parts. It’s a very versatile method of creating custom machined parts and is highly useful for industries that require accurate tolerances.

The CNC machining process starts with a 2D vector or 3D Computer Aided Design (CAD) model of a part. These models must include all critical dimensions and geometries to be produced by the CNC machine. CAD files are exported to a 3D CAM software, which converts the design into a set of instructions that can be understood by the CNC machine. This instruction file is known as a G-code and is sent to the CNC machine to perform the cutting process.

During the cutting process, CNC machines leave visible tool marks on the surface of the finished product. To avoid these marks, CNC machinists apply one of several surface finishing options to the parts. Surface finishes protect the parts from corrosion, enhance their appearance and add durability to the finished product. Common surface finishing options for metal machining include anodizing, powder coatings, and bead blasting.

Once the final part is milled or turned, the CAD model can be inspected for accuracy and the dimensional tolerances are checked against the GD&T callouts specified in the CAD file. If required, a second set of GD&T callouts can be added to the CAD file.

JinChen offers instant quotes on CNC milled and lathed parts with fast turnaround on short run production, perfect for prototyping complex components and assemblies. We can produce a variety of custom machined parts made from a wide range of materials including metals and plastics. Our machinists can meet the strictest tolerances of your drawing specifications with the most precision and quality.

We know that the maker movement is creating some of the most innovative solutions and we want to give them access to high quality CNC machining services at a reasonable price. Until now, many CNC services have minimum quantity restrictions and prices that put them out of the reach of many makers. That’s why JinChen created the first CNC machined parts service dedicated to the maker community.

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If you are interested in any of Jinchen’s products or to discuss custom orders, please feel free to contact Jinchen. Jinchen looks forward to establishing successful business relationships and technology discussions with new customers around the world in the near future.

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