Cnc Mill Retrofit

Types of cnc mill retrofit

CNC mill retrofitting is the process of upgrading an existing milling machine with modern computer numerical control (CNC) technology. There are several types of CNC mill retrofit, each with its own advantages and disadvantages.

1. Retrofitting with a CNC control system: This type of retrofit involves replacing the existing manual control system with a modern CNC control system. The new system includes a computer, software, and servo motors that control the movement of the machine. This type of retrofit is relatively simple and cost-effective, but it may not be suitable for machines with worn-out mechanical components.

2. Retrofitting with a CNC kit: This type of retrofit involves installing a pre-made CNC kit onto the existing machine. The kit includes all the necessary components, such as motors, drives, and controllers, and can be easily installed by a technician. This type of retrofit is more expensive than retrofitting with a control system, but it provides better accuracy and precision.

3. Retrofitting with a custom-built CNC system: This type of retrofit involves designing and building a custom CNC system that is tailored to the specific needs of the machine. This type of retrofit is the most expensive and time-consuming, but it provides the highest level of accuracy and precision.

4. Hybrid retrofitting: This type of retrofit involves combining manual and CNC control systems on the same machine. The machine can be operated manually or with CNC control, depending on the task at hand. This type of retrofit is suitable for machines that are used for both production and prototyping.

In conclusion, CNC mill retrofitting is a cost-effective way to upgrade an existing milling machine with modern technology. The type of retrofit chosen depends on the specific needs of the machine and the budget of the owner.

Pros and Cons of Using cnc mill retrofit

CNC mill retrofitting is the process of upgrading an existing milling machine with modern computer numerical control (CNC) technology. This can be a cost-effective way to improve the performance and capabilities of an older machine, but there are also some potential drawbacks to consider. Here are some pros and cons of using CNC mill retrofitting:

Pros:

1. Cost-effective: Retrofitting an existing machine can be much less expensive than purchasing a brand new CNC mill.

2. Improved accuracy: CNC technology can provide much greater precision and accuracy than manual milling machines, which can lead to better quality parts and products.

3. Increased productivity: CNC machines can operate much faster than manual machines, which can increase productivity and output.

4. Greater flexibility: CNC machines can be programmed to perform a wide range of tasks, which can make them more versatile and useful for a variety of applications.

5. Reduced labor costs: CNC machines require less manual labor than traditional milling machines, which can save on labor costs over time.

Cons:

1. Compatibility issues: Not all older milling machines are compatible with modern CNC technology, which can limit the options for retrofitting.

2. Technical expertise required: Retrofitting a machine with CNC technology requires specialized knowledge and expertise, which can be a challenge for some businesses.

3. Downtime: Retrofitting a machine can take time and may require the machine to be out of commission for a period of time, which can impact production schedules.

4. Maintenance costs: CNC machines require regular maintenance and repairs, which can add to the overall cost of retrofitting.

5. Learning curve: Operators may need to be trained on how to use the new CNC technology, which can take time and resources.

In conclusion, CNC mill retrofitting can be a cost-effective way to improve the performance and capabilities of an older milling machine. However, there are some potential drawbacks to consider, including compatibility issues, technical expertise required, downtime, maintenance costs, and a learning curve for operators. Businesses should carefully weigh the pros and cons before deciding whether to retrofit an existing machine or purchase a new CNC mill.

cnc mill retrofit Reference Specifications (varies for different product)

A CNC mill retrofit is a process of upgrading an existing milling machine with modern computer numerical control (CNC) technology. The retrofitting process involves replacing the old control system with a new one that is capable of controlling the machine’s movements with greater precision and accuracy. The following are some reference specifications for a typical CNC mill retrofit:

1. Control System: The control system is the heart of the CNC mill retrofit. It should be a modern, user-friendly system that is capable of controlling the machine’s movements with high precision and accuracy. The control system should have a graphical user interface (GUI) that allows the operator to easily program and control the machine.

2. Motors and Drives: The motors and drives are responsible for moving the machine’s axes. The motors should be high-quality, high-torque motors that are capable of precise movements. The drives should be modern, digital drives that provide smooth and accurate motion control.

3. Spindle: The spindle is the part of the machine that holds the cutting tool. The spindle should be a high-quality, precision spindle that is capable of high-speed and high-precision machining.

4. Encoders: Encoders are used to measure the position of the machine’s axes. The encoders should be high-resolution encoders that provide accurate position feedback to the control system.

5. Software: The software used for the CNC mill retrofit should be modern, user-friendly software that is capable of generating complex tool paths and controlling the machine’s movements with high precision.

6. Safety Features: The CNC mill retrofit should include safety features such as emergency stop buttons, safety interlocks, and protective covers to ensure the safety of the operator and the machine.

In summary, a CNC mill retrofit involves upgrading an existing milling machine with modern CNC technology. The retrofit should include a modern control system, high-quality motors and drives, a precision spindle, high-resolution encoders, user-friendly software, and safety features.

Applications of cnc mill retrofit and Type of Companies use cnc mill retrofit

CNC mill retrofit refers to the process of upgrading an existing milling machine with modern computer numerical control (CNC) technology. This technology allows for greater precision, accuracy, and efficiency in the milling process. There are several applications of CNC mill retrofit, including:

1. Upgrading older milling machines: Many companies have older milling machines that are still in good condition but lack modern CNC technology. Retrofitting these machines can extend their lifespan and improve their performance.

2. Customization: CNC mill retrofit allows for greater customization of milling machines to meet specific production needs. This can include adding new features or modifying existing ones.

3. Cost savings: Retrofitting an existing milling machine can be more cost-effective than purchasing a new one. It also reduces the amount of waste generated by disposing of an old machine.

4. Improved productivity: CNC technology allows for faster and more efficient milling, which can increase productivity and reduce production time.

The type of companies that use CNC mill retrofit varies widely. Some examples include:

1. Manufacturing companies: CNC mill retrofit is commonly used in manufacturing companies that produce parts or components for various industries, such as aerospace, automotive, and medical.

2. Job shops: Job shops that provide milling services to a variety of customers can benefit from CNC mill retrofit, as it allows them to offer more precise and efficient milling services.

3. Research and development: Companies that conduct research and development may use CNC mill retrofit to upgrade their milling machines and improve their ability to prototype and test new products.

4. Educational institutions: CNC mill retrofit can be used in educational institutions to teach students about modern manufacturing technology and prepare them for careers in the industry.

In conclusion, CNC mill retrofit has numerous applications and can be used by a variety of companies. It offers many benefits, including improved precision, efficiency, and cost savings.

Quality Testing Methods for cnc mill retrofit and Work Process Use cnc mill retrofit

CNC mill retrofitting is a process of upgrading an old or outdated milling machine with modern CNC technology. This process involves replacing the old control system with a new one that is more efficient and accurate. Quality testing methods are essential to ensure that the retrofitting process is successful and that the machine is functioning correctly. Here are some quality testing methods for CNC mill retrofit:

1. Calibration: Calibration is a process of adjusting the machine to ensure that it is accurate and precise. This process involves checking the machine’s accuracy by measuring the distance between the tool and the workpiece. Calibration should be done regularly to ensure that the machine is functioning correctly.

2. Runout Testing: Runout testing is a process of checking the machine’s spindle to ensure that it is running smoothly and accurately. This process involves measuring the spindle’s runout by using a dial indicator. Runout testing should be done regularly to ensure that the machine is functioning correctly.

3. Surface Finish Testing: Surface finish testing is a process of checking the quality of the surface finish produced by the machine. This process involves measuring the surface roughness of the workpiece using a surface roughness tester. Surface finish testing should be done regularly to ensure that the machine is producing high-quality workpieces.

4. Cutting Force Testing: Cutting force testing is a process of measuring the force required to cut the workpiece. This process involves using a dynamometer to measure the cutting force. Cutting force testing should be done regularly to ensure that the machine is functioning correctly.

5. Work Process Use: Work process use is a process of testing the machine’s performance in real-world conditions. This process involves running the machine through a series of tests to ensure that it is functioning correctly. Work process use should be done regularly to ensure that the machine is producing high-quality workpieces.

In conclusion, quality testing methods are essential for CNC mill retrofitting to ensure that the machine is functioning correctly and producing high-quality workpieces. Calibration, runout testing, surface finish testing, cutting force testing, and work process use are some of the quality testing methods that should be used regularly.

Comprehensive Analysis of cnc mill retrofit Costs: Including Visible and Hidden Costs

CNC mill retrofit costs can vary widely depending on the type of machine, the level of retrofit required, and the specific components being replaced or upgraded. Visible costs include the cost of new components such as motors, drives, and controllers, as well as the cost of labor for installation and programming. Hidden costs can include downtime for the machine during the retrofit process, lost production time, and the cost of any necessary training for operators or maintenance personnel.

In general, a basic retrofit for a small to medium-sized CNC mill can cost anywhere from $10,000 to $30,000, while a more extensive retrofit with advanced features such as automatic tool changers or high-speed spindles can cost upwards of $50,000 or more. These costs can be further increased if the machine requires significant modifications or upgrades to its mechanical components, such as replacing worn or damaged bearings or ball screws.

Other hidden costs to consider include the cost of downtime during the retrofit process, which can range from a few days to several weeks depending on the complexity of the retrofit and the availability of replacement parts. Additionally, lost production time during the retrofit process can result in lost revenue and increased costs for the business.

Finally, it is important to consider the cost of any necessary training for operators or maintenance personnel, as a retrofit may require new skills or knowledge to properly operate and maintain the machine. This can include training on new software or programming languages, as well as training on the operation and maintenance of new components such as motors or controllers.

Overall, the cost of a CNC mill retrofit can vary widely depending on a number of factors, and it is important to carefully consider both visible and hidden costs when evaluating the feasibility of a retrofit project.

Payment Terms for cnc mill retrofit and Bulk Purchase Discounts and Price Variances Among Suppliers

When it comes to retrofitting a CNC mill, payment terms can vary depending on the supplier. Some suppliers may require a deposit upfront, while others may offer payment plans or financing options. It is important to discuss payment terms with the supplier before committing to a retrofit to ensure that both parties are on the same page.

Bulk purchase discounts may also be available for CNC mill retrofits. This means that if a company is purchasing multiple retrofits at once, they may be able to negotiate a lower price per unit. It is important to inquire about bulk purchase discounts with the supplier to see if this option is available.

Price variances among suppliers can also be a factor when retrofitting a CNC mill. It is important to shop around and compare prices from different suppliers to ensure that the best deal is obtained. However, it is also important to consider the quality of the retrofit and the reputation of the supplier when making a decision.

In conclusion, payment terms for CNC mill retrofits can vary depending on the supplier, and it is important to discuss these terms before committing to a retrofit. Bulk purchase discounts may also be available, and it is important to shop around and compare prices from different suppliers to ensure the best deal is obtained.

Chinese Regulations and Industry Standards Certifications for cnc mill retrofit

In China, the CNC mill retrofit industry is regulated by various government agencies and industry associations. The main regulatory body is the State Administration for Market Regulation (SAMR), which oversees the certification and registration of products and services. The SAMR requires that all CNC mill retrofit products meet certain safety and quality standards before they can be sold in the market.

In addition to government regulations, there are also industry standards certifications that CNC mill retrofit manufacturers must obtain. The most important of these certifications is the ISO 9001 quality management system certification, which ensures that the manufacturer has a quality management system in place to ensure consistent product quality.

Other important certifications include the CE certification, which indicates that the product meets European safety standards, and the UL certification, which indicates that the product meets American safety standards. In addition, there are also certifications specific to the CNC mill retrofit industry, such as the CNC system certification and the CNC machine tool certification.

Overall, obtaining these certifications is crucial for CNC mill retrofit manufacturers to ensure that their products meet the necessary safety and quality standards, and to gain the trust of customers in the market.

Navigating Import Regulations and Customs for cnc mill retrofit from China

When importing a CNC mill retrofit from China, it is important to navigate the import regulations and customs to ensure a smooth and successful transaction. The first step is to research the import regulations and requirements of the destination country. This includes obtaining any necessary permits, licenses, and certifications.

Next, it is important to work with a reputable freight forwarder who can handle the logistics of shipping the retrofit from China to the destination country. The freight forwarder can also assist with customs clearance and any necessary documentation.

When shipping the retrofit, it is important to properly label and package the shipment to ensure it arrives safely and without damage. It is also important to accurately declare the value of the shipment for customs purposes.

Once the shipment arrives at the destination country, it will go through customs clearance. This process can take several days or even weeks, depending on the complexity of the shipment and the customs regulations of the destination country. It is important to be patient and work closely with the freight forwarder to ensure a successful customs clearance.

In summary, navigating import regulations and customs for a CNC mill retrofit from China requires careful research, working with a reputable freight forwarder, proper labeling and packaging, accurate declaration of value, and patience during the customs clearance process.

Procurement and Considerations when Purchasing cnc mill retrofit

When considering purchasing a CNC mill retrofit, there are several procurement and technical considerations that need to be taken into account. These include:

1. Budget: The first consideration is the budget. CNC mill retrofits can range from a few thousand dollars to tens of thousands of dollars, depending on the complexity of the retrofit.

2. Compatibility: The retrofit must be compatible with the existing mill. This includes the size, type, and age of the mill.

3. Technical specifications: The technical specifications of the retrofit must be carefully considered. This includes the accuracy, speed, and power of the retrofit.

4. Support: The level of support provided by the manufacturer or supplier is also an important consideration. This includes technical support, training, and maintenance.

5. Installation: The installation process must be carefully planned and executed. This includes the removal of the old components, installation of the new components, and testing of the retrofit.

6. Integration: The retrofit must be integrated with the existing control system. This includes the software, hardware, and communication protocols.

7. Performance: The performance of the retrofit must be tested and evaluated. This includes the accuracy, speed, and reliability of the retrofit.

Overall, purchasing a CNC mill retrofit requires careful consideration of technical specifications, compatibility, support, installation, integration, and performance. By taking these factors into account, manufacturers can ensure that they choose the right retrofit for their needs and budget.

Sourcing cnc mill retrofit from China: Opportunities, Risks, and Key Players

China has become a major player in the CNC mill retrofit market, offering opportunities for businesses looking to upgrade their equipment. The country’s low labor costs and advanced manufacturing capabilities have made it a popular destination for sourcing CNC mill retrofit components.

However, there are also risks associated with sourcing from China, including quality control issues and intellectual property concerns. It is important for businesses to thoroughly research potential suppliers and establish clear communication channels to ensure that their needs are met.

Some key players in the Chinese CNC mill retrofit market include Shenzhen Guanhong Automation Co., Ltd., Shenzhen Huaqiang Precision Machinery Co., Ltd., and Shenzhen Jiahao Technology Co., Ltd. These companies offer a range of retrofit solutions, including control systems, motors, and other components.

Overall, sourcing CNC mill retrofit components from China can offer cost savings and access to advanced technology, but it is important to carefully evaluate potential suppliers and establish clear communication channels to mitigate risks.

Cultivating Successful Business Relationships with Chinese cnc mill retrofit Suppliers

When it comes to doing business with Chinese CNC mill retrofit suppliers, it is important to understand the cultural differences and communication styles to cultivate successful business relationships. Here are some tips to consider:

1. Build trust: Chinese business culture values trust and relationships. Take the time to build a personal relationship with your supplier by visiting them in person, attending trade shows, and communicating regularly.

2. Respect hierarchy: Chinese culture values hierarchy and seniority. Show respect to your supplier’s senior management and decision-makers.

3. Be patient: Chinese business culture values patience and long-term relationships. Don’t rush negotiations or push for quick results. Take the time to build a relationship and understand your supplier’s needs.

4. Communicate clearly: Chinese culture values indirect communication and saving face. Be clear and concise in your communication, and avoid confrontational or aggressive language.

5. Understand cultural differences: Chinese culture values harmony and avoiding conflict. Be aware of cultural differences and adjust your communication style accordingly.

6. Be flexible: Chinese business culture values flexibility and compromise. Be willing to negotiate and find a mutually beneficial solution.

By understanding and respecting Chinese business culture, you can cultivate successful business relationships with CNC mill retrofit suppliers in China.

Sustainability and Environmental Considerations in cnc mill retrofit Manufacturing

Sustainability and environmental considerations are becoming increasingly important in the manufacturing industry, including CNC mill retrofitting. Retrofitting a CNC mill involves upgrading an existing machine to improve its performance, accuracy, and efficiency. This process can have a significant impact on the environment, both positively and negatively.

One of the main environmental benefits of CNC mill retrofitting is that it can help reduce energy consumption and greenhouse gas emissions. By upgrading the machine’s motors, drives, and controls, it can operate more efficiently, using less energy to produce the same output. This can result in lower energy bills and a smaller carbon footprint.

Another way CNC mill retrofitting can promote sustainability is by extending the lifespan of existing machines. Rather than replacing an entire machine, retrofitting can upgrade its components, allowing it to continue operating effectively for many more years. This reduces the need for new machines to be manufactured, which can save resources and reduce waste.

However, there are also potential environmental risks associated with CNC mill retrofitting. For example, the process may involve the use of hazardous materials, such as solvents and chemicals, which can be harmful to human health and the environment if not handled properly. Additionally, the disposal of old machine components can also be a challenge, as they may contain hazardous materials or be difficult to recycle.

To minimize these risks and promote sustainability in CNC mill retrofitting, manufacturers should prioritize the use of eco-friendly materials and processes. They should also ensure that all hazardous materials are handled and disposed of safely, and that old machine components are recycled or disposed of in an environmentally responsible manner.

Overall, sustainability and environmental considerations are crucial in CNC mill retrofitting and the manufacturing industry as a whole. By prioritizing eco-friendly practices and materials, manufacturers can reduce their environmental impact and promote a more sustainable future.

The Evolution and Market Trends in cnc mill retrofit Industry

The CNC mill retrofit industry has undergone significant evolution and market trends over the years. Initially, CNC machines were expensive and only affordable by large companies. However, with technological advancements, the cost of CNC machines has reduced, making them accessible to small and medium-sized enterprises.

One of the significant trends in the CNC mill retrofit industry is the adoption of automation. Automation has revolutionized the industry by reducing the need for human intervention, increasing accuracy, and reducing production time. The use of robots and other automated systems has also improved safety in the workplace.

Another trend in the CNC mill retrofit industry is the integration of cloud computing and the Internet of Things (IoT). The integration of these technologies has enabled manufacturers to monitor and control their machines remotely, improving efficiency and reducing downtime. The use of data analytics has also enabled manufacturers to optimize their production processes and reduce waste.

The CNC mill retrofit industry has also seen an increase in the use of 3D printing technology. 3D printing has enabled manufacturers to produce complex parts and prototypes quickly and cost-effectively. The use of 3D printing has also reduced the need for expensive tooling and reduced lead times.

In conclusion, the CNC mill retrofit industry has undergone significant evolution and market trends over the years. The adoption of automation, integration of cloud computing and IoT, and the use of 3D printing technology are some of the significant trends in the industry. These trends have improved efficiency, reduced production time, and increased accuracy, making CNC machines accessible to small and medium-sized enterprises.

The Role of Agents and Sourcing Companies in Facilitating cnc mill retrofit Purchases from China

Agents and sourcing companies play a crucial role in facilitating CNC mill retrofit purchases from China. These entities act as intermediaries between buyers and suppliers, helping to bridge the gap between the two parties and ensure a smooth transaction.

One of the primary benefits of working with agents and sourcing companies is their expertise in navigating the Chinese market. They have a deep understanding of the local business culture, language, and regulations, which can be challenging for foreign buyers to navigate on their own. This knowledge allows them to identify reliable suppliers and negotiate favorable terms on behalf of their clients.

Agents and sourcing companies also provide a range of value-added services, such as quality control inspections, logistics management, and customs clearance. These services help to mitigate the risks associated with importing goods from China and ensure that products meet the buyer’s specifications and quality standards.

Moreover, agents and sourcing companies can help buyers to save time and money by streamlining the procurement process. They can handle all aspects of the transaction, from sourcing suppliers to arranging shipping and handling payments. This allows buyers to focus on their core business activities and avoid the time-consuming and costly process of managing the procurement process themselves.

In conclusion, agents and sourcing companies play a critical role in facilitating CNC mill retrofit purchases from China. They provide valuable expertise, services, and support that help buyers to navigate the complexities of the Chinese market and ensure a successful transaction.

How to use import and export data website importyeti.com to search the company and cnc mill retrofit

ImportYeti.com is a website that provides import and export data of various companies. To search for a company and CNC mill retrofit, follow the steps below:

1. Go to ImportYeti.com and create an account.

2. Once logged in, click on the “Search” tab and select “Importers” from the drop-down menu.

3. In the search bar, enter the name of the company you are looking for and select the country of origin.

4. Click on the “Search” button to get a list of companies that match your search criteria.

5. To narrow down your search, use the filters provided on the left-hand side of the page. You can filter by product type, shipment date, and other criteria.

6. Once you have found the company you are looking for, click on their name to view their import and export data.

7. To search for CNC mill retrofit, use the same process as above but enter “CNC mill retrofit” in the search bar instead of the company name.

8. Use the filters to narrow down your search and find the companies that import or export CNC mill retrofit.

In conclusion, ImportYeti.com is a useful tool for searching for companies and products. By following the steps above, you can easily search for a company and CNC mill retrofit and get the import and export data you need.

How to use Chinese Business Search Platform: qcc.com to check cnc mill retrofit company credit

Qcc.com is a Chinese business search platform that provides information on companies registered in China. To check the credit of a CNC mill retrofit company, follow these steps:

1. Go to qcc.com and type the name of the company in the search bar. You can also search by the company’s registration number or its Chinese name.

2. Once you find the company, click on its name to view its profile. The profile will show you basic information about the company, such as its registered address, legal representative, and registered capital.

3. To check the company’s credit, click on the “Credit Report” tab. This will show you the company’s credit rating, which is based on its financial performance, payment history, and other factors.

4. You can also view the company’s business scope, shareholders, and other information by clicking on the relevant tabs.

5. If you want more detailed information, you can purchase a credit report or a company report from qcc.com. These reports provide in-depth analysis of the company’s financial performance, industry trends, and other factors that may affect its creditworthiness.

In summary, qcc.com is a useful tool for checking the credit of Chinese companies, including CNC mill retrofit companies. By following these simple steps, you can quickly and easily access important information about a company’s financial health and creditworthiness.

Overcoming Challenges and Facilitation of Sourcing cnc mill retrofit from China

Sourcing CNC mill retrofit from China can be a challenging task, but with the right approach, it can be facilitated. One of the main challenges is finding a reliable supplier who can provide quality products at a reasonable price. To overcome this challenge, it is important to conduct thorough research and due diligence on potential suppliers. This can involve checking their credentials, reading customer reviews, and requesting samples or prototypes to test the quality of their products.

Another challenge is communication and language barriers. To overcome this, it is important to find a supplier who has a good command of English or hire a translator to facilitate communication. It is also important to establish clear communication channels and expectations from the outset to avoid misunderstandings.

Facilitating the sourcing process can also involve leveraging technology and online platforms. There are many online marketplaces and sourcing platforms that can connect buyers with suppliers in China. These platforms can provide access to a wide range of suppliers and products, as well as facilitate communication and payment.

Finally, it is important to establish a strong relationship with the supplier. This can involve regular communication, building trust, and providing feedback on the quality of their products. By building a strong relationship, it is possible to establish a long-term partnership that can benefit both parties.

In summary, sourcing CNC mill retrofit from China can be challenging, but by conducting thorough research, leveraging technology, and building strong relationships with suppliers, it is possible to overcome these challenges and facilitate the sourcing process.

FAQs on Sourcing and Manufacturing cnc mill retrofit in China

1. What is CNC mill retrofit?

CNC mill retrofit is the process of upgrading an existing milling machine with new computer numerical control (CNC) technology to improve its performance and capabilities.

2. Why source and manufacture CNC mill retrofit in China?

China is a leading manufacturer of CNC machines and has a large pool of skilled labor and advanced technology. This makes it a cost-effective option for sourcing and manufacturing CNC mill retrofit.

3. How to find a reliable supplier for CNC mill retrofit in China?

One can find reliable suppliers through online marketplaces, trade shows, and referrals from industry experts. It is important to conduct due diligence and verify the supplier’s credentials before placing an order.

4. What are the common challenges in sourcing and manufacturing CNC mill retrofit in China?

Some common challenges include language barriers, cultural differences, quality control issues, and intellectual property concerns. It is important to work with a trusted partner who can navigate these challenges and ensure a successful outcome.

5. How to ensure quality control in CNC mill retrofit manufacturing in China?

Quality control can be ensured by conducting regular inspections and audits, setting clear specifications and standards, and working with suppliers who have a proven track record of quality and reliability.

6. What are the benefits of sourcing and manufacturing CNC mill retrofit in China?

The benefits include cost savings, access to advanced technology and skilled labor, and a wide range of customization options. China also has a large network of suppliers and manufacturers, making it easier to find the right partner for your needs.

cnc mill retrofit