There are several ways to reduce costs when producing parts on CNC machines, including:

1. Optimizing machining parameters: Optimize machining parameters such as cutting speed, feed rate, and depth of cut to reduce machining time and improve tool life.
2. Using high-performance cutting tools: Use high-performance cutting tools such as carbide inserts that have a longer life, which can reduce the need for frequent tool changes and downtime.
3. Implementing tool management: Implement a tool management system to keep track of tool inventory, usage, and replacement. This can help you to avoid running out of tools and to reduce the cost of purchasing new ones.
4. Implementing preventative maintenance: Implement a preventative maintenance program to keep the machines in good working condition and to avoid costly repairs.
5. Reducing setup time: Reduce setup time by using quick-change tooling systems, jigs and fixtures, and by streamlining the workholding process.
6. Utilizing automation: Utilize automation such as robotic arms, pallet changers, or conveyors to increase efficiency and reduce labor costs.
7. Reducing energy consumption: Reduce energy consumption by using energy-efficient motors, drives, and other components.
8. Reusing scrap material: Reuse scrap material by recycling it or by using it in other applications.
9. Utilizing efficient CAD-CAM software: Utilize efficient CAD-CAM software that can generate efficient tool paths, and optimize the machining process.
10. Outsourcing non-critical operations: Outsourcing non-critical operations such as finishing or heat treatment to specialized service providers, to reduce costs and improve efficiency.

It’s important to note that cost reduction is a continuous process, and it requires constant monitoring and improvement of the production process. By identifying areas where costs can be reduced and implementing cost-saving measures, it’s possible to produce parts on CNC machines more efficiently and at a lower cost.