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where do we hold the part in cnc machine

2023/05/10

Where Do We Hold the Part in CNC Machine?


Introduction

CNC machines are revolutionizing the manufacturing industry. They offer efficient and precise machining that is almost impossible to achieve with manual machines. One of the most critical aspects of CNC machine machining is the positioning of the part to be machined. Engineers and machinists need to know the right techniques for holding parts in the CNC machines to achieve the desired results.


Understanding CNC machines

CNC machines are highly versatile machines that are commonly used in the manufacturing industry. They are controlled by computers and can produce complex shapes with incredible accuracy. CNC machines comprise a range of machines, including milling machines, lathes, grinders, and drilling machines. The machines use advanced software to control the movements of the tool, and the cutting process is highly controlled.


How do CNC Machines Hold Parts?

CNC machines hold parts in different ways depending on the machine and the part being machined. Some of the common ways parts are held include:


1. Clamping

Clamping is the most common way of holding parts in CNC machines. This technique involves using clamps to hold the part in place on the worktable or a fixture. The clamps exert enough force to secure the part without damaging it. Some of the common clamping techniques include vices, jaw chucks, collets, and pressurized vacuum systems.


2. Fixtures

Fixtures are essential elements of CNC machine holding. They are used to hold the part in place on the worktable or a fixture. The fixtures are designed to be highly accurate and repeatable, which ensures that the parts are held in the same position every time. Some of the common fixtures used include vises, jigs, and fixtures.


3. Adhesives

Adhesives are used in CNC machining to hold soft materials such as plastics, rubber, and foam. The adhesive is applied to the surface of the material, and the part is attached to the worktable. The adhesives use high-strength bonding agents, which ensure that the part stays securely attached to the worktable during the machining process.


4. Magnetic Clamping

Magnetic clamping is another popular technique of holding parts in CNC machines. This technique uses strong magnetic forces to hold the part in place on the worktable. The magnetic forces are adjusted using controls, which makes it easy to position the part accurately. Magnetic clamping is an effective way of holding parts that would be difficult to hold using other techniques such as clamping or fixtures.


5. Vacuum Fixtures

Vacuum fixtures are used in CNC machines to hold thin and flat parts. The vacuum fixture uses a vacuum pump to create a vacuum between the worktable and the part being machined. The vacuum pulls down the part, which ensures that it is held securely on the worktable. Vacuum fixtures are highly accurate and repeatable, making them an ideal choice for holding thin and flat parts.


Conclusion

CNC machining is an essential process in the manufacturing industry, and proper part holding is crucial for the machining process to be successful. There are many different techniques for holding parts in CNC machines, each with its own advantages and disadvantages. Engineers and machinists need to understand these techniques to choose the best way of holding parts for a specific application. The right choice of part-holding techniques can help to improve the accuracy and efficiency of the CNC machining process.

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