where do we hold the part in cnc machine

Where Do We Hold the Part in CNC Machine?

CNC (Computer Numerical Control) machines are widely used in various industries today to manufacture precise parts with high accuracy. These machines rely on programmed instructions to control the cutting tools and transform a raw piece of material into the desired finished product. However, before the cutting process begins, the part needs to be secured in a specific location in the machine. This raises a critical question for many operators: where do we hold the part in CNC machine? In this article, we will discuss the various methods of holding the part and their advantages.

1. Clamping

One of the most common methods of holding the part in CNC machine is clamping. Clamping involves the use of a clamping device such as a vice or a fixture to hold the part tightly in place. The clamping device is either bolted onto the machine table or secured through a vacuum system. Clamping is an effective method for smaller and medium-sized parts that have flat and uniform surfaces. Clamping ensures that the part stays fixed during the machining process, leading to higher precision and accuracy.

2. Chucks

Chucks are another commonly used method for holding the part in CNC machine. Chucks are circular devices that are fastened onto the spindle of the machine. A chuck has jaws that can be adjusted according to the size and shape of the part. Chucks are ideal for holding round and cylindrical parts such as pipes, tubes, and shafts. Chucks can be manual or power operated, depending on the size and complexity of the part. Chucks offer excellent stability and precision and are commonly used in lathes and turning centers.

3. Collets

Collets are similar to chucks but are more specialized in their application. Collets come in different sizes and shapes to fit specific parts. Collets have internal grips that hold onto the part securely. Collets are ideal for holding smaller and delicate parts that require high precision and accuracy. Collets can be manual or power operated, depending on the type of machine and part.

4. Machine Cams

Machine cams are used in CNC machines to hold intricate parts that require repetitive machining operations. Machine cams are similar to the cam mechanisms used in automobiles, but in this case, they are custom designed to hold specific parts. Machine cams hold the part in place and simultaneously trigger the cutting tools to perform the machining operation accurately. Machine cams are ideal for mass production and are commonly used in the automotive and aerospace industries.

5. Magnetic Chucks

Magnetic chucks are used in CNC machines to hold metallic parts securely. Magnetic chucks rely on magnetism to hold the part in place. The magnetic force is generated through a series of tiny magnets that are electrically activated when required. Magnetic chucks are ideal for holding non-flat and curved parts that require high precision and accuracy. Magnetic chucks are quick and easy to use and do not require any clamping or manual adjustments.

Conclusion

In conclusion, the method of holding the part in CNC machine largely depends on the size, shape, and complexity of the part being machined. Clamping, chucks, collets, machine cams, and magnetic chucks are the most commonly used methods to hold the part in CNC machine. Each method has its advantages and disadvantages, and the operator needs to choose the appropriate method according to the part and the machine being used. Properly holding the part in CNC machine ensures that the machining process is accurate, efficient, and yields the desired finished product.