how to hold small parts on cnc

Holding Small Parts on CNC Machines

CNC machines are one of the most versatile tools in the manufacturing industry. CNC machines can be used in projects ranging from hobby activities to large-scale manufacturing processes. While CNC machines can be an excellent tool for productivity, the challenge comes making sure that small parts are held firmly in place during machining operations.

In this article, we will explore some of the techniques for how to hold small parts on CNC machines.

1. Using a Vacuum Chuck System

A vacuum chuck system is an excellent way to hold small parts securely in place during CNC machining operations. In this approach, a vacuum pump is used to create suction, which secures the parts in place. Vacuum chucks are ideal if the surface of the part is flat. It is easy to set up these chucks as they require no clamping operation, which can become a headache when working on small parts. They are also preferred for non-conductive materials such as plastic or wood.

2. Using Magnetic Chucks

Magnetic chucks are another option for holding small parts during CNC machining. Magnetic chucks are good if the material being machined is ferrous or magnetic. The magnetic force pulls the part down, securing it in place. Magnetic chucks can be a bit tricky, particularly with ferrous oxide between the surfaces.

3. Using Clamps

Clamps are another handy, straightforward way to hold small parts in place during CNC machining operations. When working with parts using clamps, ensure the parts are well supported, especially where the clamp applies pressure. It is critical to select an appropriate type and size of the clamp for the component, so the surface finish is not damaged.

4. Using Double-Sided Tape

For parts with intricate shapes and small details, double-sided tape is an excellent choice as it allows the part to be held down with little stress since it doesnt add any stiffness to the system. Additionally, double-sided tape is useful when machined parts will require further fabrication like sheet-metal bending or folding.

5. Using Adhesive

Using adhesive is another option for holding small parts on CNC machines. In this scenario, a bonding agent is applied to the part's surface, and the part is then secured to the fixture surface until it dries. Although adhesive is an excellent way to hold small parts, it can be a bit messier than other methods.

Conclusion

With the right techniques, holding small parts on CNC machines can be relatively easy. Depending on the part, there are many ways to achieve a secure hold on a part, including vacuum chuck systems, magnetic chucks, clamps, double-sided tape, and adhesive. As a general rule, you should always choose the method that will minimize machining stress, surface deformation, or part deflection. By doing this, you ensure that your CNC machining projects are of high quality and produce precise results every time.