Thread Design Rules In CNC Machining

DALIAN, China - April 7, 2024 - PRLog -- The internal thread is located inside the main component and locks the screw and bolt threads.

Bolt Spacing

Once we consider the threads on bolts and screws, there is no one size applicable to all types. In addition to metric threads, the Unified Thread Series also includes major British threads such as UNC (coarse thread), UNF (fine thread), UNEF (extra fine thread). When you apply our system to assign specific threaded holes, the required pitch will come with it.

Thread Position

Usually, threads can be placed anywhere as part of your assembly requirements for turning or milling. As long as our equipment has access to that area. But if there are obstacles, our design analysis system will notify you which position cannot be threaded. It is always a good idea to follow our design guidelines in order to save your design time and costs.

Even if there are fewer restrictions on thread placement, the depth of internal threads is still a key factor to consider. Once the thread depth exceeds the maximum machining depth, the only method is to drill both sides of the hole and complete this process. In this case, there is another issue where the thread is not continuous from one end to the other.

For turning parts, we offer three types of holes to accommodate internal threads:

On the shaft: The hole passes straight through the center of the part from one end.

Axial: The hole is formed at one end through the part without a central area.

Radial: Holes are formed through the external behavior of the part.

Internal thread

We usually use single lip thread cutting tools to machine internal threads instead of traditional thread taps. You need to retain the guide diameter on the CAD model and remove the actual thread. We will analyze threaded holes in the following situations:

• The aperture is within the required thread range
• These holes are located on one of the three basic axes used for milling
• These holes are perpendicular to the turning rotation axis
• The position and manufacturing method of the hole will limit the qualification of the thread.

During the internal machining process, the hole depth may be longer than the maximum length of our threading tool. In this case, we will recommend some options based on your special requirements.

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