The Importance of Tapholes in Metal Tapping

Tapholes are small holes that are drilled in the metal workpiece during the tapping process. These holes are used to guide the tap as it cuts the threads into the metal. The tapholes are typically drilled before the tap is inserted, and they should be deep enough to allow the tap to reach the bottom of the hole without breaking through the other side.

Tapholes serve several purposes:

1. Guidance for the tap: The tapholes provide a clear path for the tap to follow as it cuts the threads, ensuring that the tap stays on track and doesn't wander or slip.
2. Prevention of thread damage: By drilling tapholes that are slightly smaller than the tap, the risk of damaging the threads during the tapping process is reduced. This helps to prevent the tap from cutting too deeply into the metal and causing damage or deformation.
3. Improved thread quality: The tapholes help to ensure that the threads are cut consistently and accurately, resulting in a higher-quality thread that is less likely to loosen over time.
4. Reduced risk of tap breakage: By providing a clear path for the tap, the tapholes reduce the risk of the tap breaking off inside the hole during the tapping process. This can save time and money by reducing the need for costly tap replacements.