Insufficient cutting force

Insufficient cutting force is the primary reason for the failure to cut threads with a helical tap. This can be checked and resolved through the following aspects:

Inadequate Oil Supply: If the oil supply system is blocked, the tool will experience significant friction due to poor lubrication, leading to difficulty in threading. In this case, you can clean the oil supply hole or replace the lubricating oil.

2. Insufficient Pressure: The process of helical tap threading requires a certain amount of pressure. If the pressure is insufficient, it can lead to a smooth threading process. At this point, it is necessary to check if the pressure mechanism is functioning properly; if it is damaged, it will require repair or replacement.

3. Excessive Tool Edge Wear: If the spiral tap is used for an extended period, the tool edge will lose cutting power due to excessive wear, at which point it needs to be resharpened or replaced.

Poor cutting conditions

In addition to insufficient cutting force, another reason for the failure of spiral tap to cut threads is poor cutting conditions, which mainly include the following aspects:

Material Hardness Too High: If the material hardness is too high, the tap cannot cut smoothly, and it is necessary to choose a tap with higher hardness or reduce the material hardness.

Improper coolant selection or use: During the threading process with spiral taps, it is essential to use coolant. Improper selection or usage can cause the tap to overheat during cutting, affecting the cutting performance. In such cases, it is necessary to replace with a suitable coolant or use the coolant correctly.

3. Slow or Fast Feed Rate of Thread Cutting: A slow feed rate can lead to excessive wear on the tap during cutting, thereby losing its cutting ability. Conversely, a fast feed rate can cause excessive vibration during cutting, affecting cutting accuracy and quality. Adjusting the feed rate is necessary in such cases.

In summary, there are many reasons why a spiral tap may fail to cut threads, but most issues can be resolved through inspection and maintenance. When using spiral taps, it is crucial to select appropriate cutting conditions and replace the tooling promptly. Additionally, regular checks and maintenance are essential to ensure the proper functioning and processing efficiency of spiral taps.