Chip pocket
In deep hole tapping, it is necessary to reduce the number of tap grooves to increase the chip space of each groove. In this way, when the tap retracts, more iron filings can be taken away, reducing the chance of damage to the tool due to clogging of the iron filings. On the other hand, the increase in the tap chip pocket reduces the core diameter and, therefore, the tap strength is affected. So this will also affect the cutting speed. In addition, the spiral groove tap is easier to chip than the straight groove tap. 
Front and back corners
The small rake angle increases the cutting edge strength and thus increases tool life; while the large rake angle facilitates cutting long chip metal. Therefore, in the processing of titanium alloy, it is necessary to comprehensively consider these two factors, and select a suitable rake angle. 
The large relief angle reduces the friction between the tool and the chip. Therefore, it is sometimes required that the taper angle be 40°. When processing titanium metal, a large relief angle is ground on the tap to facilitate chip evacuation. In addition, full-grinding taps and taps for back grinding are also beneficial for tapping.
Coolant When processing special materials, it must be ensured that the cutting fluid reaches the cutting edge. In order to improve the flow rate of the coolant, it is recommended to open a cooling groove on the back of the tap. If the diameter is large enough, an internal cooling tap can be considered.
3. Application examples
An aircraft parts manufacturer needs deep hole tapping on one part. The part material is a grade 7 titanium alloy. During processing, the circumferential cutting speed was 13 inches per minute while using a coolant. 
In order to ensure the accuracy of the parts, the operator should replace them in time before the taps are blunt. When the tap wears, the sound produced during the cutting changes. By listening to these sounds, the operator can determine the number of threaded holes that can be machined before the tap wears before machining. 
The plant has two tapping stations on each tapping device, equipped with the same tap. When one of the taps is worn, it can be easily replaced in time.
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