The difference between straight groove and spiral of pagoda drill

1. Chip removal method
Straight groove drill:
The groove type is a straight channel, and the chips are discharged downward by gravity or coolant pressure, which is suitable for through-hole processing. However, it is easy to clog in deep holes or soft materials, and frequent chip removal is required.

Spiral groove drill:
The spiral structure pushes the chips to rotate upward (similar to the principle of screws), which has obvious advantages in blind hole processing, reduces chip entanglement, and improves continuity.

⚙️ 2. Processing performance
Advantages of straight groove drill:

High aperture accuracy: Straight groove reduces vibration, hole roundness/straightness is better, and it is suitable for precision stepped holes.

Suitable for soft materials: Low friction in soft materials such as wood and plastic to avoid overheating and burns.

Advantages of spiral groove drill:

Efficient cutting: Stable at high speed (up to 10 times the speed of spiral groove drill), suitable for batch processing of hard materials such as metals.

Strong versatility: The helix angle is adjustable (large angle is suitable for soft materials, small angle is suitable for hard materials), adapting to different working conditions.

📌 3. Applicable scenarios
Choose a straight groove drill:

Through hole processing, precision drilling of soft materials such as woodworking/plastics.

When the coolant pressure is sufficient (relying on internal cooling to remove chips).

Choose a spiral groove drill:

Blind holes, deep holes and hard materials such as metal/cast iron processing.

High-speed continuous operation scenarios (such as automated production lines).

⚠️ 4. Precautions for use
Straight groove drill:
The tool is easy to break at low speeds, and the feed rate needs to be controlled; the chip removal space is small, and chips need to be cleaned regularly.

Spiral groove drill:
When processing materials with good ductility (such as aluminum), a high-pressure cooling system is required to avoid clogging by long chips