豆知識

2021.05.18

Woodworking drill bits

The name of place and role

Blade diameter (size) : It is a size that can be drilled.
Tip shape : ・ Tip screw (lead screw)
It does not require a pushing force because it is a part that generates a pulling force during cutting.
Marking blade (claw) : Located on the opposite side of the rake blade, and injuring in a circular motion when opening.
Scooping blade : It is the main blade that scoops up wood chips by scraping with a marking blade.
Spiral part : The wood chips scooped up with the scooping blade play the role of hanging the spiral part and discharging the wood chips.
Shaft diameter : This is the part where the shaft part is attached to the power tool. There are hexagonal shaft, round shaft, and three-groove SDSplus shaft in shape. The power tool will change depending on the difference in shaft diameter and shaft shape, so check it before mounting it on the power tool.
Core : The trunk of the drill to reduce core shake.
Outer circumference : Since the outer circumference is polished, the back taper is applied, making it easier to enter and remove.

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