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8-5. Drill Bits
The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in
Fig. 5. Rotating torque is transmitted to the drill bit by two key rails provided in the tool holding section. A steel
ball is used to prevent the bit from falling out.
Key slot (two pieces)
Key rail (2 pcs.)
Shape of SDS-plus shank bit
Ball holder
Steel ball
Section A - A'
Cylinder
Fig. 5
The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete with a
depth of 30 mm. If reground before the end of its service life, the drill bit will continue to provide efficient drilling.
Figure 6 shows the regrinding angle.
Regrinding angle of drill bit
a:b = 1:2
Rotation
direction
Section A - B
Section of the chuck section
Fig. 6
130
û
A
A'
