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8-7. Dust Collector (B)
When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24DVA to prevent dust and
chips from falling downward. Dust collector (B) is intended solely for use when drilling holes in concrete, and
cannot be used for drilling holes in steel or wood. It is designed for use with drill bits with overall length of
166 mm, 160 mm and 110 mm, and cannot be used with any longer bits. When using a drill bit with an overall
length of 166 mm with dust collector (B), drilling up to a depth of approximately 72 mm is possible. When using
dust collector (B), ensure it is securely fastened to the grip on the main body with socket adapter (B).
Although the socket and socket adapter (B) rotate together with the tool shank, there is a steel ball between the
outer race and the socket which serves as a ball bearing. Should the dust cover be forced against the concrete
surface, it will not rotate even though the tool shank continues to rotate. Should the tool be operated when the
dust cover is not being held against a concrete surface, inertia may cause dust collector (B) to become
disconnected from the grip. Accordingly, caution the customer to press dust collector (B) and drill bit firmly against
the concrete surface before turning on the switch to start drilling.
When dust collector (B) is used, almost no dust and chips are scattered about. However, since the chips and dust
remaining in the collector may scatter after completion of the drilling operation, the customer should be advised to
always wear protective eyeglasses.
When dust collector (B) is disassembled for repair or maintenance, be very careful to prevent oil or grease from
adhering to the steel balls. Grease or oil on the steel balls may cause concrete dust to enter the unit and cause
defective rotation.
Fig. 15 Dust collector (B) structure
