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7. Dust collector (B)
When drilling holes overhead, dust collector (B) (optional accessory) can be mounted on the Model
DH 22PG 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 socket adapter (B) rotates 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,
friction 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 tuning 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 glasses. 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. 8 Dust collector (B) structure
