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PAGE 16 — CDM1H CORE DRILL • OPERATION AND PARTS MANUAL — REV. #7 (10/12/17)
SET-UP
DRILLING WITH A MQ COBRA™ BIT
Drilling clean holes with the MQ Series COBRA II bits is
best supported by an operating technique that involves the
unit’s pilot bit, and patient operator technique. COBRA II
bits can be ordered with or without pilot bits. To overcome
“bit chatter”, it is highly recommended to utilize the COBRA
II pilot bit to provide an anchoring point so the bit can
accurately enter the surface of the material. See Figure 4.
Figure 4. Drilling with an MQ Cobra
™ II
Core Bit
NOTICE
DO NOT attempt to operate the core
drill until the Safety Information, General
Information and Inspection sections
of this manual have been read and
thoroughly understood.
DANGER
NEVER operate the core drill in or around
flammable materials. The core drill emits
sparks, if contact is made between the
sparks and the flamable material,the
posibility exists of fire or explosion
causing damage to the equipment and
severe bodily harm even death!
WARNING
Adherence to the OSHA 2017 Ruling governing
Occupational Exposure to Respirable Crystalline
Silica, requires that all core drilling operations
MUST
BE conducted with an integrated water delivery system
that feeds water to the drill bit.
2
1
4
3
5
5
6
Thread the 5/8”-11 adapter (2) to the Core Drill (1), thread
the COBRA II Bit w/ pilot (3) (4) onto the Drill. The pilot bit
acts as an anchoring point so the bit can be introduced
into the material (6). Once the hole is started, remove the
bit and unthread the pilot bit from the Core Bit. Re-thread
the Core Bit back onto the Drill and finish the drilling job.
DRILLING WITH OTHER CURED CONCRETE,
ASPHALT AND MASONRY CORE DRILL BITS
Utilizing the proper adapter, the CDM1H will support many
standard core drill bits (1” to 3” diameter cured concrete and
asphalt – 1” to 6” Blockbuster Cinder Block bits). Because
these types of core bits are not designed to use pilot bits,
the operator will require practice and technique to ensure
clean entry of the bit into the material. ‘Bit chatter’ can be
avoided by mastering an angle-entry approach. Angle the
bit (5) 10º to 15º above the surface of the material (6) and
slowly introduce and rotate the bit and increase the drill
RPM speed. See Figure 5.
Figure 5. Drilling with a Standard Core Bit
WARNING
NEVER operate the saw in a confined
area or enclosed area structure that
does not provide ample
free flow of
air
5
6
5
Summary of Contents for CDM1H
Page 22: ...PAGE 22 CDM1H CORE DRILL OPERATION AND PARTS MANUAL REV 7 10 12 17 WIRING DIAGRAM ...
Page 23: ...CDM1H CORE DRILL OPERATION AND PARTS MANUAL REV 7 10 12 17 PAGE 23 NOTES ...
Page 26: ...PAGE 26 CDM1H CORE DRILL OPERATION AND PARTS MANUAL REV 7 10 12 17 NAMEPLATE AND DECALS ...
Page 35: ...CDM1H CORE DRILL OPERATION AND PARTS MANUAL REV 7 10 12 17 PAGE 35 NOTES ...