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CDM1H CORE DRILL — OPERATION AND PARTS MANUAL — REV. #6 (09/08/10) — PAGE 13
CDM1H HAND-HELD CORE DRILL — PRE-SETUP
Before Starting:
CAUTION - Read Manual
Before attempting to operate
this core drill, and to avoid
serious injury to personnel,
always read and understand
operation manual. Failure to
read and understand operation
manual could result in serious
harm or even death!
NEVER operate the core drill in a confined
or enclosed area structure that does not
provide ample
free flow of air
.
Warning - Toxic Fumes
DANGER - Flammable/Combustible Materials
NEVER operate the core drill in or around
flammable materials. The core drill emits
sparks, if contact is made between the
sparks and the flammable material,the
posibility exists of fire or explosion causing
damage to the equipment and severe bodily
harm even death!
Drilling with a MQ Cobra™ Bit
The drilling of clean holes with Cobra™ core bits (1) requires an
operating technique utilizing the center drill bit adapter (2). Center
drill bit adapters are included with the core bit. As bits wear out,
this adapter may be used with future core bits of similar depth
and diameter. The adapter bit permits an anchoring point (3) so
the bit can be accurately introduced into the surface (4). Once
the hole is started, the center drill bit adapter (2) must be removed.
See Figure 4.
Figure 4. Drilling with a MQ Cobra™ Bit
Drilling With Standard DRY/WET Core Bits
With the proper adapter, 1" to 3" diameter dry/wet core bits can
be used with the CDM1H when drilling vertical and horizontal
holes. All hand-held core drills require practice and operator
technique to ensure consistent clean drilled holes. When using
wet core bits, water MUST be used to ensure proper cooling.
“Bit chatter” around the hole can be eliminated by various
techniques such as angle-entry procedures and fabricated
guides. Angle-entry is one safe and simple way to start the bit
onto the surface. Angle the bit (1) at 10°-15° above the surface
and slowly introduce the bit until it is flush with the surface (2).
See Figure 5.
Figure 5. Drilling with a Standard DRY/WET Core Bit