User Manual

8
Choosing the correct core bit for the job:
Ensure that the bit you are using is suitable for the material you are drilling. There are two main types of
diamond core bit:
Wet/dry type-electroplated (surface set) diamond core bits and wet type-sintered (impregnated)
diamond core bits.
Dry drilling models should only use Dry type bits:
Electroplated bits, also known as wet/dry type, are only suitable for less hard materials. The diamonds are sharp
and coarse and are only set on the surface. They have a much shorter service life than sintered bits and cannot
be dressed (resharpened). Once they become dull, they must be replaced. They tend to work well with softer,
abrasive materials like brick. Only dry type bits are suitable for use with soft impact function.
Wet drilling models are reccomended to use Wet type bits:
Sintered bits, also known as wet type, are much longer lasting but require operator knowledge for best results.
Water is absolutely always required with sintered bits. The bit is impregnated with many layers of diamond in
its metal matrix. As the matrix (bond) wears, new diamonds are exposed. If the bit becomes glazed, it can be
resharpened by dressing with an appropriate alumina oxide or silicon carbide dressing stick. There are many
variables with sintered diamond core bits, such as diamond grade and type, diamond grit size, bond type,
bond hardness, and bit wall thickness. Consult with your diamond core bit supplier for the best bit for your
application. Work materials vary widely in hardness.
CAUTION: Wet type bits must never be used with percussion function
SPECIAL INSTRUCTIONS FOR WET DRILLING
(Wet drilling models only)
Water is a basic requirement for wet diamond core drilling. The water serves as
a coolant to avoid the working surface at the tip of the bit from overheating.
When the diamond bit becomes overheated, both the bond matrix and even
the diamonds break down. The most frequent cause of diamond core bit
damage is caused by drilling without enough coolant water.
Water should always be used to cool and lubricate the bit and to flush out
abrasive particles formed while drilling.
To connect the water supply. Attach the quick-release water coupling to a
water hose.
WARNING: Never allow water to enter the motor. It could lead to an electric shock.
WARNING: Check all connections of the water feed system to ensure there are no leaks. Inspect hoses
and other critical parts which could deteriorate.
WARNING: The maximum water pressure should not exceed 70 psi (4 bar).
Use a water collector with a wet vacuum to collect cooling water if nearby objects could be damaged by water.
WARNING: Never allow water to enter the motor. A perfectly functioning water collector set up must be
used for any drilling performed at an upward angle.
Open
Closed
Water Feed Valve