Water Supply - Diamond Products CB744 Operator's Manual

OPERATING INSTRUCTIONS
1) MOUNTING THE CORE BIT
CAUTION: Ensure that the threads of the spindle and the core bit match. Attempting to mount
mismatched threads will result in damage to both threads.
The spindle has two types of threads. The outside male thread is 1-1/4inch UNC, the inside female thread is 1/2
inch BSP. Ensure both the core bit and the machine spindle are clean. Any debris could cause excessive run-out
of the mounted core bit. Excessive run-out can cause premature failure of the core bit and/or a safety hazard.
Tighten the bit to the spindle using two wrenches. Only use correct sized wrenches to avoid damage to the
spindle or bit. Torque to at least 200 newton meters
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.
We recommend always using wet-type (sintered) bits with this machine.
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.
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.

2) WATER SUPPLY

Water is a basic requirement for 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.
Open
Water should always be used to cool and lubricate the bit and to flush out
Water Feed Valve
abrasive particles formed while drilling. Never use this machine without
Closed
water feed.
To connect the water supply. Attach the quick-release water coupling to a
water hose.
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