User Manual

8
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.
Water should always be used to cool and lubricate the bit and to flush out
abrasive particles formed while drilling. Never use this machine without
water feed.
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).
CAUTION: There is a small indicator hole on the water feed collar. If this
hole leaks water, it indicates that the water seals are worn out. Replace
them immediately.
CAUTION: Never use this machine without water feed. Running dry will
overheat and destroy its water seals.
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.
3) SELECTING SPEEDS
There are various ranges to suit the bit size and work piece hardness. Choose the slowest speed for large
diameter bits and hard materials. If when cutting the bit stalls repeatedly, then you must change to a lower
gear. If you are already in the lowest gear and the bit stalls repeatedly, then you are using the machine over its
maximum capacity.
Open
Closed
Water Feed Valve
Indicator Holes