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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. 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.
We recommend always using wet-type (sintered) bits with this machine.
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.
Never use this machine without water feed.
To connect the water supply. Attach the quick-release water coupling to a
water hose.
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.
3) SELECTING SPEEDS
There are various ranges to suit the bit size and work piece hardness.
CAUTION: Never attempt to change gears on a running machine! Only adjust when the machine is
at rest.
For 3 speed models, Select the desired gear range by turning the gear selector either clockwise or
counterclockwise into the desired gear. It will usually be necessary to turn the spindle by hand a little to get it
to shift all the way.
For 4 speed models, turn the two gear selectors to the correct combination of A,B,C and D to reach the desired
speed range. (see the chart below).
Indicator Holes
Water Feed Valve
Open
Closed
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