MK Diamond MK-MANTA III User Manual

Page 13

Steady, even pressure assures accurate holes and longer bit life. Always maintain consistent pres-

sure so that the bit is constantly cutting.

An adequate supply of clean water is necessary for drilling. Connect the water supply hose to the

hose fitting on the output of the core drill motor. Take precautions that the water supply will not be

interrupted during the drilling operations.

It is essential that the carriage fits snugly on the column to prevent the motor or bit from wobbling dur-

ing drilling. Through normal use the carriage may loosen from the column and begin to wobble. Be-

fore drilling, always make sure the carriage is rigid by trying to wiggle it with your hand. If the carriage

is secure it should not move. If it does move, tighten the adjustment. Tighten only enough to remove

the play. Do not over tighten.

The MK-Manta III Core Drill uses either a shear pin or a friction clutch to protect the gear and motor

against overload. The shear pin drives the outer portion of the drive spindle. If the motor should over-

load the pin will shear. Extra shear pins are supplied or can be ordered from MK Diamond’s Customer

Service. Tighten only enough to remove the play, do not over tighten. Another model features a fric-

tion clutch rather than a shear pin to protect the motor and gears. If the motor overloads the clutch will

begin to slip and the bit will stop rotating. The clutch is factory-set and does not require adjustments.

However, under normal use, the clutch may start to slip at low torque. If this happens, refer to the mo-

tors Owner’s Manual.

Too much pressure will damage the bit and motor. Too little pressure will glaze over the

diamonds, reducing cutting efficiency and prematurely wearing the bit. The ammeter is

the gauge on the Control Box. It provides pressure feedback information during drill-

ing, allowing the operator to help prevent motor overload and premature bit wear. The

green areas are the operating range, and the red area is the overload range. Generally,

the operator should keep the ammeter needle in the upper area of the operating range

for large diameter bits, and in the lower green area for small diameter bits. If the bit

contacts steel reinforcing rods, the needle on the ammeter may jump slightly showing

a heavier load. If this occurs, do not decrease pressure or you may damage the dia-

monds. The MK-Manta III Core Drill may be operated with the ammeter needle into the

red area for the short period of time that it takes to cut through a steel rod.

If a bit is run dry it can be ruined in a few seconds.

DRILLING PRESSURE AND THE AMMETER

WATER SUPPLY

CARRIAGE RIGIDITY

SHEAR PIN AND CLUTCH PROTECTION

NOTICE:

MANTA CORE DRILL III

OPERATION

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