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10
MANTA I
Revision 03/05, Effective Date March 2, 2005
11
MANTA I
Revision 03/05, Effective Date March 2, 2005
Mounting Bits
Drilling Procedure
Carriage Rigidity
Shear Pin and
Clutch Protection
It is essential that the carraige fits snugly on the column to prevent the motor or
bit from wobbling during drilling. Through normal use the carraige may loosen
from the column and begin to wobble. Before drilling, always make sure the
carraige is rigid by trying to wiggle it with your hand. If the carraige is secure it
should not move. If it does move, tighten the adjustment screws for the nylon
gibs that secure the carraige to the column.
Tighten only enough to remove the play. Do not over tighten.
The MK-Manta I 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 overload 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 friction 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
motors Owner’s Manual.
Bits with permanently attached adapters simply screw directly onto the threads
of the drill spindle. Ensure that the end of the bit butts up squarely against the
shoulder on the spindle.
The MK-Manta I has a 1 1/4”-7 thread. For bits with other threads, use a shaft
coupling. After a bit has been mounted, turn the power on and check that there
is a minimum of run-out or wobble.
To reduce the risk of injury, always unplug tool before attaching or removing
accessories. Only use specifically recommended accessories. Others may be
hazardous.
When drilling through concrete floors, the core will generally drop from the
diamond bit. Caution should be provided for people and property below the
drilling area.
1. Ensure that you have read and fully understand the complete operation of the
MK-Manta I you have purchased prior to commencing drilling operations.
2. Select and install a diamond core bit appropriate for the job. Note: Grease the
bit threads to help prevent the bit from seizing on the spindle due to rust.
3. Select either high or low gear speed according to the chart in the Drilling
Speeds section of this manual. (Do not shift speed when motor is on.)
4. Connect water hose to water swivel.
5. Secure the rig as described in the Securing the rig section of this manual.
WARNING
!
WARNING
!