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User manual Grizzly, model MK-Manta I

Manafacture: Grizzly
File size: 1.29 mb
File name: 27734e51-e1a8-4acb-8a79-be1af030ba20.pdf
Language of manual:en
Free link for this manual available at the bottom of the page

manual abstract

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. Shear Pin and Clutch Protection Mounting Bits WARNING ! WARNING ! Drilling Procedure WARNING ! If using the vacuum base, do not continue operations unless the vacuum gauge reads more than 20 inches of mercury. Normally, the gauge will read 23 inches or more. 6. Turn the motor switch on the Control box ON. Turn the water ON so that an adequate flow of water is supplied through the water swivel, to the bit. Hold the handle and slightly loosen the carriage lock knob. Slowly rotate the handle to lower the bit into the work piece - apply steady even pressure. Note: To prevent the bit from wandering, always use a light load to start the hole and wait for the diamond tip of the bit to penetrate the work surface before increasing the load. 7. Use consistent pressure so that the bit cuts consistently. Insufficient pressure will cause the diamond core bit to glaze over. Too much pressure will overload the motor and crush the diamonds. Use the ammeter on the Control box as a guide for proper pressure. If the rig shifts during drilling, stop the motor, reposition the rig, and resume drilling. 8. Monitor the water flow. If the water flow is adequate, the water leaving the cut should be slightly sludgy. When cutting metal rebar, the water should have a gray metal coloring. Notice: When drilling into prestressed concrete the bit may cut into the hardened steel cable under tension. As the bit cuts through each strand, the tension in the cable is released. The diamond segments on the bit crown can be damaged by the loose wires. The best prevention for bit damage is to use a core bit designed especially for drilling in prestressed concrete. 9. When the cut is complete, keep the drill motor on and rotate the handle to bring the bit up out of the hole. The bit may become stuck if the motor is turned off before the bit is completely clear of the hole. Once the bit is clear of the hole, tighten the carraige lock knob, turn off the motor and the water supply. Note: Normally the core will drop out of the bit, and remain in the hole. However, in cases where the core sticks in the bit, it is sometimes necessary to push the core up and down with the water running to allow the core to drop out. Sometimes very light tapping on the barrel of the bit with a piece of wood will loosen the core. Perform this action only with the motor turned off and the unit unplugged to prevent accidental starting and injury. Exercise extreme caution in hand placement when removing a stuck core, as it can be heavy and inflict injury. CAUTION ! CAUTION ! (( )) on Deep Drilling When drilling holes that are longer than the core bit, follow the steps below. 1. Begin drilling the hole as usual. When you have drilled to the length of the bit, retract the bit from the hole and turn off the motor and water as usual. 2. Break off the core by driving a chisel or slender wedge into the circular kerf. Remove the core using core tongs, bent music wire or anchor bolts. 3. After removing the core, insert the bit carefully into the hole, attach a bit extension to the bit and core drill rig, then conti...

Other models in this manual:
Power Screwdrivers and Drills - MK-Manta I (1.29 mb)
Power Screwdrivers and Drills - MK-Manta I (1.29 mb)
Power Screwdrivers and Drills - MK-Manta I (1.29 mb)


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