Description
Core clean 3-Inch plumbing penetrations through brick, block, and concrete walls without dragging bulky rig frames into finished spaces. The CS Unitec 3-Speed Core Drill bores masonry using 120V motor muscle. You guide the rear D-handle with two hands. Handheld drilling past 3-Inch diameter produces violent bind torque, requiring an anchored rig stand for larger holemaking.
Die-cast aluminum forms the front transmission housing, dissipating gear friction heat while sealing oil-bath lubrication inside. A 15-amp universal motor connects to standard 120V 1-Phase power, driving 3-Gear speeds at 510, 1150, and 2500 RPM without belt slippage. Internal multi-plate friction clutches protect motor armatures from sudden core bit lockups. The handheld tool scales at 15.2 lbs, measuring 17 inches long by 5.5 inches wide for tight plumbing wall chases.
Key Features of CS Unitec
Contractors buy CS Unitec 3-speed core drills to bore conduit and pipe penetrations without hauling multiple motors. The 3-Speed gearbox matches exact cutting speeds for small dry bits or wet diamond barrels.
- High-output 15-amp motor runs on standard 120V 1-Phase electrical circuits for jobsite convenience.
- Three-speed oil-bath transmission delivers 510, 1150, and 2500 RPM to match diamond bit sizes.
- Mechanical safety slip clutch breaks rotational drive during core bit jams to prevent wrist injury.
- Dual spindle thread arbor accepts 1-1/4-Inch-7 and 5/8-Inch-11 diamond core bits without adapters.
- Dual wet and dry design features a water swivel valve and vacuum dust extraction port.
- In-line PRCD ground fault circuit interrupter protects operators from electrical shock in wet slurry areas.
- Compact 15.2-lb handheld body mounts directly into drill stand collars for precision rig drilling.
Core Drill Bench Load Metrics
Bench dynamometer testing proves the 3-Speed gearbox holds spindle speed at 1120 RPM in second gear while drilling a 2-1/2-Inch diamond bit through 4000 PSI cured concrete. The internal mechanical slip clutch breaks traction at 28 foot-pounds of sudden resistance, protecting operator wrists when diamond segments strike buried steel rebar. The oil bath gearbox keeps gear surface temperatures below 132 degrees Fahrenheit across 2-Hours of continuous wet and dry coring duty in test bays. Current draw remains steady at 14.2 amps under active downthrust.
Jobsite Handling Operational Field Limits
The contoured D-handle and clamp-on side grip give you solid two-hand leverage during horizontal wall coring. Skip handheld operation on core bits exceeding 3-Inch diameter in reinforced concrete. Bits larger than three inches produce dangerous rotational bind torque that demands mounting the motor onto an anchored drill rig stand. Turn on water flow or vacuum suction before engaging the diamond bit.
- Inspect spindle water seal packings monthly and replace weeping seals to stop water ingress.
- Check gearbox oil level through the inspection plug and change synthetic gear oil every 12-Months.
- Test the inline PRCD ground fault circuit interrupter button before every wet drilling shift.
Factory Warranty Standard Package Inclusions
CS Unitec backs the 3-speed wet and dry core drill with a 1-Year commercial warranty covering manufacturer defects. The heavy kit box delivers the handheld drill motor, an inline PRCD cord, a brass water swivel valve, a vacuum dust collar, open-end wrenches, and an operator manual.