Description
Lightweight core drill stands shudder and flex when sinking eight-inch diamond bits through heavily reinforced floor slabs. The CS Unitec Rig-Mounted 120V 8 Inch wet core drill anchors solidly to drill eight-inch penetrations through cured concrete. A 19.5-ampere motor drives mechanical gear reduction at 450 or 1050 RPM. Running diamond core barrels dry without water flow melts matrix segments.
Precision-machined aluminum gear cases protect a two-speed oil-bath transmission running on ground alloy steel shafts supported by tapered roller bearings. The electric motor wet-end features dual-insulated copper field windings and thermal overload switches that protect the armature from burning out during core bit stalls. An internal mechanical slip clutch decouples the drive train if rebar jams the diamond barrel. Stainless steel water feed spindles inject coolant directly through the core bit center.
Rig Mounted Core Drill Specs
Two-speed oil-bath gearboxes optimize peripheral cutting speeds across small and large core diameters. Rigid anchor stand columns prevent carriage deflection during deep concrete coring passes.
- 8-inch core bit capacity drills mechanical penetrations through reinforced concrete slabs
- 19.5-ampere 120-volt motor delivers sustained drilling torque through hard river rock aggregate
- Two-speed oil-bath gearbox selects 450 RPM or 1050 RPM to match diamond bit diameters
- Heavy-duty anchor stand column prevents carriage deflection during deep foundation coring runs
- Integrated water swivel injects cooling water through the spindle center to flush concrete slurry
- Mechanical slip clutch protects internal gears from shock damage during rebar contact
- Built-in ground fault circuit interrupter prevents electrical shock hazards in wet slurry environments
Dynamometer Core Bench Telemetry
Bench testing quantifies electrical current draw and spindle torque across cured 5000 PSI reinforced concrete. The motor pulls 3.8 amperes unloaded, rising to 18.6 amperes while spinning an eight-inch diamond core bit through concrete and rebar. Spindle speed drops from 450 RPM down to 385 RPM under firm carriage downforce. Output torque stabilizes at 64 foot-pounds during continuous coring passes. Sound level meters read 87 dBA at operator ear level. Gearbox oil temperatures rise 28 degrees Fahrenheit after two deep slab cores.
Field Service Operational Traps
Loose anchor bolts allow the mast base to shift, binding the diamond core barrel and stripping drive gears. Plumbers installing residential copper pipe have no use for this stationary anchor rig. Never operate this core drill without connecting a pressurized water feed line.
- Flush the internal water swivel with clean water after finishing concrete coring jobs.
- Check gearcase oil levels through the sight glass before starting weekly drilling shifts.
- Wipe abrasive concrete slurry off the anchor stand column tracks after every shift.
Commercial Warranty Package Inventory
CS Unitec protects this wet core drill with a 1-Year commercial warranty against defects. The package contains the DBE-201 core drill motor, anchor stand column, base plate, water hose connection, wrenches, and operator manual.