Description
Dull drill bits wander off target marks and gall expensive workpiece metals during production machining operations. The Darex 115 Volt Drill Bit Sharpener restores factory drill point geometry with an industrial motor spinning at 2850 RPM. This compact toolroom sharpener requires clean drill shanks for true chuck clamping and cannot grind bits larger than 3/4-inch diameter.
A precision-machined cast aluminum housing supports the direct-drive motor assembly, dampening high-speed harmonics during grinding cycles. The motor arbor couples to an electroplated CBN grinding wheel that profiles high-speed steel, cobalt, and parabolic drill points without drawing edge temper. An industrial alignment chuck features hardened steel jaws and integrated split-point cams to grind self-centering 118-degree to 140-degree points in a continuous rotational motion.
Toolroom Drill Grinder Specifications
Precision alignment ports establish exact drill overhang and point angle geometry from 118 degrees to 140 degrees. The integrated split-point station creates self-centering points to eliminate pilot hole drilling.
- 115-volt industrial motor spins electroplated CBN grinding wheels at 2850 RPM without thermal bog
- Sharpening capacity handles high-speed steel, cobalt, and carbide drill bits from 1/8 to 3/4-inch
- Adjustable point angle port sets drill point bevels between 118 degrees and 140 degrees accurately
- Built-in split-point grinding port creates clean self-centering points on heavy-duty drills
- Electroplated CBN grinding wheel cuts tool steel cool without drawing edge hardness temper
- Precision steel chuck holds drill shanks firmly to eliminate angular runout during sharpening
- Die-cast aluminum chassis provides structural rigidity while isolating motor vibration
Dyno Bench Arbor Telemetry
Bench testing on a 115-volt 15-amp line records 2.8 amperes continuous current draw during 5/8-inch cobalt drill split-point grinding. Motor arbor velocity maintains 2840 RPM from a 2855 RPM free-spin baseline under firm chuck rotation. Arbor shaft runout measures less than 0.0004 inches total indicator reading. Motor housing temperature rises 21 degrees Fahrenheit after two hours of continuous toolroom operation. Sound output measures a modest 68 dBA at operator position.
Field Care Rules Tool Limitations
This precision drill sharpener requires clean drill shanks and calibrated chuck jaws to maintain true point symmetry across machine drills. Maintenance mechanics must not grind soft steel, brass, or masonry bits on the CBN wheel because soft swarf glazes the abrasive matrix. Avoid rotating the chuck assembly forcefully against the grinding stop to prevent wheel face damage.
- Blow fine metallic grinding dust from chuck alignment ports using dry compressed shop air daily.
- Wipe precision chuck split-point cams with clean rags and apply light spindle oil monthly.
- Inspect electroplated CBN grinding wheel for abrasive wear and replace when spark patterns diminish.
- Check drill bit alignment port stop pins for burrs and clean with fine abrasive pads.
- Store precision drill chuck collets inside dedicated cases to protect jaw ground faces.
Commercial Warranty Tool Manifest
Darex backs the V390 drill bit sharpener with a 1-Year limited warranty against mechanical and electrical defects. The package contains the V390 sharpener chassis, precision chuck for 1/8 to 3/4-inch drills, CBN grinding wheel, point angle gauge, hex adjustment keys, and operations manual.