Description
Fabrication pipe yards demand continuous high-velocity cutting without dragging tangled extension cords across muddy ground. The Makita 40V max XGT Cordless 4-1/2 in / 6 in Grinder generates 9000 RPM wheel speed. Forcing large 6-inch wheels through thick-wall steel pipe causes rotational slip, triggering electronic feedback sensors that shut down power before gear teeth strip.
Makita constructs this tool with an alloy steel gearset inside an aluminum gear housing, backed by sealed ball bearings to eliminate spindle runout. A high-output brushless motor integrates Active Feedback-sensing Technology, which detects sudden wheel speed drops and halts motor rotation within 0.1 second. The mechanical gear train couples to an electric brake that stops spinning accessories in under 2 seconds upon paddle release.
High Output XGT Grinder Matrix
40V max battery electronics maintain high wheel surface velocity through deep structural cuts. Active feedback sensors protect operators by cutting power the instant abrasive wheels bind inside narrow cuts.
- 40V max brushless motor delivers power output matching 15 amp corded demolition grinders.
- 9000 RPM base spindle speed sustains aggressive wheel surface feet per minute in 6-inch discs.
- Active Feedback-sensing Technology shuts down motor power within 0.1 second of sudden stall.
- Electric brake mechanism halts spinning 6-inch cutting discs in under 2 seconds flat.
- 5/8-11 spindle arbor accepts standard 4-1/2-inch, 5-inch, and 6-inch grinding wheels.
- Non-locking paddle switch ensures direct operator hand control during difficult pipe beveling angles.
- Auto-Start Wireless System hardware connects tool activation to compatible dust extractor vacuums.
Cordless Bench Load Dynamometer Telemetry
On the load bench, the 40V max motor pulls 42 amps continuous from the 4.0 Ah battery pack under feed pressure. Spindle rotation drops from 9000 RPM down to 7800 RPM under 24 inch-pounds of applied drag. Nose cone temperature rises 42 degrees Fahrenheit after continuous bevel passes on 4-inch Schedule 40 pipe. Sound pressure measures 83 dBA idle and peaks at 95 dBA under heavy metal removal.
Pipe Yard Safety Limits Service Mandates
Using 6-inch wheels increases gyroscopic reaction torque during sudden tool repositioning across pipe joints. Do not issue this grinder to personnel operating with cracked or water-soaked abrasive discs, which fragment under 9000 RPM centrifugal stresses. Dropping the tool head onto steel pipes cracks the aluminum gearcase nose.
- Blow abrasive metal particles from intake vents using dry shop air every shift.
- Inspect the inner wheel flange and lock nut for surface wear before mounting wheels.
- Check battery slide rails for grit accumulation and wipe clean every work week.
Makita Factory Warranty Package Contents
Makita warrants this XGT cordless tool and charger with a 3-Year limited warranty against defective workmanship. The heavy contractor tool bag includes the GAG14 grinder, one 40V max XGT 4.0 Ah battery pack, one rapid charger, 4-1/2-inch guard, 6-inch guard, vibration-absorbing side handle, and lock nut wrench.
