Description
Worn splines strip out of standard hammer chucks, causing expensive drill bits to slip and bind inside deep anchor holes. The Makita 1-9/16 in. Rotary Hammer Accepts Spline Bits delivers 6.9 foot-pounds of impact energy to drill structural concrete without bit slippage. An 11-ampere motor drives mechanical gear reduction at 480 RPM. Jamming large spline core bits into solid steel rebar will slip the mechanical clutch.
Die-cast aluminum gearcases protect dual-ratio spur and bevel gear sets running in synthetic extreme-pressure grease. The motor wet-end incorporates pure copper commutator bars and resin-bonded armature windings that shed thermal build during continuous heavy masonry penetrations. Precision ball and needle bearings support the spline drive spindle to resist severe axial thrust. Mechanical torque limiters decouple gear teeth when large core bits snag hidden framing rebar.
Spline Rotary Hammer Hardware Specs
Heavy spline drive chucks transfer rotational torque across six positive drive lugs without slippage under load. Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect operator wrists.
- 1.562-inch solid bit capacity cuts heavy structural anchor holes in cured industrial concrete
- 6.9 foot-pounds of impact energy pulverizes hard aggregate during heavy foundation drilling
- 11-ampere 120-volt motor delivers sustained hammer power under heavy operator hand feed
- Spline drive chuck provides positive torque transmission across six heavy steel drive splines
- Two-mode selector lever shifts between hammer drilling and hammer-only chiseling operations
- Vibration-absorbing rear handle isolates operator hands from continuous mechanical recoil
- Electronic speed control dial maintains preset rotation and impact speeds under changing loads
Spline Hammer Bench Load Telemetry
Bench testing monitors motor current draw and impact cadence through cured 5000 PSI concrete. Free motor rotation draws 3.6 amperes at 120 volts, surging to 11.8 amperes while driving a 1-1/2-inch spline bit through concrete and rebar. Spindle rotation drops from 480 RPM free speed down to 410 RPM under heavy feed downforce. Impact frequency hits 2750 BPM under load. Decibel sound level meters read 92 dBA at operator ear level. Gearcase exterior temperatures climb 26 degrees Fahrenheit after twelve deep holes.
Field Service Operational Traps
Inserting dry unlubricated spline bit shanks into the chuck wears drive splines and seizes tools. Drywall contractors hanging metal studs have no use for this heavy-duty rotary hammer. Never operate this machine in chisel mode with the rotation lock lever disengaged.
- Coat spline bit shanks with high-pressure chisel grease before inserting into chuck collars.
- Wipe abrasive concrete powder off the chuck nose seal sleeve after every work shift.
- Blow dry compressed air through motor intake grilles every forty hours of use.
Commercial Warranty Package Inventory
Makita protects this corded spline rotary hammer with a 1-Year commercial warranty against defects. The package contains the 1-9/16-inch spline rotary hammer, auxiliary side handle, depth stop rod, bit grease tube, and rugged carrying case.
