Description
Violent kickback from heavy rotary hammers tears shoulder muscles when two-inch core bits snag reinforcement steel. The Makita 11 AMP 1-9/16 in. SDS-MAX AVT Rotary Hammer Drill absorbs heavy recoil while punching structural holes through foundation walls. An 11-ampere motor generates 8.4 foot-pounds of impact energy at 2900 blows per minute. Coring dry masonry without clearing concrete powder will burn bit carbide.
Die-cast magnesium gear housings enclose an electro-pneumatic hammer piston running inside synthetic fluid grease. Anti-Vibration Technology utilizes an active three-component counter-balance system that shifts opposite the reciprocating piston while air dampers cushion spring-loaded handles. The motor wet-end features heavy copper commutator bars and epoxy-potted armature coils that shed thermal build under continuous drilling resistance. Mechanical torque-limiting clutches decouple gear teeth when large drill bits jam inside structural rebar cages.
Rotary Hammer Hardware Specs
Internal mechanical counterbalances cancel striker vibration before it reaches operator hand grips. An active three-component vibration absorption system cuts fatigue during all-day demolition chipping.
- 1.562-inch solid bit capacity cuts heavy structural anchor holes in cured industrial concrete
- 8.4 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
- Anti-Vibration Technology counterbalances cancel reciprocating shock inside the tool chassis
- Mechanical torque limiters decouple drive gears during sudden bit bind-up to protect operator wrists
- Two-mode selector lever shifts between hammer drilling and hammer-only chiseling operations
- SDS-max drive chuck locks large core bits and demolition chisels securely without slip
Hammer Bench Load Telemetry
Bench testing monitors electrical current draw and impact energy during concrete penetration. Unloaded motor rotation draws 3.6 amperes at 120 volts, surging to 12.8 amperes while drilling 1-1/2-inch holes in high-strength concrete. Spindle rotation drops from 500 RPM free speed down to 420 RPM under heavy downforce. Striker frequency stabilizes at 2900 BPM under load. Decibel sound level meters read 94 dBA at operator ear level. Front gearcase exterior temperatures climb 26 degrees Fahrenheit after fifteen deep holes.
Field Service Operational Traps
Neglecting bit shank grease causes high-friction galling that seizes expensive SDS-max bits inside the chuck. Finish carpenters hanging drywall trim have no need for this heavy concrete hammer. Never operate this machine in chisel mode with the rotation lock lever disengaged.
- Grease bit shanks with high-temperature chisel paste before inserting into the chuck.
- Wipe concrete dust off the rubber chuck nose cone after every shift.
- Clean power cord insulation jackets using solvent wipes to inspect for wire cuts.
Commercial Warranty Package Inventory
Makita covers this corded rotary hammer with a 1-Year commercial warranty against defects. The package contains the 1-9/16-inch SDS-max rotary hammer, auxiliary side handle, depth stop rod, bit grease tube, and rugged carrying case.
