Description
A low-speed 140 RPM gear transmission delivering 150 lbs down-pressure grinds stone flat without motor bogging. The Mastercraft Quarrymaster 17″ Rotary Floor Machine scours natural marble, granite, and quarry tile across a 17-inch path on 115V power. You hone stone with precision. However, this heavy 140 RPM machine cannot achieve high-gloss thermal burnishing on floor wax.
Mastercraft fabricates this stone restoration machine with a reinforced cast aluminum apron base and a welded chrome-plated steel handle column. A high-torque 1.5 HP dual-capacitor motor powers an all-steel triple-planetary gearbox at 140 RPM. Removable horseshoe ballast weights bring total downward contact force to 150 lbs. Large five-inch non-marking transport wheels carry the 155-pound operating weight without marking finished floors.
Key Features of Mastercraft Quarrymaster
Deploy this low-speed weighted rotary machine to grind terrazzo, hone marble tiles, and scrub grease from restaurant quarry tiles. Direct pricing ensures stone care contractors receive industrial torque for demanding diamond crystallization.
- A 1.5 HP dual-capacitor motor provides continuous 140 RPM low-speed stone grinding torque.
- All-steel triple-planetary gears absorb high friction shocks during stone crystallization.
- Removable cast iron horseshoe weights supply up to 150 lbs head down-pressure.
- A 17-inch cast aluminum apron withstands aggressive diamond slurry exposure.
- A 50-foot safety power cord delivers wide working range from standard wall outlets.
- Dual deadman safety switches eliminate accidental motor activation during transport.
- Non-marking transport wheels roll over door thresholds without scuffing polished stone.
Dynamometer Bench Testing Load Telemetry
Dynamometer bench testing demonstrates continuous motor current draw of 14.1-Amps at 115V under full 150 lbs ballast load on rough granite slabs. The low-speed gearbox holds output spindle rotation steady at 138 RPM without belt slip or gear tooth chatter. Sound profile meters register a moderate 64 dBA acoustic signature at operator standing height. Motor stator thermals rise 31°F after three continuous hours of full dynamometer load, verifying adequate internal fan cooling under extreme friction.
Field Operation Usability Maintenance Directives
Custodians guide this weighted machine using subtle handle height changes to control lateral drift across stone slabs. Remove the drop-on horseshoe weights before tilting the machine back for diamond pad driver swaps. Do not use this 140 RPM rotary machine for high-speed dry burnishing or uncontained dry drywall sanding.
- Rinse abrasive stone grinding slurry off the aluminum deck apron after each shift.
- Inspect the planetary gearbox lubricant level every 500 operating hours.
- Check the 50-foot power cable outer jacket every seven days for copper exposure.
Commercial Warranty Terms Crate Manifest
Mastercraft backs this machine with a 5-Year motor warranty and a 1-Year commercial parts warranty. The shipping crate delivers the complete Quarrymaster 17-inch machine base, two removable 25-pound horseshoe weights, a 50-foot safety power cord, pad driver, and official manufacturer operating instruction manuals.