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Substrate Technology Machines

Floor Machines


Ideal Grinder For Polishing Projects Up To 1000 SF (93 m2)
Power 7.5 HP (5.6 kW)
Power Supply 220-240V Single Phase, 40A
Weight 450 lbs (204 kg) - Including Pocket Weights
Tools 2 Tool Plates Included | Uses 6 Tools
Working Width 23 in. (58 cm)
  • The Prep/Master® Jr. grinder by STI works extremely well in small, hard-to-reach areas that requires a more compact design — perfect for residential garage floors. This grinder is very aggressive, yet extremely easy to operate due to the smooth operation of the STI rotary gear system. In addition, the low price of the Prep/Master Jr. is very affordable and fits any project budget

  • An ideal choice for project sizes up to 10,000 SF (1,000 m2). Despite its heavy weight and size, this grinder is extremely easy to operate due to the smooth operation of the STI rotary gear system. Its 30HP motor is built to last and its variable speed drive easily adapts to different grinding or polishing conditions for concrete, terrazzo, marble, and stone applications

  • The moveable pocket weight system adjusts head pressure depending upon application and the standard water tank makes it easy to switch from dry to wet work. The 3030 is available in 230V and 480V. Uses four tool plates (included) and twelve tools

  • Heavy head pressure for better performance

  • Easy disassembly of machine into two sections for quick transportation (grinding head weight=260 lbs. & handle weight=130 lbs

  • Screw-in carrying poles for two- or three-person lifting

  • Magnetic LED light that attaches anywhere to illuminate front or behind machine on the cutting path

  • On-board USB Charger & Phone Carrier

  • Uses Longopac bag for safe collection of toxic waste and dust