Ideal for Polishing Projects up to 1,000 SF (100 M2)
Our customers' favorite little grinder! The Prep/Master® Jr.
floor grinding machine by STI works extremely well in small, hard-to-reach
areas that requires a more compact design — perfect for residential garage floors
and basements.
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.
- Working width: 23 in. (58cm)
- 7.5 HP (5.6kW)
- 220-240V Single Phase, 40A
- 450 lbs. (204 kg) including pocket weights
- 2 tool plates (included)
- Uses 6 tools
Special Features
Heavy head pressure for a better grind and polish — 60% of
its weight is on the head!
Magnetic LED Light to illuminate front of machine or behind
machine on the cutting path
Easy disassembly of machine into two sections for easier
transportation
(Grinding head = 260 lbs. / Handle = 130 lbs. / Two Pocket
Weights = 30 lbs. each)
Screw-in Carrying Poles for two-three person lifting
8-gallon (30 liters) water tank
On-board USB Charger & Phone Carrier
Machine Specs -
Electric
Coverage: Up to 1,000 SF (100 m2)
Power Source: 220-240V Single Phase, 40A
Motor: 7.5 HP, Variable Speed Drive (5.6kW)
Dimensions: 50 L x 23 W x 48 H in. (127 x 58 x 122 cm)
Working Width: 23 in. (58cm)
Weight: 450 lbs. (204 kg) including pocket weights
Tools RPM: 250-500 RPM Variable
Tools Attachment Style: EG Proprietary Attachment System
Vacuum Hose Connection: 2 in. (50 mm) sold separately
Recommended Vacuum: PM3003AR
Production Rates
Mastic Removal: 200 SF (20 m2) per hour
Thin Set Removal: 200 SF (20 m2) per hour
+/-25 Mil Coatings: 200 SF (20 m2) per hour
Concrete Polishing: 300 SF (30 m2) per hour
Spec Sheet