Stow manual Stoppingthe SFG10E Surface Grinder, Early Age Grinding

CAUTION

Failure to properly clean the interior surfaces of the SURFACE GRINDER can result in dried material build-up and accumulation directly affecting bearing service life.

DANGER

EXERCISE EXTREME CAUTION WHEN UTILIZING ANY SOLVENTTO REMOVE ACCUMULATED MATE- RIALS FROMTHE SURFACES OFTHE MACHINE AND RELATED COMPONENTS. MANY SOLVENTS ARE FLAMMABLE. DO NOT SMOKE OR INTRODUCE FLAME IN THE WORK AREA. PROVIDE ADEQUATE VENTILATION AND WEAR PROPER SAFETY AP- PAREL.

DANGER

PROPERLY DISPOSE OF ALL ACCUMULATED MA- TERIALS PER OSHA AND ENVIRONMENTAL PROTECTION AGENCY CODES AND REGULATIONS. MANY ACCUMULATED MATERIALS CAN BE CLAS- SIFIED AS HAZARDOUS AND REQUIRE PROPER DISPOSAL PROCEDURES. CONTACT THE APPLI- CABLE GOVERNMENT AND/OR PRIVATE AGENCIES FOR SPECIFIC INFORMATION.

8)On job applications where the work process creates a considerable amount of loose material, it can become almost impossible to determine proper material removal depths and the extent of work already accomplished. The problem can be compounded if a vacuum system is not utilized. Loose material should be removed by sweeping or other, appropriate processes and the SURFACE GRINDER utilized until conditions again warrant removing the accumulated material.

STOPPINGTHE SFG10E SURFACE GRINDER

1)Stopping the SURFACE GRINDER is accomplished by moving the ON/OFF switch located on the operator handle to the OFF position. For safety considerations, it is also recommended that the extension cord be disconnected from both the SURFACE GRINDER and electric power source whenever the SURFACE GRINDER is not in use on the jobsite

OPERATIONAL PARAMETERS AND TECHNIQUES FOR THE SFG10E SURFACE GRINDER

Early Age Grinding

Early age grinding is an alternative to floating and trowelling. It gets it name from the fact that the concrete is ground at an early age, after it has set but before it has gained much structural strength. The process usually involves the following steps:

1)Normal screeding of the floor.

2)Smoothing the floor surface with a skip float.

3)Cover the floor with polyethane sheeting.

4)Removing the sheeting and grinding the floor down a uniform depth of approximately 1/32 inch within 24 to 48 hours of the initial pouring.

The C06 and C10 silicon carbide grinding stones are usually used for the process, although the multi segmented, dry diamond blades can be use as an alternative with substantially greater productivity rates.The main benefit of early age grinding is that it eliminates late work in cold weather.With ordinary finishing methods, a slab cast in the morning of a cold weather day might not get finished trowelled until very late at night. With grinding, the construction crew are able to leave the job at the end of a normal work day and return 1 or 2 days later to finish the job. Early age grinding may not reduce the total number of work hours, but it usually eliminates the need for work at overtime rates, which can substantially increase total project costs.

One side benefit of early age grinding is that the process demands less skill than conventional floating and trowelling. This makes it an attractive process where skilled crew personnel may not be available. It is also an excellent procedure for concrete floors that will be eventually covered by carpet or an applied coating.

Definitions of floor flatness and levelness

The terms flatness and levelness have poorly understood meanings in everyday speech, but have important distinctions in floor construction.

Flatness is defined as planarity or lack of curvature. A more simple definition is that a flat floor is smooth and free of bumps and dips. An unflat floor is bumpy and wavy. Levelness is defined as horizontality or lack of slope. A level floor is horizontal. A floor that is unlevel is sloped or tilted.

A floor can be flat, but still not level. Some floors are specifically designed to be unlevel; they can be intentionally sloped for drainage considerations. Very few, if any, floors are specifically designed to be unflat. Unfortunately, many turn out that way. Flatness and levelness are both desirable,

SFG10E ELECTRIC SURFACE GRINDER — OPERATION AND PARTS MANUAL — REV. #1 (07/16/07) — PAGE 28