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SFG10E ELECTRIC SURFACE GRINDER — OPERATION AND PARTS MANUAL — REV. #1 (07/16/07) — PAGE 28
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.
CAUTION
CAUTIONCAUTION
CAUTIONCAUTION
CAUTION
DANGERDANGER
DANGERDANGER
DANGER
EXERCISE EXTREME CAUTION WHEN UTILIZING
ANY SOLVENT TO REMOVE ACCUMULATED MATE-
RIALS FROM THE SURFACES OF THE 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.
DANGERDANGER
DANGERDANGER
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.
STOPPING THE 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,