20. FAILURES THAT MIGHT OCCUR DURING MACHINE WORKING CYCLE
20.1 DRILLS LEAVING SCORCH MARKS
This problem might occur whenever the piece is not set at a 90° angle or whenever drills are worn.
Drills might also be turning in the opposite direction.
20.2 BORED PIECES ARE NOT SET AT A 90° ANGLE TO TABLE
This problem might be due to the fact that the drills have not been set at a 90° angle to the table. Check
angle of table limiters to rack as well as parallelism of drills line to table.
20.3 HEAD CANNOT ROTATE PROPERLY
If boring unit finds it difficult to reach other positions or cannot reach other positions altogether, check
hinge and shaft of overturning pneumatic piston.
20.4 HOLD DOWN CLAMPS CANNOT CLAMP WOOD PIECE
If hold down clamps cannot clamp pieces, check air pressure and connection tubes.
To solve these problems, we suggest that you contact GRIGGIO S.p.A. Post-sale Assistance Service or
your local dealer.
21. A. NOISE LEVEL
Assuming the machine is functioning properly and that tool balancing and sharpness are correct, noise
emissions can vary according to the material being worked, to drills diameter and to boring depth.
Length of time operators are expected to stay close to the machine can vary over the 8-hour working
day.
Other factors play a role in determining the exposition level, such as surrounding environment and other
sources of noise as well as the presence of other machines nearby. We advise you to inform operators
about risks resulting from a long exposition to noise and, if necessary, provide them with suitable individ-
ual protection devices.
The acoustic pressure level detected with a class-1 integrating noise meter at operator’s working posi-
tion is 76.1dB (A).
This measurement has been carried out in compliance with ISO 3745 standard. During the measure-
ment, the machine was functioning at steady state as far as pressure and speed were concerned, and
was drilling a wooden shaving panel with PVC covering.
The measurement has been carried out at a 1.5-m height in front of the machine at the operator’s work-
ing location.
The following reference measurements have been obtained by following the same procedure:
Acoustic pressure level in Atm.
dB(A):78.3
Acoustic power level
dB(A):93.3
21. B. DUST EMISSIONS
These are the results of a test carried out to determine the level of dust emissions during a non-stop
one-hour working span, while a 22 mm-thick fir panel with a PVC covering was being drilled.
Dust emission amounted to 13.9 mg/N cu.m at operator’s working location, which is at a 1.5-m height in
front of the machine.
23
GRIGGIO S.p.A.
WOODWORKING MACHINERY
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