Sharpening The Cutter Blades; Maintenance And Inspection - Hitachi F-30A Handling Instructions Manual

English
block is correctly fitted to the hole on the rear plate,
push the back of the cutter blade with a fingertip
in the direction indicated by the arrow, until the
edge of the back metal is properly fitted to the
cutter block surface. Correct installation is illus-
trated in Fig.12.
(2) Place the blade holder on the completed assembly,
as shown in Fig.14, and fasten it with the three
bolts. Ensure that the bolts are securely tightened.
(3) Turn the cutter block over, and set the other side
in the same manner.
3. Adjustment of cutter blade height:
CAUTION
As the set gauge has been accurately factory
adjusted, never attempt to loosen it.
(1) After attaching the back metal to the cutter blade,
temporarily fasten them together with machine
screws, as shown in Fig.15.
(2) Insert the set gauge plate spring into the hole on
the back metal and heavily push the plate spring
in the direction indicated by the arrow in Fig.16 until
it snaps into the correct position.
(3) Holding the set gauge with the blade edge facing
downward as shown in Fig.17, loosen the tempo-
rarily fastened machine screws and lightly push the
cutter blade with a thumb until the cutter blade
gently touches Plate.
CAUTION
Do not push the blade with exessive pressure. Ex-
cessive pressure could cause maladjustment of the
blade height.
(4) Finally, retighten the machine screws to securely
fasten the cutter blade and the back metal, thereby
completing the blade height adjustment procedure.
(5) Holding the set gauge as shown in Fig.18, push
upward on the back metal and remove it from the
set gauge.
(6) The cutter blade is now ready to be mounted on
the planer as described in the section on cutter
blade assembly.

SHARPENING THE CUTTER BLADES

Use of the optional accessory Blade Sharpening Ass'y is
recommended for convenience.
(1) Use of Blade Sharpening Ass'y.
As shown in Fig.19, two blades can be mounted
on the blade sharpening ass'y to ensure that the
blade tips are ground at equal angles. During
grinding, adjust the position of the cutter blades so
that their edges simultaneously contact the grinding
stone as shown in Fig.20.
(2) Cutter blade sharpening intervals:
Cutter blade sharpening intervals depend on the
type of wood being machined and the cutting depth.
However, sharpening should generally be effected
after each 500 meters of cutting operation.
(3) Grinding allowance of the cutter blades:
As illustrated in Fig.21, a grinding allowance of 3.5
mm is provided for on the cutter blade. That is,
the cutter blade can be repeatedly sharpened until
its total height is reduced to 27 mm.
(4) Grinding Stone
When a water grinding stone is available, use it
after dipping it sufficiently in water since such a
19
grinding stone may be worn during grinding pro-
cedures, flatten the upper surface of the grinding
stone as frequently as possible.

MAINTENANCE AND INSPECTION

1. Inspecting the cutter blades:
Continued use of dull or damaged cutter blades will
result in reduced cutting efficiency and may cause
overloading of the motor. Sharpen or replace the
cutter blades as often as necessary.
2. Handling:
CAUTION
The front base, rear base, and cutting depth control
knob are precisely machined to obtain specifically
high precision. If these parts are roughly handled
or subjected to heavy mechanical impact, it may
cause deteriorated precision and reduced cutting
performance. These parts must be handled with
particular care.
3. Inspecting the mounting screws:
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Fail-
ure to do so could result in serious hazard.
4. Inspecting the carbon brushes: (Fig.22)
The motor employs carbon brushes which are con-
sumable parts. Since an excessively worn carbon
brush could result in motor trouble, replace a carbon
brush with a new one when it becomes worn to
or near the "wear limit". In addition, always keep
carbon brushes clean and ensure that they slide
freely within the brush holders.
5. Replacing a carbon brush:
After removing the tail cover, use a minushead
screwdriver to disassemble the brush cap. The
carbon brush can then be easily removed with the
spring.
6. Maintenance of the motor:
The motor unit winding is the very "heart" of the
power tool. Exercise due care to ensure the winding
does not become damaged and/or wet with oil or
water.
NOTE:
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning airborne noise and vibration
The measured values were determined according to
EN50144.
The typical A-weighted sound pressure level: 90 dB (A).
The typical A-weighted sound power level: 103 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration value
does not exceed 2.5 m/s
2
.