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Hitachi P20SB Manual

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English
CUTTER BLADE ASSEMBLY AND
DISASSEMBLY AND ADJUSTMENT OF
CUTTER BLADE HEIGHT
1. Cutter blade disassembly:
(1) As shown in Fig. 4, use the accessory box wrench
to withdraw the three bolts used to retain the cutter
blade, and remove the cutter blade holder.
(2) As shown in Fig. 5, slide the rear side of the cutter
blade in the direction indicated by the arrow to
disassemble the cutter blade.
CAUTIONS
⅜ Be careful not to injure your hands.
⅜ It is not necessary to disassemble the back metal
from the cutter blade. (See Fig. 6)
⅜ Disassembling the back metal from the cutter
blade is to be made only at grinding the cutter
blade.
2. Cutter blade assembly:
CAUTIONS
⅜ Prior to assembly, thoroughly wipe off all swarf
accumulated on the cutter blade.
(1) Turn the flat surface of the cutter block sideways,
and assemble the adjusted cutter blade as shown
in Fig. 7. Ensuring that the leaf spring on the cutter
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 illustrated
in Fig. 8.
(2) Place the blade holder on the completed assembly,
as shown in Fig. 10, 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
⅜ 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. 11
(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. 12
until it snaps into the correct position.
(3) Holding the set gauge with the blade edge facing
downward as shown in Fig. 13, loosen the
temporarily fastened machine screws and lightly
push the cutter blade with a thumb until the cutter
blade gently touches the plate.
CAUTION
⅜ Do not push the blade with excessive pressure.
Excessive pressure could cause maladjustment
of the blade height.
(4) Finally, retighten the machine screw 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. 14, 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. 15, 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. 16.
(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. 17, 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 24.5 mm.
(4) Grinding Stone
When a water grinding stone is available, use it
after dipping it sufficiently in water since such a
grinding stone may be worn during grinding
procedure, 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
⅜ 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. Failure
to do so could result in serious hazard.
4. Inspecting the carbon brushes: (Fig. 18)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones having the same carbon
brush No. shown in the figure 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 carbon brushes:
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
01Eng_P20SB_WE_8L 08/12/19, 21:268
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