Makita JN3200, Instruction Manual

Page: 5 / 36

5
ASSEMBLY
CAUTION:
•
Always be sure that the tool is switched off and
unplugged before carrying out any work on the
tool.
Punch replacement
Fig.3
Fit the wrench provided onto the lock nut and tap the
handle lightly with a hammer to loosen the lock nut. Take
off the die holder and use a wrench to remove the screw.
Then remove the punch.
To install the punch, insert it into the punch holder with its
cutting edge facing forward so that the pin in the punch
holder fits into the groove in the punch. Install the screw
and lock nut. Then tighten them securely.
Fig.4
NOTE:
•
When installing the screw and lock nut, be sure to
tighten securely. If they become loose during
operation, the tool may break down.
Fig.5
OPERATION
Pre-lubrication
Coat the cutting line with machine oil to increase the
punch and die service life. This is particularly important
when cutting aluminum.
Cutting method
Fig.6
Smooth cutting is achieved by holding the tool upright
and applying gentle pressure in the cutting direction.
Apply tool oil to the punch about every 10 meters of mild
steel or stainless steel to be cut. Light oil or kerosene
should be used to keep an aluminum lubricated
continuously. Failure to lubricate aluminum in the cut will
cause chips to adhere to the tool, dulling the die and
punch and increasing load on the motor.
Cutouts
Fig.7
Cutouts can be done by first opening a round hole of
about 42 mm diameter or more in the material.
Cutting stainless steel
Fig.8
There is more vibration when cutting stainless steel than
mild steel. Less vibration and better cutting is possible by
adding another washer (standard equipment) beneath
the die.
Use the hex wrench provided to remove the two screws
and insert the washer below the die. Replace screws and
tighten securely.
MAINTENANCE
CAUTION:
•
Always be sure that the tool is switched off and
unplugged before attempting to perform inspection
or maintenance.
•
Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may
result.
Punch & die service life
Replace or sharpen punch and die after cutting the
lengths indicated in the accompanying table. Their life, of
course, depends upon the thickness of materials cut and
lubrication conditions.
P un c h R e pl a c e a f ter 15 0 m of 3 . 2 mm s tee l s heet
Di e S har p en a f ter 300 m of 3 . 2 mm s tee l s heet
006441
When cutting is poor even after replacing the punch,
sharpen the die. Grind down the dull edge shown in the
figure using a grinder. After rough-grinding the dull
portion, finish with a dressing stone. Stock removal
should be about 0.3 to 0.4 mm.
Fig.9
When installing ground die, a clearance of 3.5 to 4.0 mm
should be obtained by attaching one or two of the
washer provided, as shown in the figure. Failure to have
the proper clearance will result in vibration during
cutting.
Fig.10
CAUTION:
•
Secure installing screws carefully when installing. A
loose screw can cause tool breakage during
operation.
NOTE:
•
The die can be sharpened two times. After two
sharpenings, it should be replaced with new one.
Replacing carbon brushes
Fig.11
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder caps. Take
out the worn carbon brushes, insert the new ones and
secure the brush holder caps.
Fig.12
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
performed by Makita Authorized Service Centers, always
using Makita replacement parts.