Maintenance And Service; Maintenance And Cleaning - Bosch GNA 3,5 PROFESSIONAL Bedienungsanleitung

OBJ_BUCH-101-001.book Page 4 Friday, March 31, 2006 10:33 AM
Switching On and Off
To start the machine, push the On/Off switch 5 for-
wards.
To lock the On/Off switch 5, additionally push down
the front of the switch.
To switch off the machine, release the On/Off switch
5. When the On/Off switch is locked, press on the rear
of the switch and then release it.
Operating Instructions
Apply the machine to the workpiece only when
switched on. Always hold the machine vertical to the
surface of the steel sheet and do not tilt it.
The cut takes place during the downward motion of the
punch. Guide the machine evenly and with moderate
feed in the cutting direction. A high feed rate signifi-
cantly reduces the service life of the cutting tools and
can damage the machine.
The machine operates more quietly when it is raised
slightly during cutting. If the punch should become
wedged during cutting, switch the machine off, relubri-
cate the punch and release the tension of the steel
sheet. Do not exert force, otherwise the punch and the
die will become damaged.
Wear protective gloves while working and pay
particular attention to the mains cable. Sharp
burrs develop at the cut steel sheet and can cause
injuries to the operator or damage the mains cable.
Maximum Steel Sheet Cutting Capacity
The maximum steel sheet cutting capacity d
depends on the strength properties of the material to
be cut.
The machine allows for straight and deformation-free
cutting of metal sheets to the following thicknesses:
Material Max. strength
property
[N/mm
Steel 400
600
800
Aluminium 200
3 609 929 A61 • 31.3.06
Lubricating/Cooling the Punch
To extend the service life of the punch 10, a lubricating
agent with good cooling properties (e.g. cutting oil)
should be used.
Apply a trail of lubricant beads onto the top side of the
metal sheet alongside the intended cutting line. For
long periods of continual use or for work with high fric-
tional wear (e.g. when cutting aluminium), the cutting
head should be immersed into a container with lubri-
cant in regular intervals.
Cutting along a Cutting Mark or with a Guide
The projection on the hold down guide 12 serves as a
cutting mark after having made the incipient crack.
Straight cuts are carried out easier when the machine
is guided alongside a rule.
For inside cuts, pre-drilling a hole with a diameter of
41 mm is necessary.

Maintenance and Service

Maintenance and Cleaning

Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep the
machine and ventilation slots clean.
Clean and lubricate the punch 10, die 14 and guide
plate 11 every 3 operating hours.
Change the punch, die and guide plate in good time
max
when worn. Only sharp tools produce a good cutting
quality and make the machine last longer.
Changing the Die
Loosen and remove both screws 9. Insert a new die
and tighten it firmly with the screws 9.
d
max
A worn die must not be reground.
[mm]
2
]
Changing the Guide Plate
3.5
The guide plate 11 is used to protect the die holder 15.
2.4
To change the guide plate, remove the die 14 (refer to
"Changing the Die"). Loosen and remove the screws
1.6
13 on the hold down guide. Remove the hold down
4 guide 12 and the guide plate 11.
Insert a new guide plate. Attach the die with the screws
9 and the hold down guide via the screws 13. Tighten
the screws.
English–4