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Bosch GNA 75-16 Professional Manual

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10 | English
1 609 92A 1S6 | (19.1.16) Bosch Power Tools
To switch off the machine, release the On/Off switch 1. When
the On/Off switch is locked, press on the rear of the switch
and then release it.
To save energy, only switch the power tool on when using it.
Changing the Cutting Direction
For changing the cutting direction, the die holder 4 can be
turned to three positions, each offset by 90°. Cutting toward
the rear (toward the housing of the machine) is not possible.
For turning the die holder 4 loosen the screw 2 until you can
turn the die holder. Turn it 90 ° to the right or the left in rela-
tion to the longitudinal axle of the power tool.
Make sure that the screw 2 engages into the borehole of the
die holder 4. Tighten the screw 2.
Working Advice
Before any work on the machine itself, pull the mains
plug.
Exercise caution when handling the cutting chips. The
chips have sharp tips that can cause injuries.
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 significantly reduces
the service life of the cutting tools and can damage the ma-
chine.
The machine operates more quietly when it is raised slightly
during cutting. If the punch should become wedged during
cutting, switch the machine off, relubricate the punch and re-
lease the tension of the steel sheet. Do not exert force, other-
wise the punch and the die will become damaged.
Maximum Steel Sheet Cutting Capacity
The maximum steel sheet cutting capacity d
max
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:
Lubricating/Cooling the Punch
To increase the service life of the punch 5, you should use a
lubricant with good cooling function, e.g. cutting oil
2 607 001 409.
Apply a trail of lubricant beads onto the top side of the metal
sheet alongside the intended cutting line.
Cutting along a Cutting Mark or with a Guide
Straight cuts are carried out easier when the machine is guid-
ed alongside a rule.
Contours can be cut by guiding the machine along a template.
For inside cuts, pre-drilling a hole with a diameter of 21 mm is
necessary.
Maintenance and Service
Maintenance and Cleaning
For safe and proper working, always keep the machine
and ventilation slots clean.
Clean and lubricate the punch 5 and die 6 every 3 operating
hours.
Change the punch and die in good time when worn. Only
sharp tools produce a good cutting quality and make the ma-
chine last longer.
The punch 5 and the die 6 may not be reground.
Changing the Die
Unscrew the knurled screw 8 of the die holder 4. Take out the
die 6.
Il necessary, clean the die holder 4.
Put a new, well greased die 6 into the die holder. Pay attention
to the alignment of the flat side.
Screw the knurled screw 8 with attached rubber ring 7 back
on. Use a hex key to tighten the screw against the resistance
of the rubber ring (3–4 Nm).
Changing the Punch
Loosen the screw 2 and pull the die holder und 4 completely
out of the housing.
Slide the punch 5 sideways out of the mounting and pull it out
in a downward motion.
Put a new, well greased punch 5 in the groove of the mounting
and centre it.
Push the die holder 4 with caution over the punch 5 back into
the housing. Turn the die holder into one of the three possible
positions (see “Changing the Cutting Direction”, page 10).
Tighten the screw 2.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
After-sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al-
so be found under:
www.bosch-pt.com
Bosch’s application service team will gladly answer questions
concerning our products and their accessories.
In all correspondence and spare parts orders, please always
include the 10-digit article number given on the nameplate of
the product.
Material Max. strength property
[N/mm
2
]
d
max
[mm]
Steel 400 1.6
600 1.0
800 0.7
Aluminium 200 2.0
OBJ_BUCH-2741-001.book Page 10 Tuesday, January 19, 2016 1:20 PM
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