Bedienungsanleitung Bosch GNA 75-16 Professional (Seite 10 von 124) (Alle Sprachen)

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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

]

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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