GNA 3 5 Professional - Saw BOSCH - Free user manual and instructions

Brand	Bosch
Model	GNA 3.5 Professional
Product type	Nibbler
Main use	Cutting of metal sheets and plates
Power supply	220-240 V, 50-60 Hz (mains)
Power consumption	550 W
Maximum cutting capacity (steel)	3.5 mm
Blade stroke	5 mm
No-load speed	2000-2200 min⁻¹
Weight	1.5 kg
Dimensions (L x W x H)	300 x 80 x 150 mm
Cable length	2.5 m
Protection class	II (double insulation)
Sound pressure level	85 dB(A)
Sound power level	96 dB(A)
Vibrations (hand-arm)	7.5 m/s²
Main features	Precise cutting without deformation, easy guidance, quick cutter change
Maintenance and cleaning	Regularly clean ventilation slots, grease cutting head
Safety	Wear protective gloves and goggles, unplug before maintenance
Spare parts and repairability	Replacement cutter (3.5 mm), cutter support, available from Bosch after-sales service
Package contents	Machine, cutting cutter, hex key, user manual

Frequently Asked Questions - GNA 3 5 Professional BOSCH

How to change the cutting cutter on the Bosch GNA 3.5 Professional?

Unplug the machine. Use the supplied hex key to unscrew the cutter retaining screw. Remove the old cutter and insert the new one, then tighten the screw. Consult the manual for the recommended torque.

What thickness of sheet metal can the GNA 3.5 cut?

The GNA 3.5 can cut steel sheets up to 3.5 mm thick, and thicker aluminum sheets (up to 4 mm). For optimal results, use a cutter suitable for the material.

Can you cut curved shapes with this nibbler?

Yes, the GNA 3.5 can make curved cuts with a minimum radius of approximately 50 mm. For tighter curves, use a thin cutter and advance slowly.

What is the recommended cutting speed?

The no-load speed is approximately 2000-2200 min⁻¹. For steel, use a medium speed. For aluminum, a higher speed is possible. Adjust the feed rate to avoid overheating.

How to maintain the slide of the GNA 3.5?

Clean the slide regularly with a dry cloth. Apply a thin layer of special power tool grease once a month or after 20 hours of use.

The machine overheats, what to do?

Check that the ventilation slots are not blocked. Let the machine cool for 15 minutes. If the problem persists, check the condition of the motor carbon brushes (replace if worn) or contact Bosch after-sales service.

What type of cutter to use for stainless steel?

Use a carbide cutter specifically for stainless steel. Standard cutters wear quickly. Refer to the Bosch catalog for the appropriate reference (e.g. 2 608 630 011).

Can I use the GNA 3.5 on wood?

No, this machine is designed exclusively for metal. For wood, use a jigsaw or a suitable circular saw.

Where to find the complete user manual?

The manual is available for free download on notice-facile.com. You can also request a paper version from Bosch customer service.

How to replace the motor carbon brushes?

Unplug the machine. Remove the side caps using a screwdriver. Extract the old brushes and insert the new ones in the correct orientation. Replace the caps. The first use may require a 5-minute run-in.

USER MANUAL GNA 3 5 Professional BOSCH

German

Safety Instructions

www.bosch-pt.com/serviceaddresses

Disposal

General Power Tool Safety Warnings

WARNING

Read all safety warnings, instructions, illustrations and specifications.

tions provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

▶ Keep work area clean and well lit. Cluttered or dark areas invite accidents. ▶ Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes. ▶ Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

▶ Keep work area clean and well lit. Cluttered or dark areas invite accidents. ▶ Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes. ▶ Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

▶ Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock. ▶ Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded. ▶ Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock. ▶ Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock. ▶ When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock. ▶ If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.

▶ Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock. ▶ Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded. ▶ Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock. ▶ Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock. ▶ When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock. ▶ If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.

Personal safety

▶ Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury. ▶ Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries. ▶ Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power tools that have the switch on invites accidents.

Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury. ▶ Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations. ▶ Dress properly. Do not wear loose clothing or jewellery. Keep your hair and clothing away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts. ▶ If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards. ▶ Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.

Power tool use and care

Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed. Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired. Disconnect the plug from the power source and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally. Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users. Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool's operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools. Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control. Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation. Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.

Service

Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Safety instructions for nibblers

Hold the power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock. This power tool is not suitable for bench-mounted use. It must not be clamped into a vice or fastened to a workbench, for example. Wear protective gloves during work and pay particular attention to the cord. Sharp burrs develop on the cut sheets; these can cause injury or damage the cord.

Products sold in GB only:

Your product is fitted with a BS 1363/A approved electric plug with internal fuse (ASTA approved to BS 1362). If the plug is not suitable for your socket outlets, it should be cut off and an appropriate plug fitted in its place by an authorized customer service agent. The replacement plug should have the same fuse rating as the original plug. The severed plug must be disposed of to avoid a possible shock hazard and should never be inserted into a mains socket elsewhere.

Hold the power tool firmly with both hands and make sure you have a stable footing. The power tool can be more securely guided with both hands.

Product Description and Specifications

Read all the safety and general instructions.

Failure to observe the safety and general instructions may result in electric shock, fire and/or serious injury.

Please observe the illustrations at the beginning of this operating manual.

Intended Use

The power tool is intended for cutting sheet metal without deforming the material and is suitable for straight cuts, cut-outs and narrow curves.

Product Features

The numbering of the product features refers to the diagram of the power tool on the graphics page.

(1) Screw for handle holder (2) Handle holder (3) Auxiliary handle (4) Hex key (5) On/off switch

(6) Thread for auxiliary handle (7) Screw for punch fastener (8) Hole on die holder (9) Screw for die (10) Punch (11) Guide plate (12) Hold-down device (13) Screw for hold-down device (14) Die (15) Die holder (16) Punch positioner (17) Handle (insulated gripping surface)

Technical Data

Nibbler GNA 3,5
Article number		0 601 533 1..
Rated power input W 620
Power output W 340
No-load stroke rate n0	min-1	1000
Stroke speed under load min	-1	670
Max. steel sheet cutting capacityA)	mm 3.5
Cutting width mm 6
Smallest curve radius mm 70
WeightB)	kg 3.5
Protection class		☐/II

A) with reference to steel sheet of up to 400 N/mm² B) Weight without mains connection cable and without mains plug The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models. Values can vary depending on the product, scope of application and environmental conditions. To find out more, visit www.bosch-professional.com/wac.

Noise/Vibration Information

Noise emission values determined according to EN 62841-2-8.

Typically, the A-weighted noise levels of the power tool are: Sound pressure level 88 dB(A); sound power level 96 dB(A). Uncertainty K = 3 dB.

Wear hearing protection!

Vibration total values a_h (triax vector sum) and uncertainty K determined according to EN 62841-2-8: a_h = 7m / s² K = 1.5m / s²

The vibration level and noise emission value given in these instructions have been measured in accordance with a standardised measuring procedure and may be used to compare power tools. They may also be used for a preliminary estimation of vibration and noise emissions.

The stated vibration level and noise emission value represent the main applications of the power tool. However, if the

power tool is used for other applications, with different accessories or is poorly maintained, the vibration level and noise emission value may differ. This may significantly increase the vibration and noise emissions over the total working period.

To estimate vibration and noise emissions accurately, the times when the tool is switched off or when it is running but not actually being used should also be taken into account. This may significantly reduce vibration and noise emissions over the total working period.

Implement additional safety measures to protect the operator from the effects of vibration, such as servicing the power tool and accessories, keeping their hands warm, and organising workflows correctly.

Assembly

Auxiliary handle

Screw the auxiliary handle (3) into the thread (6) on the left-or right-hand side of the housing.

You can use the handle holder (2) to extend the auxiliary handle and reposition it at any angle for a safe work posture that minimises fatigue.

If the auxiliary handle is already fitted, unscrew it from the thread (6). Use the screw (1) to screw the handle holder (2) in the thread at the required angle on the left- or right-hand side of the housing. Screw the auxiliary handle into the narrower end of the handle holder on the left- or right-hand side accordingly.

If you attach the handle holder on the left-hand side of the housing, make sure that it does not cover the on/off switch (5).

Operation

▶ Products that are only sold in AUS and NZ: Use a residual current device (RCD) with a nominal residual current of 30 mA or less.

Starting Operation

▶ Pay attention to the mains voltage. The voltage of the power source must match the voltage specified on the rating plate of the power tool.

Adjusting the hold-down device

Adjusting the hold-down device (12) to the thickness of the sheet being cut eliminates vibrations.

Hold the power tool so that the die (14) touches the underside of the sheet to be cut. Loosen the screws (13) on the hold-down device. Push the hold-down device (12) onto the sheet, leaving a little clearance (approx. 0.3 mm). Make sure that the hold-down device is straight and not at an angle. Retighten the screws (13).

Switching On and Off

To switch on the power tool, slide the on/off switch (5) forwards so that I appears on the switch.

To lock the on/off switch (5), push down on the front of the switch as well.

To switch off the power tool, release the on/off switch (5). When the on/off switch is locked, press down on the back of the switch and then release it.

Working Advice

▶ Pull the plug out of the socket before carrying out any work on the power tool. This power tool is not suitable for bench-mounted use. It must not be clamped into a vice or fastened to a workbench, for example. ▶ Wear protective gloves during work and pay particular attention to the cord. Sharp burrs develop on the cut sheets; these can cause injury or damage the cord. ▶ Exercise caution when handling the cutting chips. The chips have sharp tips that can cause injuries.

Apply the power tool to the workpiece only when switched on. Always hold the power tool vertical to the surface of the steel sheet and do not tilt it.

The cut is made as the punch moves downwards. Guide the power tool evenly, pushing it gently in the cutting direction. Applying too much pressure to the power tool will significantly reduce the service life of application tools and can damage the power tool.

The power tool operates more quietly when it is raised slightly during cutting. If the punch jams during cutting, switch the power tool off, lubricate the punch and release the sheet. Do not use force to do this, as this will damage the punch and the die.

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 power tool allows for cutting of metal sheet to the following thicknesses:

Material max. strength(N/mm2)		dmax (mm)
Steel 400		3.5
	600	2.4
	800	1.6
Aluminium 200		4.0

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 line of lubricant to the top side of the metal sheet along the intended cutting line.

For long periods of continual use or for work with high frictional wear (e.g. when cutting aluminium), the application tool should be immersed in a container of lubricant at regular intervals.

Cutting along a scribe line or with a template

You can use the projection on the hold-down device (12) as the cut mark when cutting along a scribe line.

Straight cuts are carried out easier when the power tool is guided alongside a rule.

Contours can be cut by guiding the power tool along a template.

For inside cuts, a hole with a diameter of 41 mm must be pre-drilled.

Maintenance and Service

Maintenance and Cleaning

Pull the plug out of the socket before carrying out any work on the power tool. To ensure safe and efficient operation, always keep the power tool and the ventilation slots clean.

In order to avoid safety hazards, if the power supply cord needs to be replaced, this must be done by Bosch or by an after-sales service centre that is authorised to repair Bosch power tools.

Clean and lubricate the punch (10), die (14) and guide plate (11) after every three hours in operation.

Change the punch, die and guide plate in good time when worn. Only sharp tools achieve a good cutting quality and make the power tool last longer.

Changing the die

Loosen and remove the two screws (9). Insert a new die (14) and tighten it firmly with the screws.

Worn dies must not be reground.

Changing the guide plate

The guide plate (11) is used to protect the die holder (15).

To change the guide plate (11), remove the die (14) as described above. Then loosen and remove the screws (13) on the hold-down device. Remove the hold-down device (12) and the guide plate.

Insert a new guide plate (11). Secure the die (14) with the screws (9) and secure the hold-down device (12) with the screws (13). Tighten all screws firmly.

Changing the punch

Insert the hex key (4) into the screw head of the punch positioner (16). Turn the punch positioner until the screw (7) is in the exact centre of the hole (8) on the die holder. Remove the hex key from the punch positioner.

Remove the die (14), the hold-down device (12) and the guide plate (11) as described above.

Loosen the screw (7) on the punch fastener and pull the punch (10) downwards out of the tool. Thoroughly lubricate the new or reground punch and insert it from underneath.

Retighten the screw (7) on the punch fastener.

Attach the guide plate (11), the hold-down device (12) and the die (14) as described above.

Regrinding the punch

Regrinding the punch in good time (e.g. with a diamond grinding disc) can often prevent the punch (10) from chipping. Severely damaged punches must not be reground.

The punch must not be reground by more than 1 mm. Grinding must only be carried out on the cutting face and at exactly 90° to the centre axis.

Gently sharpen the cutting edges of the punch using a fine whetstone.

After-Sales Service and Application Service

Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts. You can find explosion drawings and information on spare parts at: www.bosch-pt.com

The Bosch product use advice team will be happy to help you with any questions about 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.

Great Britain

Robert Bosch Ltd. (B.S.C.)

P.O. Box 98

Broadwater Park

North Orbital Road

Denham Uxbridge

UB 9 5HJ

At www.bosch-pt.co.uk you can order spare parts or arrange the collection of a product in need of servicing or repair.

Tel. Service: [phone]

E-Mail: [e-mail]

You can find further service addresses at:

www.bosch-pt.com/serviceaddresses

Disposal

The power tool, accessories and packaging should be recycled in an environmentally friendly manner.

Do not dispose of power tools along with household waste.

Only for EU countries:

Power tools that are no longer suitable for use must be disposed of separately. Use the designated collection systems. If disposed incorrectly, waste electrical and electronic equipment may have harmful effects on the environment and human health, due to the potential presence of hazardous substances.

Only for United Kingdom:

According to The Waste Electrical and Electronic Equipment Regulations 2013 (SI 2013/3113) (as amended), products that are no longer usable must be collected separately and disposed of in an environmentally friendly manner.

French

Robert Bosch (France) S.A.S.

www.bosch-pt.com/serviceaddresses

Calle Robert Bosch No. 405

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

Bosch Service Center

Telegrafvej 3

2750 Ballerup

Spare parts can be ordered online at www.bosch-pt.dk, or a repair order can be created.

Service Center phone: [phone]

Fax: [phone]

E-mail: [e-mail]

www.bosch-pt.com/serviceaddresses

Disposal

Bosch Service Center

Telegrafvej 3

2750 Ballerup

Denmark

Tel.: [phone] (within Sweden)

Fax: [phone]

www.bosch-pt.com/serviceaddresses

Waste management

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

www.bosch-pt.com/serviceaddresses

Disposal

Robert Bosch Sp. z o.o.

www.bosch-pt.com/serviceaddresses

Waste disposal

Bosch Service Center PT

K Vápence 1621/16

692 01 Mikulov

www.bosch-pt.com/serviceaddresses

Disposal

Disposal

Removal

Disposal

Power tool service

Strada Horia Măcelariu Nr. 30-34, sector 1

013937 Bucharest

Disposal

Power tool service

Strada Horia Măcelariu Nr. 30-34, sector 1

013937 Bucharest, Romania

Disposal

Removal

Removal of waste

Disposal

Power tools, accessories, and packaging must be recycled in an environmentally friendly manner.

Disposal

Removal

Robert Bosch Morocco SARL

www.bosch-pt.com/serviceaddresses

www.bosch-pt.com/serviceaddresses