BOSCH GNA 75-16 Professional Nibbler Instruction Manual

: June 13, 2024
: Bosch

Table of Contents

BOSCH GNA 75-16 Professional Nibbler
OVERVIEW
Safety Instructions
Safety instructions for nibblers
Product Description and Specifications
Technical Data
Operation
Maintenance and Service
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BOSCH GNA 75-16 Professional Nibbler

OVERVIEW

Safety Instructions

General Power Tool Safety Warnings

WARNING Read all safety warnings, instruc-tions, illustrations and specifications provided with this power tool. Failure to follow all in- structions 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.

Work area safety

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 that may ignite the dust or fumes.
Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

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 elec-tric shock.
Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep the 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 exten-sion cord suitable for outdoor use. The 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. The 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 a 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, jewelry 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 con-nected and properly used. Use of dust collection can reduce dust-related hazards.
Do not let familiarity gained from the frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe in-jury 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. by 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 accessories 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 to the cord.

Products sold in GB only:
Your product is fitted with a BS 1363/A approved electric plug with an 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 main socket elsewhere.

Product Description and Specifications

Read all the safety and general instructions. Failure to observe the safety and general in-structions 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.

On/off switch
Die holder screw
Handle (insulated gripping surface)
O-ring
Die, holder,
Punch
Die
Rubber ring for knurled screw
Knurled screw for die

Technical Data

about steel sheets of up to 400 N/mm2
Weight without mains connection cable and 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 are determined according to EN 62841‑2‑8. Typically, the A-weighted noise levels of the power tool are: Sound pressure level 93 dB(A); and sound power level 101 dB(A). Uncertainty K = 3 dB. Wear hearing protection! Vibration total values ah (triax vector sum) and uncertainty Determined according to EN 62841‑2‑8: ah = 6 m/s2, K = 1.5 m/s2. The vibration level and noise emission value given in these instructions have been measured per 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 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 organizing workflows correctly.

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.

Switching On and Off

To switch on the power tool, slide the on/off switch (1) forward so that I appears on the switch.
To lock the on/off switch (1), push down on the front of the switch as well.
To switch off the power tool, release the on/off switch (1). When the on/off switch is locked, press down on the back of the switch and then release it.

Changing the cutting direction
To change the cutting direction, the die holder (5) can be turned to three positions, each offset by 90°. Cutting towards the rear (towards the housing of the machine) is not possible.
To turn the die holder (5), loosen the die holder screw (2) until the die holder can be turned. Turn it 90° to the right or the left concerning the longitudinal axle of the power tool.
Make sure that the screw (2) engages in the drill hole of the die holder (5). Tighten the screw.

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 to 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 vertically 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 dmax depends on the strength properties of the material to be cut. The power tool allows for the cutting of metal sheet to the following thicknesses:

Lubricating/cooling the punch
To extend the service life of the punch (6), 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.

Cutting along a cutting mark or with a guide
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 tem-plate. For inside cuts, a hole with a diameter of 21 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.

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 center that is authorized to repair Bosch power tools. Clean and lubricate the punch (6) and die (7) every three operating hours. Change the punch and die in good time when worn. Only sharp tools produce a good cutting quality and make the power tool last longer. The punch (6) and the die (7) may not be resharpened.

Changing the die
Unscrew the knurled screw (9) from the die holder (5). Take out the die (7). If necessary, clean the die holder (5). Put a new, well-greased die (7) into the die holder. Pay attention to the alignment of the flat side. Screw back on the knurled screw (9) with the rubber ring (8) attached. Use a hex key to tighten the screw against the resistance of the rubber ring (3–4 Nm).

Changing the punch
Loosen the die holder screw (2) and pull the die holder (5) completely out of the housing. Slide the punch (6) sideways out of the mounting and pull it out in a downward motion. Put a new, well-greased punch (6) in the groove of the mounting and center it. Push the die holder (5) carefully over the punch and back into the housing. Turn the die holder into one of the three possible positions depending on the cutting direction re-quired. Firmly tighten the die holder screw (2).

After-Sales Service and Application Service
Our after-sales service responds to your questions concerning the 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: (0344) 7360109 E-Mail: boschservicecentre@bosch.com

You can find further service addresses at:www.bosch- pt.com/serviceaddresses

Disposal
The power tool, accessories and packaging should be re-cycled 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 of 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 the 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.

EU Declaration of Conformity

Nibbler Article number
- We declare under our sole responsibility that the stated products comply with all applicable provisions of the directives and regulations listed below and conform with the following standards. Technical file at: