SKIL 3930 Brushless Cordless Angle Grinder Instruction Manual

SKIL 3930 Brushless Cordless Angle Grinder

Product Information

Specifications

• Model: 3930 (AG1*3930**)
• Type: Brushless Cordless Angle Grinder
• Manufacturer: SKIL BV
• Country of Origin: The Netherlands
• Website: www.skil.com

Product Usage Instructions

Charging the Angle Grinder
Before initial use, make sure to fully charge the angle grinder using the provided charger. Connect the charger to a power source and insert the battery pack into the charger. Allow the battery to charge completely before use.

Installing and Changing Discs
To install or change discs, make sure the angle grinder is turned off and disconnected from the power source. Follow the instructions in the user manual to securely attach or replace discs based on the type of work you are performing.

Operating the Angle Grinder
Ensure proper safety gear such as goggles and gloves are worn before operating the angle grinder. Hold the tool firmly with both hands and activate it using the designated switch. Apply gentle pressure while guiding the grinder along the work surface.

Maintenance and Care
After each use, clean the angle grinder to remove any debris or dust that may have accumulated. Regularly check for any loose parts or damage and replace them as needed. Store the angle grinder in a dry and secure place.

FAQ

• Q: How do I know when to replace the battery?
  A: If you notice a significant decrease in operating time or power output, it may be time to replace the battery. Refer to the user manual for specific instructions on battery replacement.

• Q: Can I use this angle grinder for cutting metal?
  A: Yes, this angle grinder is suitable for cutting metal. Make sure to use the appropriate cutting disc and follow safety guidelines while working with metal materials.

INTRODUCTION

• This tool is intended for light grinding, cutting and deburring metal and stone materials without the use of water
• This tool is not intended for professional use
• Do not apply pressure on the tool; let the speed of the cutting disc do the work
• Cutting operations with abrasive cut-off wheels are only allowed when a cut-off guard (available as an optional SKIL accessory 2610S00275) is used
• Read and save this instruction manual 3

TECHNICAL DATA

TOOL ELEMENTS

TOOL ELEMENTS 2

• A. Spindle
• B. Clamping flange
• C. Spanner
• D. Spindle-lock button
• E. Auxiliary handle
• F. Protective guard
• G. Protective guard screw
• H. Mounting flange
• J. On/off locking switch
• K. Ventilation slots
• L. Battery level indicator
• M. Protective guard lever

SAFETY

GENERAL POWER TOOL SAFETY WARNINGS

WARNING
Read all safety warnings, instructions, illustrations and specifications 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.

1. WORK AREA SAFETY
   • Keep the 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.
2. 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 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.
3. 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.
4. 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 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.
5. BATTERY TOOL USE AND CARE
   • Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
   • Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fire.
   • When the battery pack is not in use, keep it away from other metal objects like paper clips, coins, keys, nails, screws, or other small metal objects that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fire.
   • Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts the eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
   • Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behaviour resulting in fire, explosion or risk of injury.
   • Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 130°C may cause an explosion.
   • Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.
6. 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.
   • Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.

SAFETY INSTRUCTIONS FOR ANGLE GRINDERS

1. SAFETY WARNINGS COMMON FOR GRINDING OR ABRASIVE CUTTING-OFF OPERATIONS

   • This power tool is intended to function as a grinder or cut-off tool. Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.

   • This power tool is not recommended for sanding, wire brushing or polishing. Operations for which the power tool was not designed may create a hazard and cause personal injury.

   • Do not use accessories that are not specifically designed and recommended by the tool manufacturer. Just because the accessory can be attached to your power tool, it does not assure safe operation.

   • The rated speed of the accessory must be at least equal to the maximum speed marked on the power tool. Accessories running faster than their rated speed can fly apart.

   • The outside diameter and the thickness of your accessory must be within the capacity rating of your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled.

   • The threaded mounting of accessories must match the grinder spindle thread. For accessories mounted by flanges, the arbour hole of the accessory must fit the locating diameter of the flange. Accessories that do not match the mounting hardware of the power tool will run out of balance, vibrate excessively and may cause loss of control.

   • Do not use a damaged accessory. Before each use inspect the accessories such as abrasive wheels for chips and cracks, backing pads for cracks, tear
     or excess wear, and wire brushes for loose or cracked wires. If the power tool or accessory is dropped, inspect for damage or install an undamaged accessory. After inspecting and installing an accessory, position yourself and bystanders away from the plane of the rotating accessory and run the power tool at maximum no-load speed for one minute. Damaged accessories will normally break apart during this test time.

   • Wear personal protective equipment. Depending on the application, use a face shield, safety goggles or safety glasses. As appropriate, wear a dust mask, hearing protectors, gloves and a shop apron capable of stopping small abrasive or workpiece fragments. The eye protection must be capable of stopping flying debris generated by various operations. The dust mask or respirator must be capable of filtrating particles generated by your operation. Prolonged exposure to high-intensity noise may cause hearing loss.

   • Keep bystanders a safe distance away from the work area. Anyone entering the work area must wear personal protective equipment. Fragments of the workpiece or of a broken accessory may fly away and cause injury beyond the immediate area of operation.

   • Hold power tool by insulated gripping surfaces only, when performing an operation where the accessory may contact hidden wiring. An accessory contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.

   • Position the cord clear of the spinning accessory. If you lose control, the cord may be cut or snagged and your hand or arm may be pulled into the spinning accessory.

   • Never lay the power tool down until the accessory has come to a complete stop. The spinning accessory may grab the surface and pull the power tool out of your control.

   • Do not run the power tool while carrying it at your side. Accidental contact with the spinning accessory could snag your clothing, pulling the accessory into your body.

   • Regularly clean the power tool’s air vents. The motor’s fan will draw dust inside the housing and excessive accumulation of powdered metal may cause electrical hazards.

   • Do not operate the power tool near flammable materials. Sparks could ignite these materials.

   • Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.

2. KICKBACK AND RELATED WARNINGS

   • Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush or any other accessory. Pinching or snagging causes rapid stalling of the rotating accessory which in turn causes the uncontrolled power tool to be forced in the direction opposite of the accessory’s rotation at the point of the binding.
   • For example, if an abrasive wheel is snagged or pinched by the workpiece, the edge of the wheel that is entering into the pinch point can dig into the surface of the material causing the wheel to climb out or kick out. The wheel may either jump toward or away from the operator, depending on the direction of the wheel’s movement at the point of pinching. Abrasive wheels may also break under these conditions.
   • Kickback is the result of power tool misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below.
   • Maintain a firm grip on the power tool and position your body and arm to allow you to resist kickback forces. Always use an auxiliary handle, if provided, for maximum control over kickback or torque reaction during start-up. The operator can control torque reactions or kickback forces if proper precautions are taken.
   • Never place your hand near the rotating accessory. The accessory may kick back over your hand.
   • Do not position your body in the area where the power tool will move if kickback occurs. Kickback will propel the tool in the direction opposite to the wheel’s movement at the point of snagging.
   • Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing tend to snag the rotating accessory and cause loss of control or kickback.
   • Do not attach a saw chain woodcarving blade or toothed saw blade. Such blades create frequent kickbacks and loss of control.

3. SAFETY WARNINGS SPECIFIC FOR GRINDING AND ABRASIVE CUTTING-OFF OPERATIONS

   • Use only wheel types that are recommended for your power tool and the specific guard designed for the selected wheel. Wheels for which the power tool was not designed cannot be adequately guarded and are unsafe.
   • The grinding surface of the centre depressed wheels must be mounted below the plane of the guard lip. An improperly mounted wheel that projects through the plane of the guard lip cannot be adequately protected.
   • The guard must be securely attached to the power tool and positioned for maximum safety so that the least amount of wheel is exposed towards the operator. The guard helps to protect the operator from broken wheel fragments, accidental contact with the wheel and sparks that could ignite clothing.
   • Wheels must be used only for recommended applications. For example: Do not grind with the side of a cut-off wheel. Abrasive cut-off wheels are intended for peripheral grinding; side forces applied to these wheels may cause them to shatter.
   • Always use undamaged wheel flanges that are of the correct size and shape for your selected wheel. Proper wheel flanges support the wheel thus reducing the possibility of wheel breakage. Flanges for cut-off wheels may be different from grinding wheel flanges.
   • Do not use worn-down wheels from larger power tools. A wheel intended for a larger power tool is not suitable for the higher speed of a smaller tool and may burst.

4. ADDITIONAL SAFETY WARNINGS SPECIFIC FOR CUTTING OFF OPERATIONS

   • Do not “jam” the cut-off wheel or apply excessive pressure. Do not attempt to make an excessive depth of cut. Overstressing the wheel increases the loading and susceptibility to twisting or binding of the wheel in the cut and the possibility of kickback or wheel breakage.
   • Do not position your body in line with and behind the rotating wheel. When the wheel, at the point of operation, is moving away from your body, the possible kickback may propel the spinning wheel and the power tool directly at you.
   • When the wheel is binding or when interrupting a cut for any reason, switch off the power tool and hold the power tool motionless until the wheel comes to a complete stop. Never attempt to remove the cut-off wheel from the cut while the wheel is in motion, otherwise, kickback may occur. Investigate and take corrective action to eliminate the cause of wheel binding.
   • Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and carefully re-enter the cut. The wheel may bind, walk up or kick back if the power tool is restarted in the workpiece.
   • Support panels or any oversized workpiece to minimize the risk of wheel pinching and kickback. Large workpieces tend to sag under their own weight. Supports must be placed under the workpiece near the line of cut and near the edge of the workpiece on both sides of the wheel.
   • Use extra caution when making a “pocket cut” into existing walls or other blind areas. The protruding wheel may cut gas or water pipes, electrical wiring or objects that can cause kickback.

ADDITIONAL SAFETY INSTRUCTIONS

GENERAL

• This tool is not suitable for wet grinding/cutting
• Only use the flanges that are supplied with this tool
• This tool should not be used by people under the age of 16 years
• Remove the battery from the tool before making any adjustments or changing accessories

ACCESSORIES

• SKIL can ensure flawless functioning of the tool only when original accessories are used
• For mounting/using non-SKIL accessories observe the instructions of the manufacturer concerned
• Use only grinding/cutting discs with a maximum thickness of 6 mm and a spindle hole diameter of 22 mm
• Never use reducers or adaptors to fit large-hole grinding/cutting discs
• Never use accessories with a “blind” threaded hole smaller than M14 x 21 mm
• Handle and store grinding/cutting discs carefully to avoid chipping and cracking

BEFORE USE

• Before using the tool for the first time, it is recommended to receive practical information
• Always mount auxiliary handle E 2 and protective guard F 2; never use the tool without them
• Use suitable detectors to find hidden utility lines or call the local utility company for assistance (contact with electric lines can lead to fire or electrical shock; damaging a gas line can result in an explosion; penetrating a water pipe will cause property damage or an electrical shock)
• Do not work materials containing asbestos (asbestos is considered carcinogenic)
• Dust from material such as paint containing lead, some wood species, minerals and metal may be harmful (contact with or inhalation of the dust may cause allergic reactions and/or respiratory diseases to the operator or bystanders); wear a dust mask and work with a dust extraction device when connectable
• Certain kinds of dust are classified as carcinogenic (such as oak and beech dust), especially in conjunction with additives for wood conditioning; wear a dust mask and work with a dust extraction device when connectable
• Follow the dust-related national requirements for the materials you want to work with
• Be careful when cutting grooves, especially in supporting walls (slots in supporting walls are subject to country-specific regulations; these regulations are to be observed under all circumstances)
• Secure the workpiece (a workpiece clamped with clamping devices or in a vice is held more securely than by hand)
• Do not clamp the tool in a vice

DURING USE

• In case of electrical or mechanical malfunction, immediately switch off the tool and remove the battery
• In case of battery protection cut off, or when the battery is removed, the tool will not restart on its own; for restarting the tool unlock the on/off switch and switch on the tool again w

AFTER USE
After switching off the tool, never stop the rotation of the accessory by a lateral force applied against it

BATTERIES

• The battery supplied is partially charged (to ensure full capacity of the battery, completely charge the battery in the battery charger before using your power tool for the first time)
• Only use the following batteries and chargers with this tool
  • SKIL battery: BR1*31****
  • SKIL charger: CR1*31****
• Do not use the battery when damaged; it should be replaced
• Do not disassemble the battery
• Do not expose the tool/battery to rain
• Permitted ambient temperature (tool/charger/battery):
  • when charging 4…40°C
  • during operation –20…+50°C
  • during storage –20…+50°C

EXPLANATION OF SYMBOLS ON TOOL/BATTERY

• 3 Read the instruction manual before use
• 4 Wear protective glasses and hearing protection
• 5 Batteries may explode when disposed of in fire, so do not burn the battery for any reason
• 6 Store tool/charger/battery in locations where the temperature will not exceed 50°C
• 7 Do not dispose of electric tools and batteries together with household waste material

USE

• Charging battery
  read the safety warnings and instructions provided with the charger

• Removing/installing the battery 2

• Battery level indicator 8

  • Press the battery level indicator button L to show the current battery level 8a
  • when the lowest level of the battery indicator starts flashing after pressing button L 8b, the battery is empty
  • when 2 levels of the battery indicator started flashing after pressing button L 8c, the battery is not within the allowable operating temperature range

• Battery protection
  The tool is suddenly switched off or prevented from being switched on, when

  • the load is too high –> remove load and restart
  • the battery temperature is not within the allowable operating temperature range of -20 to +50°C –> 2 levels of the battery level indicator start flashing when pressing button L 8c; wait until battery has returned within the allowable operating temperature range
  • the battery is nearly empty (to protect against deep discharge) –> a low battery level or flashing low battery level 8b is shown by the battery level indicator when pressing button L; charge battery
  • do not continue to press the on/off switch after the tool is switched off automatically; the battery may be damaged

• Mounting of accessories 2

  • remove the battery from the tool
  • clean spindle A and all parts to be mounted
  • tighten clamping flange B with spanner C while pushing spindle-lock button D
  • push spindle-lock button D only when spindle A is at a standstill
  • for removing accessories handles vice-versa
  • grinding/cutting discs become very hot during use; do not touch them until they have cooled down
  • never use a grinding/cutting disc without the label (“blotter”) which is glued onto it (if provided)

• Mounting of auxiliary handle E 9

  • remove the battery from the tool
  • screw auxiliary handle E on the right, the top, or the left of the tool (depending on the work to be carried out)

• Removing/mounting/adjusting of protective guard F 10

  • remove the battery from the tool
  • ensure that the closed side of the protective guard always points to the operator
  • if necessary, adjust protective guard F by tightening screw G which is pre-set at manufacturing (ensure that the protective guard is closed)

• Before using the tool

  • ensure that the accessory is correctly mounted and firmly tightened
  • check if the accessory runs freely by turning it by hand
  • test-run tool for at least 60 seconds at highest no-load speed in a safe position
  • stop immediately in case of considerable vibration or other defects and check the tool to determine the cause

• On/off locking switch J 11

  • switch on tool 11a
  • be aware of the sudden impact when the tool is switched on
  • before the accessory reaches the workpiece, the tool should run at full speed
  • lock switch 11b
  • unlock switch/switch off tool 11c
  • before switching off the tool, you should lift it from the workpiece
  • the accessory continues to rotate for a short time after the tool has been switched off

• Grinding 12

  • move the tool back and forth with moderate pressure
  • never use a cutting disc for side grinding

• Cutting 13

  • do not tilt the tool while cutting
  • always move the tool in the same direction as the arrow on the tool head, to prevent the tool from being pushed out of the cut in an uncontrolled manner
  • do not apply pressure on the tool; let the speed of the cutting disc do the work
  • the working speed of the cutting disc depends on the material to be cut
  • do not brake cutting discs with side pressure

• Holding and guiding the tool

  • always hold the tool firmly with both hands, so you will have full control of the tool at all times
  • while working, always hold the tool at the greycoloured grip area(s) 14
  • provide for a secure stance
  • pay attention to the direction of rotation; always hold the tool so, that sparks and grinding/cutting dust fly away from the body
  • keep ventilation slots K 2 uncovered

• Mounting/removing spanner C 15

  • only applicable if the tool is executed with an auxiliary handle with integrated spanner storage

APPLICATION ADVICE

For more information see www.skil.com.

MAINTENANCE/SERVICE

• This tool is not intended for professional use
• Always keep the tool clean (especially ventilation slots K 2)
• remove the battery from the tool before cleaning
• If the tool should fail despite the care taken in manufacturing and testing procedures, repair should be carried out by an after-sales service centre for SKIL power tools
  • send the tool undismantled together with proof of purchase to your dealer or the nearest SKIL service station (addresses as well as the service diagram of the tool are listed on www.skil.com)
• Be aware that damage due to overload or improper handling of the tool will be excluded from the warranty (for the SKIL warranty conditions see www.skil.com or ask your dealer)

ENVIRONMENT

Only for EU countries

• Do not dispose of electric tools, accessories and packaging together with household waste material
• in observance of European Directive 2012/19/EC on waste of electric and electronic equipment and its implementation by national law, electric tools that have reached the end of their life must be collected separately and returned to an environmentally compatible recycling facility
• symbol 7 will remind you of this when the need for disposing of occurs
• before disposal protect battery terminals with heavy tape to prevent short-circuit

Only for the UK

• Do not dispose of electric tools, accessories and packaging together with household waste material
• in observance of on Waste Electric and Electronic Equipment Regulations 2013 (SI 2013/3113), electric tools that have reached the end of their life must be collected separately and returned to an environmentally compatible recycling facility
• symbol 7 will remind you of this when the need for disposing of occurs
• before disposal protect battery terminals with heavy tape to prevent short-circuit

NOISE/VIBRATION

• Measured in accordance with EN 60745 the sound pressure level of this tool is 81.5 dB(A) and the sound power level 92.5 dB(A) (uncertainty K = 3 dB), and the vibration when surface grinding 3.9 m/s² (triax vector sum; uncertainty K = 1.5 m/s²)
• other applications (such as cutting-off) may have different vibration values
• The vibration emission level has been measured in accordance with a standardised test given in EN 60745; it may be used to compare one tool with another and as a preliminary assessment of exposure to vibration when using the tool for the applications mentioned
• using the tool for different applications, or with different or poorly maintained accessories, may significantly increase the exposure level
• the times when the tool is switched off or when it is running but not actually doing the job, may significantly reduce the exposure level
• protect yourself against the effects of vibration by maintaining the tool and its accessories, keeping your hands warm, and organizing your work patterns

EU Declaration of conformity

Cordless angle grinder

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 are in conformity with the following standards. Technical file at: ****

WWW.SKIL.COM

Documents / Resources

| SKIL 3930 Brushless Cordless Angle Grinder [pdf] Instruction Manual
3930 Brushless Cordless Angle Grinder, 3930, Brushless Cordless Angle Grinder, Cordless Angle Grinder, Angle Grinder, Grinder
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References

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