Dremel 8250 Manual

Symbols

1. Read these instructions.
2. Wear hearing protection.
3. Wear safety goggles.
4. Wear a dust mask.
5. Do not dispose of power tools along with householdwaste.
6. Class II version

Safety Instructions

General Power Tool Safety Warnings

Read all safety warnings and all instructions. Failure to follow the warnings and instructions 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 mainsoperated (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 which 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 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 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, clothing and gloves away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
• u 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.

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 the battery pack 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. 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.

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 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 eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.

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 all operations

Safety warnings common for grinding, sanding, wire brushing, polishing, carving or abrasive cutting-off operations

• This power tool is intended to function as a grinder, sander, wire brush, polisher, carving 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.
• Do not use accessories which 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 grinding accessories must be at least equal to the maximum speed marked on the power tool. Grinding accessories running faster than their rated speed can break and 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 controlled.
• The arbour size of wheels, sanding drums or any other accessory must properly fit the spindle or collet of the power tool. 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.
• Mandrel mounted wheels, sanding drums, cutters or other accessories must be fully inserted into the collet or chuck. If the mandrel is insufficiently held and/or the overhang of the wheel is too long, the mounted wheel may become loose and be ejected at high velocity.
• Do not use a damaged accessory. Before each use inspect the accessory such as abrasive wheels for chips and cracks, sanding drum for cracks, tear or excess wear, wire brush for loose or cracked wires. If 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 application, use face shield, safety goggles or safety glasses. As appropriate, wear dust mask, hearing protectors, gloves and workshop 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 work area. Anyone entering the work area must wear personal protective equipment. Fragments of workpiece or of a broken accessory may fly away and cause injury beyond immediate area of operation.
• Hold power tool by insulated gripping surfaces only, when performing an operation where the cutting accessory may contact hidden wiring. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock.
  Always hold the tool firmly in your hand(s) during the start-up. The reaction torque of the motor, as it accelerates to full speed, can cause the tool to twist. u Use clamps to support workpiece whenever practical. Never hold a small workpiece in one hand and the tool in the other hand while in use. Clamping a small workpiece allows you to use your hand(s) to control the tool. Round material such as dowel rods, pipes or tubing have a tendency to roll while being cut, and may cause the bit to bind or jump toward you.
• 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.
• After changing the bits or making any adjustments, make sure the collet nut, chuck or any other adjustment devices are securely tightened. Loose adjustment devices can unexpectedly shift, causing loss of control, loose rotating components will be violently thrown.
• 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 the 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. u Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.

Kickback and related warnings
Kickback is a sudden reaction to a pinched or snagged rotating wheel, sanding band, 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.
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 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. The operator can control kickback forces, if proper precautions are taken.
• Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a tendency to snag the rotating accessory and cause loss of control or kickback.
• Do not attach a toothed saw blade. Such blades create frequent kickback and loss of control.
• Always feed the bit into the material in the same direction as the cutting edge is exiting from the material (which is the same direction as the chips are thrown). Feeding the tool in the wrong direction causes the cutting edge of the bit to climb out of the work and pull the tool in the direction of this feed.
• When using rotary files, cut-off wheels, high-speed cutters or tungsten carbide cutters, always have the work securely clamped. These wheels will grab if they become slightly canted in the groove, and can kickback. When a cut-off wheel grabs, the wheel itself usually breaks. When the rotary file, high-speed cutter or tungsten carbide cutter grab, it may jump from the groove and you could lose control of the tool.

Safety warnings specific for grinding and abrasive cutting-off operations

• Use only wheel types that are recommended for your power tool and 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.
• For threaded abrasive cones and plugs use only undamaged wheel mandrels with an unrelieved shoulder flange that are of correct size and length. Proper mandrels will reduce the possibility of breakage.
• Do not "jam" a 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 snagging of the wheel in the cut and the possibility of kickback or wheel breakage. u Do not position your hand in line with and behind the rotating wheel. When the wheel, at the point of operation, is moving away from your hand, the possible kickback may propel the spinning wheel and the power tool directly at you.
• When wheel is pinched, snagged 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 cutoff 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 pinching or snagging.
• 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 kickback 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.
  Safety warnings specific for wire brushing operations u Be aware that wire bristles are thrown by the brush even during ordinary operation. Do not overstress the wires by applying excessive load to the brush. The wire bristles can easily penetrate light clothing and/or skin.
• Allow brushes to run at operating speed for at least one minute before using them. During this time no one is to stand in front or in line with the brush. Loose bristles or wires will be discharged during the run-in time.
• Direct the discharge of the spinning wire brush away from you. Small particles and tiny wire fragments may be discharged at high velocity during the use of these brushes and may become imbedded in your skin.

Additional safety information

• Do not touch grinding and cutting discs until they have cooled down. The discs can become very hot while working.
• Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more secure than by hand. u 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.
• In case of damage and improper use of the battery, vapours may be emitted. The battery can set alight or explode. Ensure the area is well ventilated and seek medical attention should you experience any adverse effects. The vapours may irritate the respiratory system.
• Do not modify or open the battery. There is a risk of short-circuiting.
• The battery can be damaged by pointed objects such as nails or screwdrivers or by force applied externally. An internal short circuit may occur, causing the battery to burn, smoke, explode or overheat.
• Only use the battery in Dremel or Bosch products. This is the only way in which you can protect the battery against dangerous overload.

Protect the battery against heat, e.g. against continuous intense sunlight, fire, dirt, water and moisture. There is a risk of explosion and short-circuiting.

Safety instructions for chargers

• This charger is not intended for use by children or persons with physical, sensory or mental limitations or a lack of experience or knowledge. This charger can be used by children aged 8 or older and by persons who have physical, sensory or mental limitations or a lack of experience or knowledge if a person responsible for their safety supervises them or has instructed them in the safe operation of the charger and they understand the associated dangers. Otherwise, there is a risk of operating errors and injuries.
• Supervise children during use, cleaning and maintenance. This will ensure that children do not play with the charger.
• Only charge Dremel Li-ion batteries with a capacity of 1,3 Ah or more. The battery voltage must match the battery charging voltage of the charger. Do not charge any non-rechargeable batteries. Otherwise there is a risk of fire and explosion.

Only use the charger in enclosed spaces and do not expose it to wet conditions. Water entering a charger increases the risk of electric shock.

• Keep the charger clean. Dirt poses a risk of electric shock.
• Always check the charge, including the cable and plug, before use. Stop using the charger if you discover any damage. Do not open the charger yourself, and have it repaired only by Dremel or by an authorised after-sales service centre using only original replacement parts. Damaged chargers, cables and plugs increase the risk of electric shock.
• Do not operate the charger on an easily ignited surface (e.g. paper, textiles, etc.) or in a flammable environment. There is a risk of fire due to the charger heating up during operation.

Products sold in GB only:
Your product is fitted with an 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 authorised 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.

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 grinding and deburring metal with corundum grinding tools, as well as for working with sanding belt tools, sanding with sanding discs and milling.
The power tool is additionally intended for brushing and polishing metal.
The battery charger is intended for charging the rechargeable Dremel Li-Ion batteries.

Product Features

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

1. Sleeve with integrated ring spanner
2. Spindle lock button
3. On/off switch
4. Speed preselection thumbwheel
5. Red LED indicator
6. Speed indicator
7. Battery charge indicator
8. Rechargeable battery^a)
9. Battery release button^a)
10. Hanger
11. Ventilation slots
12. Collet wrench
13. Shaft
14. Collet
15. Collet nut
16. Battery charger
17. Charging bay
18. Green battery charge indicator
19. Handle (insulated gripping surface)
20. Inner shank dimension L₀
21. Flexible shaft^a)

^a) This accessory is not part of the standard scope of delivery.

Technical Data

1. Depending on battery in use
2. Limited performance at temperatures < 0°C

Battery Charger	GAL 12V-20
Protection class	/II
Charging currentA	2.0 A
Battery charging voltage (automatic voltage detection)	3.6–12 V
WeightB	0.25 kg

1. Depends on temperature and rechargeable battery type
2. Weight without mains connection cable and without mains plug

Noise/Vibration Information

Noise emission values determined according to EN 60745-2-23.
Typically, the A-weighted sound pressure level of the power tool is less than 70 dB(A). The noise level when working can exceed the volume stated. Wear hearing protection!
Vibration total values a_h (triax vector sum) and uncertainty K determined according to EN 60745-2-23:
a_h = 5.6 m/s² K = 3.0 m/s²
The vibration level given in these instructions has been measured in accordance with a standardised measuring procedure and may be used to compare power tools. It can also be used for a preliminary estimation of exposure to vibration.
The stated vibration level applies to the main applications of the power tool. However, if the power tool is used for different applications, with different application tools or poorly maintained, the vibration level may differ. This can significantly increase the exposure to vibration over the total working period.
To estimate the exposure to vibration 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 can significantly reduce the exposure to vibration 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 application tools, keeping the hands warm, and organising workflows correctly.

Rechargeable battery

Dremel sells some cordless power tools without a rechargeable battery. You can tell whether a rechargeable battery is included with the power tool by looking at the packaging.

Charging the battery

• Use only the chargers listed in the technical data. Only these chargers are matched to the lithium-ion battery of your power tool.
  Note: Lithium-ion rechargeable batteries are supplied partially charged according to international transport regulations. To ensure full rechargeable battery capacity, fully charge the rechargeable battery before using your tool for the first time.

Inserting the Battery

Push the charged battery into the battery holder until it clicks into place.

Removing the Battery

To remove the rechargeable battery, press the battery release buttons and pull the battery out. Do not use force to do this.

Battery charge indicator

The battery charge indicator indicates the state of charge for a few seconds when the on/off switch is pressed halfway.

Temperature monitoring/overload protection indicator
The red LED indicator helps you to protect the rechargeable battery against overheating and the motor against overload.
If the LED indicator is lit up permanently in red, the temperature of the rechargeable battery is too high and the power tool switches off automatically.

• Switch the power tool off.
• Allow the battery to cool down before you carry on working.

If the LED indicator is flashing red, then the power tool is blocked and will switch off automatically.
Pull the power tool out of the workpiece.
The power tool will continue to work as soon as the blockage is rectified.

Recommendations for Optimal Handling of the Battery

Protect the battery against moisture and water.
Only store the battery within a temperature range of −20 to 50°C. Do not leave the battery in your car in the summer, for example.
A significantly reduced operating time after charging indicates that the battery has deteriorated and must be replaced. Follow the instructions on correct disposal.

Battery Charger

Charging process

• Check the mains voltage! The voltage of the power source must match the voltage specified on the rating plate of the charger.

Ensure that the charging bay and the battery contacts are free of coarse dirt. Ensure that the battery is fully inserted.
The charging process begins as soon as the mains plug for the charger is inserted into the mains socket and the battery is inserted into the charging bay.
The charging process is only possible when the temperature of the battery is within the permitted charging temperature range (0–45°C).
Thanks to the intelligent charging process, the state of charge of the battery is automatically detected and then charged up with the optimal charge current depending on battery temperature and voltage.
A significantly reduced operating time after charging indicates that the battery has deteriorated and must be replaced. When the charger is used continuously, or for several consecutive charge cycles without interruption, the charger may heat up. This is, however, harmless and does not indicate that the charger has a technical defect.

What the display elements mean

Flashing light battery charge indicator

The charging process is indicated by the flashing of the battery charge indicator.

Continuous light green battery charge indicator

A continuous light on the battery charge indicator signals that the battery is fully charged or that the temperature of the battery is not within the permitted charging temperature range (0–45°C), and can therefore not be charged. The battery charges as soon as the permitted charging temperature range is reached.
When there is no battery inserted, the continuous light of the battery charge indicator signals that the mains plug is plugged into the plug socket and that the charger is ready to be used.

Troubleshooting

Battery is not being charged

Battery is not being charged and the battery charge indicator is lit up continuously.

Cause: The charger has identified an internal error.
Corrective measure: Ensure that all batteries are fully inserted. Remove the mains plug and reinsert. If the error occurs again, have the charger checked by an authorised after-sales service centre for Dremel power tools.

Cause: Battery temperature is outside of the charging range
Corrective measure: Wait until the battery temperature is back within the permitted charging temperature range (0– 45°C).

Cause: Battery is not correctly inserted.
Corrective measure: Insert the battery into the charger correctly.

Cause: The battery contacts and charging contacts are dirty
Corrective measure: Pull out the mains plug and (dry) clean the battery contacts and charging contacts.

Cause: Battery defective
Corrective measure: Replace the battery.

Indicators do not light up

None of the indicators are lighting up, battery will not be charged.

Cause: Plug socket, mains cable or battery charger defective
Remedy: Make sure that the charger is connected to a suitable plug socket that works. If the error occurs again, it may be necessary to have the charger checked by an authorised after-sales service centre.

Cause: Mains plug of the battery charger is not (correctly) plugged in
Corrective measure: Plug the mains plug (fully) into the plug socket.

Fitting

• Before carrying out any work on the power tool (e.g. maintenance, tool change etc.), remove the battery from the power tool. There is risk of injury from unintentionally pressing the on/off switch.
• Use only original Dremel high-performance accessories that have been tested. Always read the instructions supplied with your Dremel accessory for further information about how to use the accessory. Handle and store the accessory parts carefully to prevent chips and cracks.

Fitting application tools

• When inserting an application tool, ensure that the shank of the application tool is firmly seated in the tool holder. When the shank of the application tool is not inserted deep enough in the tool holder, the application tool can become loose again and cannot be controlled. u Do not use application tools that are worn or in otherwise less than perfect condition. Defective application tools can break, for example, causing material damage and personal injury.
• Only use open-ended spanners that are suitable and undamaged (see "Technical Data").

Sleeve (1) with Integrated Ring Spanner (see figures A and C)
The sleeve (1) has an integrated ring spanner. This makes it possible to loosen and tighten the collet nut (15) without having to use the collet wrench (12).

• Loosen the sleeve(1) by turning it anticlockwise. Push the sleeve forwards over the collet nut (15). The sleeve (1) can now be used like a ring spanner.
• With the spindle lock(2) engaged, turn the sleeve (1) anticlockwise to loosen the collet nut (15).
• Push the shank of the application tool all the way into the collet(14).
• With the spindle lock(2) engaged, turn the sleeve (1) clockwise to tighten the collet nut (15).
• Once the collet nut(15) is fitted tightly, push the sleeve (1) back a little and screw it back tight again.

The grinding tools must run completely concentrically. Do not continue to use damaged grinding tools that are out of balance. If the grinding tools are out of balance, they should be replaced.

• Do not, under any circumstances, tighten the collet with the clamping nut until a grinding tool has been fitted. The collet may otherwise become damaged.
• Only use mounted points with an appropriate shank diameter. A mounting point with a shank diameter which does not correspond to the tool holder of the power tool (see "Technical data") cannot be held properly and will damage the collet chuck.
• The application tool must be clamped at least 10 mm. The inner shank dimension L₀ can be used to calculate the maximum permitted speed of the application tool from the specifications provided by the manufacturer of the application tool. It must not be less than the maximum speed of the power tool.

Dust/Chip Extraction

Dust from materials such as lead-containing coatings, some wood types, minerals and metal can be harmful to one's health. Touching or breathing-in the dust can cause allergic reactions and/or lead to respiratory infections of the user or bystanders.
Certain dust, such as oak or beech dust, is considered carcinogenic, especially in connection with wood-treatment additives (chromate, wood preservative). Materials containing asbestos may only be worked by specialists.

• Provide for good ventilation of the working place.
• It is recommended to wear a P2 filter-class respirator.

Observe the relevant regulations in your country for the materials to be worked.

• Avoid dust accumulation at the workplace. Dust can easily ignite.

Operation

Starting operation

• Check whether there is visible damage to the collet (14) and collet nut (15) before each use. u Always hold the power tool turned away from your face. Parts of damaged accessories may come loose when the power tool reaches high speeds. Detailed work can be carried out best if you hold the power tool as a pen between the thumb and index finger. For heavy work such as cutting or grinding, you can also use both hands to hold the power tool.

Switching On and Off
To start the power tool, slide the on/off switch (3) forwards. To switch off the power tool, push the on/off switch (3) backwards.

Soft start
The electronic soft start limits the torque when the power tool is switched on and increases the service life of the motor.

Setting the Speed
You can preselect the required speed using the speed preselection thumbwheel (4), even during operation.
The required speed depends on the material being worked and the diameter of the application tool. Observe the maximal allowable speed of the application tool.

^A) Wire brushes

When working with plastics and other materials with a low melting point, use low speeds.
Higher speeds are suitable for hardwoods, metals and glass, as well as for drilling, carving, cutting and routing.
When polishing, buffing and cleaning, work with speeds of up to max. 15000 min^-1 in order to avoid damaging the workpiece and application tool.
Aluminium, copper alloys, lead alloys, zinc alloys and tin can be machined at different speeds depending on the type of cutting.
Use paraffin (not water) or another suitable lubricant for the router bit to prevent the cut material from sticking to the router bit.
Notes: Do not increase the pressure on the workpiece. To achieve the required result, use a different speed. If the power tool starts to vibrate, it means it is running too slowly, so the speed must be increased.

Overload protection
When overloaded, the motor comes to a stop. Allow the power tool to cool down unloaded at its maximum no-load speed for approx. 30 seconds.

Practical advice

• Ensure that grinding tools and cutting discs are protected against impact when stored.
• Do not load the power tool so heavily that it comes to a stop.
• If the power tool has been subjected to a heavy load, continue to run it at no-load for several minutes to cool down the accessory.
• Grinding tools can become very hot while working. Do not touch them until they have cooled down.

First, carry out test work in order to get to know the power tool's behaviour better, particularly at high speeds. Lower the rotating application tool onto the work surface and allow it to touch the point at which you would like to start work. Move the application tool with light pressure to achieve an optimal work result. Too much pressure will reduce the performance of the power tool and lead to faster wear of the application tool.
Do not cover the ventilation slots with your hand when holding the power tool. Blocking the ventilation slots can cause the motor to overheat.

Hanger
You can use the hanger (10) to attach the power tool to a suitable suspension device.

Flexible Shaft (21) (see figure D)
A flex shaft (21) can be attached for precision work or hardto-reach places.
When using a new flex shaft (21) for the first time, hold the power tool in a vertical position for two minutes and run it at high speed.

Maintenance and Service

Maintenance and Cleaning

• Before carrying out any work on the power tool (e.g. maintenance, tool change etc.), remove the battery from the power tool. There is risk of injury from unintentionally pressing the on/off switch.
• To ensure safe and efficient operation, always keep the power tool and the ventilation slots clean.
  Clean the power tool at regular intervals using compressed air.

Transport

The contained lithium-ion batteries are subject to the Dangerous Goods Legislation requirements. The batteries are suitable for road-transport by the user without further restrictions.
When shipping by third parties (e.g.: by air transport or forwarding agency), special requirements on packaging and labelling must be observed. For preparation of the item being shipped, consulting an expert for hazardous material is required.
The recommended lithium-ion batteries are subject to legislation on the transport of dangerous goods. The user can transport the batteries by road without further requirements.
When the batteries are shipped by third parties (e.g. air transport or forwarding agency), special requirements on packaging and labelling (e.g. ADR regulations) must be met. A dangerous goods expert must be consulted when preparing the items for shipping.
Dispatch battery packs only when the housing is undamaged. Tape or mask off open contacts and pack up the battery in such a manner that it cannot move around in the packaging. Please also observe the possibility of more detailed national regulations.
Ship batteries only if the housing is undamaged. Package the battery in such a way that it does not move inside the package. Please take note of any further possible national regulations.