WOLFF | A Brand of UFLOOR Systems Operating instructions Parquet sanding machine Cobra 2.5 kW(3,2kW)/50 Hz Item no. 052549 + 052551 + 054720 + 054891 Item no. 054004 WOLFF | A Brand of UFLOOR Systems | 71665 Vaihingen/Enz | Dieselstraße 19 | Tel. +49 (0)70 42 95 11- 0 | Fax +49 (0)70 42 95 11- 44 | E-mail info@ufloor-systems.com | Internet www.wolff-tools.
© 2009 All rights reserved. Reproduction in whole or in parts requires written permission from Hermann FRANK GmbH & Co. KG, 75038 Oberderdingen, Germany. No liability for any damage arising from the use of this brochure. Subject to alterations. Hermann FRANK GmbH & Co. KG Östliche Bahnhofstr. 8 75038 Oberderdingen Germany Tel.: +49 (0)72 58 / 60 88-0 Fax: +49 (0)72 58 / 60 88-11 E-mail: info@hermannfrank.de www.hermannfrank.
This brochure uses the following symbol to mark important instructions for safety and preventing damage: Please give special attention to the marked instructions. They refer to a potentially dangerous situation. Failure to comply can result in fatal or severe injuries and damage to property.
Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3 Description of the parquet sanding machine Cobra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 3.1 3.2 3.3 Important components . . . . . . .
1 Introduction Dear customer: Congratulations on purchasing the FRANK parquet sanding machine Cobra, the correct choice with respect to quality and performance. The Cobra is the result of a consistent implementation of many years of experience. This machine combines extraordinary high sanding performance and excellent sanding quality with easy to operate, proven and reliable technology. These operating instructions contain important information for the use and safe operation of the Cobra.
2 Scope of delivery 1 1. Machine 2. PUR cable with plug and coupling 3. Dust mask 4. Operating instructions 5. Allen keys 5 mm, 6 mm, 10 mm 6. Running wheel adjustment gauge 7. Tool bag 8. Fixed spanners 10 mm, 13 mm, 17 mm, 30/36 mm 9. Hearing protection Not shown: 2 dust bags Not shown: Abrasive belts (10 pcs.
3 Description of the parquet sanding machine Cobra 3.
3.2 Technical data Single-phase AC motor . . . . . . . . . . . . . . . . . . . . 230 V (240 V), 50 Hz Motor capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 kW (3,2 kW) Roller speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,100 rpm Sanding width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mm Abrasive belt dimensions. . . . . . . . . . . . . . 200 mm x 750 mm, endless Weight: Handle compl. . . . . . . . . . . . .
5 Starting the machine 5.1 Mounting the handle Note! The Cobra is delivered with handle and dust pipe dismantled. Caution! There is the risk of injury or damage caused by an unintentional starting of the machine. Disconnect the machine from the mains supply before working on the machine! 5 3 6 1 4 2 1 How to mount the handle: 1. Insert the bottom part of the connecting rod through the slot of the handle mount. Make sure that the fixing studs ( 1 ) are inserted into the positioning holes ( 2 ).
5.1.1 Adjusting the handle height 1. Lower the main lifting lever ( 1 ) to the front. 2. Slide the clamp sleeve ( 2 ) to the top and take apart the connecting rod ( 3 ). 3. Loosen the clamp bolt ( 4 ). 4. Pull the locking stud ( 5 ) and have it snapped in at the desired position. 5. Assemble the connecting rod ( 3 ) on this position. 1 5 4 3 2 5.2 Mounting the dust pipe 1 2 Insert the dust pipe ( 1 ) into the pipe connection ( 2 ) while gently rotating it. It is sealed with 2 O-rings.
5.3 Mounting the motor The machine is delivered with the motor already mounted. Due to reasons of weight, it may however be necessary to remove the motor to transport the machine (see chapter 6.2, Removing the motor, on page 17). Before placing the motor onto the machine, make sure the catch ( 1 ) is in the open position. When the motor is placed correctly, lock the catch ( 1 ) to fix the motor.
5.4 Installing the belt 1. Swing out the lever ( 4 ) and lift the belt tensioner ( 2 ) until the locking stud ( 3 ) unlatches. 2. Insert the belt ( 1 ) around the belt pulleys and deflection roller as shown in the figure. 3. Slightly lift the belt tensioner ( 2 ) and pull back the locking stud ( 3 ). 4. Lower the belt tensioner to take up belt slack. 5. Pull the lever ( 4 ) and fold it in.
5.5 Mounting the dust bag Caution! Only use original FRANK dust bags for the parquet floor sanding machine Cobra. Caution! Make sure the dust bag is fitted securely to the dust pipe before sanding. How to install the dust bag: 1. Pull the outer bag over the dust pipe behind the pipe reinforcement ( 1 ). Lace up the cords carefully. 2. Open the zipper of the dust bag. Insert the disposable inlay into the outer bag and tighten it around the dust pipe ring ( 2 ). Lace up the inlay bag. 3. Close the zipper.
5.6 Adjusting the wall bumper wheels 1 1 1. Loosen the bolts ( 1 ) to slacken the mounts. 2. The wheels can be screwed in or out by rotating them to adjust them to the proper wall distance. The wheels must be positioned horizontally to the floor. 3. After adjusting the wheels tighten the bolts again.
5.7 Connecting the Cobra to the mains supply How to connect the machine to the mains supply: 1. Make sure that the switch ( 1 ) is in the off position. The machine must be switched off before connecting it to the mains supply. 2. The main lifting lever for the sanding roller ( 2 ) must be folded backward so that the sanding roller is raised from the floor. 3. Hang the pivoting cable arm into the left or right cable arm bracket as required.
6 Disassembling for transportation For easier transportation, the handle, the dust pipe, and the motor can be removed. 6.1 Removing the handle There is the risk of injury or damage caused by an unintentional starting of the machine. Disconnect the machine from the mains supply before working on the machine! How to remove the handle: 1. Disconnect the motor and lamp couplings. 2. Fold down the cable arm ( 1 ). 3.
6.2 Removing the motor There is the risk of injury or damage caused by an unintentional starting of the machine. Disconnect the machine from the mains supply before working on the machine! How to remove the motor: 1. Make sure that the motor switch is in the off position and that the power cable is disconnected from the motor plug. 2. Unscrew the bolt ( 1 ) from the belt cover and open the cover. 3. Slacken the belt by raising the belt tensioner ( 2 ) until the locking stud ( 3 ) unlatches. 4.
6.3 Transporting the machine To carry the machine, use the two carrying bars at the front ( 1 ) and back ( 2 ). The front carrying bar ( 1 ) can be folded up. The transport plate is recommended for transporting the machine. When the machine is placed on the transport plate, the sanding roller and the castors are unloaded. Accessory: Transport plate, item no.
7 Operating the Cobra 7.1 Proper clothing and equipment Caution! Wear hearing protectors! Wear hearing protection when operating the parquet sanding machine Cobra. Wear the ear muffs supplied as accessory with the machine. The following sound level values were measured for the parquet sanding machine Cobra according to DIN 45645: Idle mode LEQ = 84 dB (A) Working mode LEQ = 85 dB (A) The noise which the machine emits when working depends on various factors.
7.2 Safety instructions regarding dust Caution! Ultra-fine sanding dust! Wear a dust mask when sanding woodfloor or floorboard flooring. A dust mask is supplied as accessory with the machine. When the machine is used for its proper purpose, the sanding of wooden floors naturally produces dust. The machine is equipped with an integrated dust absorption system to blow the dust into the dust bag. The dust is collected in the dust bag.
7.3 Disposal of sanding dust Caution! Risk of fire! Because of the fire risk, the sanding dust contained in the dust bag must always be disposed of immediately every time the machine stops or when sanding is completed. The sanding dust must be disposed of in a fireproof, non-flammable container. The container must be covered with a fireproof, non-flammable lid. Store the container only outdoors. Caution! When a third of the dust bag is filled with sanding dust at the latest, empty the dust bag.
7.4 Replacing the abrasive belt Caution! Risk of injury if the machine starts unintentionally! When replacing the abrasive belt, there is a risk of starting the machine unintentionally. Unplug the machine from the mains supply before working on the abrasive belt. Caution! Risk of cutting your hands! The sanding grains of the abrasive belt have sharp edges. Always wear safety gloves when replacing the abrasive belt. How to replace the abrasive belt: 1. Switch off the machine. 2.
7.5 Adjusting the sanding pressure Use the sanding pressure regulator ( 1 ) to adjust the required sanding pressure. 1. Fold the main lifting lever ( 2 ) to the top. 2. Pull the sanding pressure regulator ( 1 ) to the top and rotate it to the desired position ( 3 ). 3. Release it on the desired position.
7.6 Safety instructions for electric cable and connectors Caution! Danger of death from electric shock! Danger of death from electric shock if the electric cable or connectors are damaged. Damaged cables or connectors have to be replaced by a qualified electrician.
7.7 Remarks about sanding woodfloor and floorboard floors Caution! Check the floor for loose boards. They must be fastened before sanding. Caution! Risk of fire! If the floor is installed with nails, make sure that they are countersunk deep enough to avoid a grinding of the nails before you start sanding. Hitting a nail while sanding may produce sparks and cause a fire. A spark in the dust bag, for example, can cause a fire. Floors are sanded in sanding lanes which overlap each other from left to right.
Each sanding lane corresponds to one forward and one backward sanding without offsetting the backward sanding lane.
Due to the space needed for the machine operator and the machine itself, the area of approximately 1.5 m to the wall behind the sander will not be sanded. Turn the machine 180° and sand the remaining area of the floor. Again sand in overlapping lanes from left to right. Pay attention to a shoulderfree transition to the area already sanded. Note! To obtain a nice surface of the floor, several sanding rounds are required in general.
7.8 Switching on/off the Cobra with the cockpit control panel 1. Before starting the machine, make sure that the main lifting lever for the sanding roller ( 1 ) is in the rear position. The sanding roller is clearly raised from the floor. The distance to the floor is about 15 mm. The voltmeter ( 5 ) indicates the existing voltage. 2. Before starting the machine, make sure that the abrasive belt is tightened. 3. Turn the switch ( 4 ) to level 1. When the motor has ramped up, switch to level 2.
7.9 Sanding with the Cobra 1 1. Before starting the machine, make sure that the main lifting lever for the sanding roller ( 1 ) is in the rear position. The sanding roller is clearly raised from the floor. The distance to the floor is approx. 15 mm. 2. Move the machine to the start position.
1 2 3. Before you lower the sanding roller to approx. 5 mm above the floor, pull the soft lowering lever ( 2 ) with your right hand and keep it in this position. 4. While holding the soft lowering lever ( 2 ), push the main lifting lever ( 1 ) forward with your left hand. This lowers the sanding roller to approx. 5 mm above the floor. It is absolutely mandatory to keep the soft lowering lever ( 2 ) in the top position. Otherwise, the sanding roller would be lowered onto the floor.
2 5. To start sanding the first lane, constantly push forward the machine and slowly lower the soft lowering lever ( 2 ) to lower the sanding roller onto the floor. Caution! Move the machine at an even pace while sanding to avoid dents sanded into the floor.
2 6. Before stopping the machine at the end of the forward movement, pull the soft lowering lever ( 2 ) to lift the sanding roller from the floor. 7. Every forward sanding is followed by a backward sanding in the same lane. For the next forward sanding, offset the machine about 10 cm to the right. Caution! In no event shall the machine come to a standstill while sanding, not even for a short moment as this would sand a dent into the floor.
1 2 8. How to finish or interrupt a sanding round: To finish or interrupt a sanding round, pull the soft lowering lever ( 2 ) with your right hand and keep it in this position until you moved the main lifting lever ( 1 ) into the rear position with your left hand. Now, you can release the soft lowering lever ( 2 ). Switch off the machine and unplug the cable from the mains supply. Protect the machine against inadvertent rolling away.
8 Maintenance 8.1 Replacing the sanding roller If the surface of the sanding roller is damaged or worn, the roller must be replaced. How to replace the sanding roller: 2 3 1 4 1. Switch off the machine. 2. Unplug the power cable from the mains supply. 3. Open the roller cover ( 1 ). 4. Fold the tension lever ( 2 ) to the front to slacken the abrasive belt. 5. Pull out the abrasive belt ( 3 ) to the side. 6.
7. Lay the machine on its left side. 8. Use a pry bar to gently raise the sanding roller. 9. Take out the sanding roller. 10. Be careful not to loose the parallel key. 11. Slide a new sanding roller onto the sanding roller shaft. The parallel key must properly fit into the slot in the sanding roller shaft. 12. Apply metal adhesive to the retaining nut thread and bolt the nut onto the sanding roller shaft. Securely tighten the retaining nut with the delivered double-headed fixed spanner.
8.2 Adjusting the running wheels If the machine produces a slanted sanding, the planar setting has to be adjusted. After replacing the sanding roller or the running wheels, the planar setting always has to be readjusted. For an exact planar sanding, the sanding roller and the running wheels must be flush. The right running wheel is adjustable. The left wheel does not adjust. 2 3 1 4 How to adjust the running wheels: 1. Switch off the machine. 2. Unplug the power cable from the mains supply. 3.
6. Use the running wheel adjustment gauge to adjust the right running wheel ( 3 ) to the position of the left running wheel ( 1 ). Turn the star-shaped knob of the right running wheel ( 3 ) until the right running wheel ( 3 ) slightly touches the bar of the running wheel adjustment gauge ( 4 ). 7. Tighten the lock nut ( 2 ) of the star-shaped knob on the running gear lever beside the right running wheel. 3 4 8.3 1 Adjusting the castors How to adjust the castors: 1 37 1. Switch off the machine. 2.
8.4 Adjusting the tension roller The tension roller automatically controls the abrasive belt to ensure that the belt runs centrically on the sanding roller. If the automatic centering control deteriorates in the course of operation, the tension roller has to be readjusted.
8.5 Replacing the lamp 1. Remove the socket from the lamp ( 3 ) by twisting it a quarter turn to the left. 2. Unscrew the knurled bolt ( 2 ) until you can fold up the clamping bracket ( 1 ). 3. The installation of a new lamp is in reverse order. 3 9. 1 2 Declaration of conformity Herewith, we declare in sole responsibility that this product complies with the following standards and normative documents: EN 50144, in accordance with the regulations of the Directives 73/23/EEC, 89/336/EEC, 98/37/EC.
10. Warranty The warranty period for new FRANK machines is one year from delivery to customer, unless valid legal regulations call for a different warranty period. When asserting warranty claims, the invoice and/or proof of purchase shall be submitted. All repairs covered by warranty shall be carried out by a FRANK authorised service shop. Repairs carried out by the customer and/or in an improper manner will void any warranty claims. Improper operation and/or use will also void warranty.
