Frank COBRA C Operating Instructions Manual
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Frank COBRA C Operating Instructions Manual

Parquet floor sander with gentle lifting lever
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Operating instructions
Parquet floor sander COBRA C
with gentle lifting lever

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  • Page 1 Operating instructions Parquet floor sander COBRA C with gentle lifting lever...
  • Page 2 © 2006 Reproduction on whole or in part requires written permission from Hermann Frank GmbH & Co. KG, 75038 Oberderdingen, Germany. All rights reserved. No liability for any damage arising from the use of this brochure. Subject to alterations. Hermann Frank GmbH & Co. KG Östliche Bahnhofstraße 8...

  • Page 3: Operating Instructions

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever This brochure uses the 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...

  • Page 4: Table Of Contents

    Replacing the sanding belt ......................Adjusting the sanding pressure ..................... Safety instructions for electric cable and connectors ..............Connecting the COBRA C to the mains power ................Remarks about sanding parquet and plank floors ................. 7.10 Sanding with the COBRA C ......................
  • Page 5 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Parts lists............................Parts list of chassis ......................... Parts list of motor ..........................Accessories .............................

  • Page 6: Introduction

    Introduction Dear customer, you have decided in favour of the FRANK parquet floor sander COBRA C, the correct choice with respect to quality and performance. The COBRA C is the result of a consistent implementation of many years of experience.

  • Page 7: Scope Of Delivery

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Scope of delivery 1 guide tube 2 dust bag 3 cable with plug and coupling 4 lower part of the machine with motor 5 wing screws (2 pieces) 6 operating instructions...

  • Page 8: Machine Specifications Cobra C

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Machine specifications COBRA C Important components 1 pressure regulating screw 11 bumper wheel 2 castor wheels 12 belt guard 3 running wheels 13 motor 4 drum cover 14 switch box...

  • Page 9: Technical Data

    Proper use The parquet floor sander COBRA C is suitable for dry sanding of parquet and plank floors. No other use is allowed. Caution!

  • Page 10: Installing The Guide Tube

    Parquet floor sander COBRA C with gentle lifting lever Installing the guide tube Note: The COBRA C is delivered with the guide tube (1) removed. Caution! Injury to the operator or other persons could occur or damage could occur if the machine starts up unintentionally.

  • Page 11: Disassembling For Transport

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Disassembling for transport For easy transportation the motor and the guide tube can be removed. Removing the guide tube Caution! Injury to the operator or other persons could occur or damage could occur if the machine starts up unintentionally.

  • Page 12: Removing The Motor

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Removing the motor Caution! Injury to the operator or other persons could occur or damage could occur if the machine starts up unintentionally. Disconnect the machine from the power supply before working...
  • Page 13 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 6. Remove the knurled nut from the motor bracket. 7. Now you can remove the motor.

  • Page 14: Operating The Cobra C

    Protective clothing and equipment Caution! Wear hearing protectors! The supplied hearing protectors must be worn when using the machine. The following sound level values have been measured for the parquet floor sander COBRA C according to DIN 45 645: Idle mode...

  • Page 15: Fitting The Dust Bag

    Parquet floor sander COBRA C with gentle lifting lever Fitting the dust bag Caution! Only use original FRANK dust bags for the parquet floor sander COBRA C. Caution! The dust bag must be firmly fitted to the dust pipe before sanding. Instructions: 1.

  • Page 16: Safety Instructions Regarding Dust

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Safety instructions regarding dust Caution! Ultra-fine sanding dust! Always wear a respirator when sanding parquet and plank floors (is included with the accessories). When the machine is used for its proper purpose, the sanding of wooden floors naturally produces dust.

  • Page 17: Disposing Of Sanding Dust

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Disposing of sanding dust Caution! Fire risk! Because of the fire risk, the sanding dust contained in the dust bag must always be disposed of immediately every time after the machine has stopped and at the end of working.

  • Page 18: Replacing The Sanding Belt

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Replacing the sanding belt Caution! Danger from machine starting up! When replacing the sanding belt, there is a risk from the machine starting up unintentionally. Always disconnect the parquet floor sander from the mains power before working at the sanding belt.

  • Page 19: Adjusting The Sanding Pressure

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Adjusting the sanding pressure Use the pressure regulating screw to adjust the required sanding pressure. High sanding pressure: Turn the pressure regulating screw inwards as far as it will go.

  • Page 20: Safety Instructions For Electric Cable And Connectors

    Running over the electric cable with the sander entails a mortal risk from electric shock! Never point the machine towards the cable! Connecting the COBRA C to the mains power Caution! Avoid the risk of a serious accident from a fault current and use a portable RCD (Residual Current Protective Device).
  • Page 21 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Instructions for connecting to mains power: 1. Make sure that the switch (1) is in the off position. The machine must be switched off before connecting up to the mains power.

  • Page 22: Remarks About Sanding Parquet And Plank Floors

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Remarks about sanding parquet and plank floors Caution! Check the floor to see if any boards are loose. These must be fastened before sanding. Caution! Fire risk! If there are nails in the floor, they must be countersunk so low every time before sanding that there is no risk of hitting a nail while sanding.
  • Page 23 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Each sanding path corresponds to one forward and one backward movement. The backward movement covers the same path as the precede forward movement.
  • Page 24 Informations about the proper abrasive grits, sanding pressures and sanding directions for the several sanding procedures you will find in the brochure: Sanding parquet and plank floors with the FRANK parquet floor sander COBRA C and the FRANK edge sander GECKO S...

  • Page 25: Sanding With The Cobra C

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever 7.10 Sanding with COBRA C 1. Before starting the machine, the main lifting lever for the sanding drum (1) must be in the rear position. The sanding drum is clearly raised from the floor. The distance to the floor is approx.
  • Page 26 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 5. Before you lower the sanding drum to approx. 5 mm above the floor, you must pull the gentle lifting lever (2) up by bending the fingers of your right hand and hold in this position.
  • Page 27 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 8. Now start on sanding the first path by slowly lowering the gentle lifting lever (2) while you are moving the machine forward evenly, thus lowering the sanding drum to the floor.
  • Page 28 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 9. At the end of the forward movement, before the movement has finished, raise the sanding drum from the floor again by pulling the gentle lifting lever (2). 10. Every forward movement is followed by a backward movement. The backward movement covers the same path as the forward movement.
  • Page 29 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 11. Stopping or interrupting the sanding procedure: To stop or interrupt the sanding procedure, you must hold the gentle lifting lever (2) up with your right hand for as long as it takes for your left hand to move the main lifting lever (1) into the rear position and secure it here by turning the left handle (3).

  • Page 30: Maintenance

    The retaining nut is glued to the threads of the sanding drum shaft to ensure that it will not fall off while the COBRA C is in operation. To unscrew the retaining nut, use the double fork wrench that comes with the machine. Lower the sanding drum so it has contact with the floor...
  • Page 31 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 7. Lay the machine on its left side. 8. Press against the sanding drum carefully with a flat iron bar. 9. Remove the sanding drum out of the machine.

  • Page 32: Adjusting The Running Wheels

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Adjusting the running wheels If the machine only sands on one side, the surface setting must be adjusted. Following replacement of the sanding drum or running wheels, the surface setting must always be newly adjusted.
  • Page 33 Operating instructions Parquet floor sander COBRA C with gentle lifting lever 6. Adjust the right running wheel to the position of the left running wheel using the running wheel adjustment device. To accomplish this, turn the axle of the right running wheel with the hexagon socket screw key until the right running wheel slightly touches the tongue of the running wheel adjustment device.

  • Page 34: Adjusting The Castor Wheels

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Adjusting the castor wheels Instructions for adjusting the castor wheels: 1. Turn the machine off. 2. Disconnect the machine from the mains power. 3. Loosen the lock nut (1).

  • Page 35: Adjusting The Tension Roller

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Adjusting the tension roller The tension roller keeps automatically the track of the sanding belt concentrically to the sanding drum. If with time the sanding belt fails to run concentrically to the sanding drum, the tension roller must be newly adjusted.

  • Page 36: Tightening The V-Belts

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Tightening the V-belts If the V-belt tension has eased, adjustment must be made to achieve the proper tension. Whining or screeching are indications of insufficient V-belt tension. Instructions for tightening slack V-belts: 1.

  • Page 37: Parts Lists

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Parts lists Parts list of chassis Quantity Part No. Article No. Designation per machine 1,00 370001000 machine housing 3,00 370003000 guide tube support 3,01 912008025 screws 3,02 679808000 serrated washers...
  • Page 38 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Quantity Part No. Article No. Designation per machine 15,01 370015010 sliding plate 15,02 934016000 lock nut 15,04 310015040 external roller 15,05 620202000 ball bearings 15,06 912006012 screw 15,07 310015070...
  • Page 39 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Quantity Part No. Article No. Designation per machine 38,05 679808000 serrrated washer 38,06 912008016 screw 39,00 270039000 cable arm bracket 39,01 799106016 screws 39,02 912008030 screw 39,03 016012225 pressure spring...
  • Page 40 Operating instructions Parquet floor sander COBRA C with gentle lifting lever Quantity Part No. Article No. Designation per machine 58,00 270058059 castor wheel felloes 58,01 620201000 ball bearings 58,02 270058259 tyres 58,03 270058359 felloe covers 58,04 963005016 screws 58,05 679808000...

  • Page 42: Parts List Of Motor

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Parts list of motor Single phase AC motor 230 V, 50 cps, 2500 W: Quantity Part No. Article No. Designation per machine 75,00 375075230 stator 75,01 375081100 left motor foot...

  • Page 44: Accessories

    Operating instructions Parquet floor sander COBRA C with gentle lifting lever Accessories Part No. Article No. Designation 270099000 dust bag 150102100 Multiclip 374179325 cable with plug and coupling 370106000 operating instructions 370063059 running wheel adjusting tool 270102000 tool pouch, empty...

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