Safty in Use of Coated Abrasives

The recommendations of  this document are only a summary of  the most  important  precautions. All users must strictly follow the safety  instructions  existing in the laws, decrees and technical  standards of  their country and in machine instructions.

Contents
A. General Safety Recommendations
A.1 Transport and Storage
A.2 Personal Protection
A.3 General Precautions
B. Safety Recommendations according to product type
B.1 Vulcanised fibre discs
B.2 Flap discs
B.3 Flange  mounted  flapwheels in coated abrasive and non-woven material
B.4 Belts
B.5 Paper, cloth and combination discs and of sheets for orbital and dual action sanders
B.6 Spirally wound bands and sleeves
B.7 Spindle mounted flap  wheels  made  of  coated  abrasives  and  non woven abrasives

A. General Safety Recommendations
A.1 Transport and storage
     All  coated  abrasives should  be  handled  carefully. Mechanical  damage canbe caused  by  mishandling,which should beavoided.Coated abrasives should be stored in dry,frost free conditions. They should  be  kept away  from  heat  sources, cold, damp  walls, doors or windows and should  not be in direct  contact with  the  floor. Temperatures and humdity should  be  between 18-22 °C  and  45%-65%  Relative  Humidity. Coated  abrasives should  not be  exposed  to direct  sunlight.  Products  should be kept in their original packaging until  immediately before use.Once  unpacked, they should be stored in a way which avoids distortion.

A.2 Personal protection

      Safety  goggles, ear muffs, safety  gloves, dust  masks  and,   if  grinding  conditions  are  severe,
additional  face  protection, leather aprons  and  safety  shoes   must  be  worn.

A.3 General precautions

    Safety instructions provided by the machine manufactures  must  be  followed. Where  fitted  all guards,covers and hoods  must  be  in  place on  the  machine during  grinding, and  should not be modified  in  any  way. Coated  abrasives  should  not  be  used  near  inflammable  material or  in an environment where there is a risk of explosion. Sparks should  be directed away  from the face  and body and if possible towards the floor.Dust extraction equipment  must  be used  whenever it is available. The instructions for use given by  the abrasive  manufacturer  must  be   followed  : eg.  "Not to be used without a support" , or "Not to be  used  for  wet  grinding".The  workpiece must  be  firmly  fixed  before  grinding  starts. Check all abrasives  visually before use and make certain  that the  product  is  suitable for  the application. No  modifications  should  be  made to  abrasive products after delivery.When using a portable grinder always switch it off and allow the spindle to  stop  completely  before  putting  the  tool  down. Wet  grinding  should  only  be  carried  out  on  
machines designed for this purpose and with abrasives designated as suitable for this type of operation.

B. Safety recommendations according to product type
B.1 Vulcanised fibre discs
B.1.1 Preparation before use
     Fibre discs  must  be used  with  a back-up  pad of  the correct  size. Do  not  use  other  fibre discs as a back-up pad. The diameter of the disc must be at least 3  mm  but  not more than 15mm greater than the diameter of the back-up pad.Do not use a fibre  disc  which  is  damaged  in any  way. Always  check  visually for  damage  before  use. Make   certain  that  both the disc  and  the back-up pad are fitted correctly to the machine spindle. The maximum peripheral operating speed of a fibre disc is 80 m/s.The maximum operating speed in rpm appears on the packaging.In  no circumstances  should  the speeds be exceeded.The spindle speed of the machine must never exceed the maximum operating speed of  the disc.Spindle speeds in  rpm  corresponding to 80 m/s for different  disc diameters are given below  following  the formula

Personal protection

     Safety goggles ,ear  muffs, safety gloves , dust masks and ,if grinding conditions are severe,ditional  face protection, leather aprons and safety shoes must be worn.

B.1.2 Grinding operation
    The fibre disc should  only  be  brought    into contact  with  the  workpiece  when  the  machine  
is  running  at its  operational speed.The disc should be applied  to the  workpiece at the shallo-west  angle possible - about 10  degrees  is  recommended.Grind 'off' an edge rather than 'into' it when grinding rough welds or metal edges. Do not attempt to use a fibre disc for slot grinding,cutting-off or wet grinding.After use the angle grinder should be stored with care.The  face of  the disc   must  not  be  in contact with bench or floor.

B.1.3 Storage
     Vulcanised fibre discs should be stored at a temperature of 18-22 °C and 45%-60%  Relative  Humidity. Further general  safety recommendations for the transportation and storage should be observed .

B.2 Flap discs
B.2.1 Preparation before use
        Damaged, misshapen or modified  flap discs and  support pads,if needed, should not be used. Always use a support pad if specified by the manufacturer.Always ensure that the flap disc and the support pad are safely and centrally fixed to the  machine spindle. Do not use  a  flap disc  with  an oversize or undersize bore.The maximum peripheral operation speed  and  the maximum rpm of  a flap disc should not be exceeded.The spindle speed of  the machine in rpm must be equal to or less  than the maximum operating speed shown on the flap disc.

Personal protection

     Safety goggles,ear muffs,safety gloves,dust masks and if grinding conditions are severe, additional face protection,leather aprons and safety shoes must be worn.

B.2.2 Grinding

      The flap disc should only be brought into contact with the work,when the machine is running at its operational speed.Apply the flap disc to the work at the shallowest  angle  possible.About 10  degrees is recommended.Grind 'off' an edge rather than 'into' it when grinding rough-welds or  metal edges.Do not attempt to use a flap disc for slot grinding,cutting-off or wet grinding.After use the angle grinder should be stored with care.The face of the flap disc must not be in contact with bench or floor.

B.3 Flange mounted flapwheels of  coated  abrasives  and  nonwoven  material
B.3.1 Preparation  before  use  Flanged  flapwheels  of  either  coated  or  non-woven  abrasives must  be only  used on  this  purpose. Always  use  the mounting flanges supplied by the machines  specifically manufactured  for wheel manufacturer. Ensure that  the wheels are mounted strictly in   accordance with the  manufacturer's  instructions.Ensure  that  the wheel is centrally and securely  mounted on the machine and that the wheel runs in the direction lof the directiona  arrow marked on it .Check that the maximum operating speed of  the wheel given in RPM is higher thanor equal to  the spindle speed of the  machine. Never exceed the maximum operating  speed recomrnended by the manufacturer.

Personal protection
      Safety goggles,ear muffs,safety gloves,dust masks and,if grinding conditions are severe, additional  face protection,leather aprons and safety shoes must be worn.

B.3.2 Grinding

     When using  non-woven  flap wheels dust  extraction equipment  should   always  be  used.If  the
wheel has been used for grinding wet, run the machine up to speed  progressively.Only bring the flap wheel  into contact with the work when the spindle is " up  to  speed ".When finishing a wet grinding operation turn off the coolant feed and allow the flapwheel  to  run until  no further coolant is ejected.

B.3.3 Storage

    Flapwheels should be stored in accordance with the recommendations given in chapter 1 and be  stored flat or hung by their spindles to avoid permanent deformation.

B.4 Belts

B.4.1 Preparation before use

     Check belts before use for tears and holes.This is particularly important for belts which have been partly used or left on a machine for any length of time,eg overnight.On removal   from their packaging belts should be preconditioned  by  hanging them over a rod or peg of  not  less than50 mm diameter at the temperature and humidity levels given on page 2.They must not  be hung from a nail as this may cause cracking and failure.Run lap jointed belts in the direction indicated by  the  arrow.Do not use belts  which  have  been  modified  in  any  way  after delivery  Keep contact  wheels, platens, idler  pulleys , etc  in good condition.Never run belts on  damaged  or faulty support devices.Only carry out wet grinding operations   with belts specifically designated as suitable for this.Belts wider than 50 mm should only  be   mounted  on  machines guarded  in such  a  way that only the working area of the belt is visible.Always  release the  belt  tensioning device  when  installing  the belt.Never leave belts under tension on a stationary machine.

Personal protection

     Dust masks should be worn together with protection for the eyes and ears.Additional protection
such  as safety gloves, safety shoes,and leather aprons is also recommended.

B.4.2 Grinding

    Start grinding only when the belt is correctly tensioned and the machine is 'up to speed'.Avoid  grinding with the edge of  the belt wherever possible on off  hand  applications.Use the center of  the  belt  if  possible.' Slack of  the belt' grinding must only  be carried out on machines designed  for  this purpose and which  incorporate  adequate  guarding.Ensure that  the belt  is adequately  guarded when starting up,  adjusting and running. Do not attempt  to stop the belt when  it  is in contact with the work.When finishing a wet grinding operation turn off the supply of coolant and  allow the belt  to run until all the coolant has been ejected  before stopping it.No attempt should be made  to remove a belt  from a machine when it is running.Do not  leave the belt under tension when grinding is finished.

B.5 Paper,cloth,and combination discs for orbital and dual action sanders

B.5.1 Preparation for use
      Discs and sheets must only be used on  machines equipped with a  suitable support pad.In the case of discs the maximum operating speed indicated on the back-up pad  must  not be exceeded. Discs and sheets should be  used  only on  machines  with  a  suitable  support  pad  Damaged  or misshapen discs or support  pads  should  not  be  used.Discs  and pads must  not be  modified  in  any way.Take care to fix the disc securely and centrally to the back-up pad.The diameter of the disc must be greater,but not more than 4 mm,than the diameter of  the back-up pad, that is to say a maximum overhang of 2mm.When using self adhesive or  'Velcro' backed  discs or sheets ensure  that the face of the back-up pad and the back of the disc are clean and dry.

Personal Protection

      Dust masks should be worn together with protection for the eyes and ears.

B.5.2 Grinding

      Only start to grind when the machine is 'up to speed', except on  pneumatic random  orbital  machines which must be started with light pressure on the disc.The machine should be operated with the disc making the smallest possible angle to the workpiece.Use only light pressure at  first when grinding with 'Velcro'or self-adhesive backed discs or sheets.Do not allow overheating of the disc or sheet to occur.Grind 'off' an edge rather than 'into' it when grinding rough welds or edges. Do not attempt to use discs for slot grinding or cutting off.Only carry out wet grinding operations with machines and discs or sheets specifically designated as suitable for this.After use the machine should be stored carefully.The face of the abrasive should not be in contact with the floor or work bench.

B.6. Spirally wound bands and sleeves

B.6.1 Preparation for use

       Ensure that the band /sleeve diameter matches that of the support wheel or mandrel,and that  the  support wheels and mandrels are in good condition,free of damage.Ensure that  the bands and  sleeves have not been modified in any way.Ensure that the bands and sleeves are fitted centrally and securely to  the machine.Do not run bands and sleeves at a peripheral speed higher than that recommended by the manufacturer.

Personal protection

       Safety goggles, ear  muffs, safety  gloves, dust masks and, if  grinding  conditions  are  severe, additional face protection, leather aprons and safety shoes must be worn.

B.6.2 Grinding

       Do not start grinding until the machine is 'up to speed'.When grinding sharp edges and outlines,  grind 'off'  the   edge rather  than  'into'  it. To prevent  the band or   sleeve  becoming  loose on  the 
mandrel  do  not  use  excessive  pressure when grinding.

B.7 Spindle mounted products

B.7.1 Preparation for use

        Ensure that the spindle is correctly centred in  the chuck or collet, is fixed securely, and that  the wheel rotates in the direction indicated.Do not allow the mounted wheel to run at a speed  higher than that recommended by the manufacturer.The spindle speed in rpm must never exceed that specified for the wheel.

Personal protection

       Safety goggles,ear muffs,safety gloves,dust masks and, if grinding conditions are severe, additional  face  protection, leather aprons  and safety shoes must be worn.

B.7.2 Grinding

         Do not put the mounted wheel in contact with the  work until   the wheel  is  'up to speed'. Grind 'off' an edge rather than 'into' it when grinding rough welds or edges.To prevent the  spindle  becoming  loose in the chuck or collet do not use excessive pressure when grinding.

shandong dragon abrasives enterprise group co.,ltd.
rizhao branch:rizhao flotta hardware and mill tools co.ltd
add: No.138,northern of zhengzhou road,rizhao,shandong,china
tel: 86-633-8332928  fax: 86-633-8352255
Email:sales@dragonabrasives.com
http://www.dragonabrasives.com