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FAQ

About Grinding Wheel

  • Do grinding wheels have an expiration date?
  • There is no particular expiration date, however we recommend you use our wheels within 5years after production date because the wheels will deteriorate when exposed to moisture.
  • What is the difference between grain type of A and A/WA?
  • A and A/WA denotes the type of abrasive grain; A type wheel is made of brown fused alumina (alundum), A/WA type wheel is made of mixture of brown and white alumina (white alundum). Both type of wheels are suitable for grinding carbon steels.
    A/WA type wheel is mixed white alundum for increasing grinding performance. If more stronger grinding force is needed for your application, we recommend you to select A/WA type wheel. Incidentally, WA type wheels are suitable for grinding stainless steels.
  • Is there any effective way to increase the life of grinding wheels?
  • Using grinding wheels with low angle results in abnormal abrasion or loading and decrease the life of grinding wheel.
    Using grinding wheels with proper angle 15-30 degree helps prevent abnormal abrasion, providing smooth grinding and polishing. Dressing for grinding wheels with metal piece breaks away dull abrasive grains and restore its effectiveness.
  • How to select grinding wheels hardness?
  • Hardness is rated from A-Z with 'A' being the weakest and 'Z' being the strongest bond. Standard hardness is 'P' ( 'Q' is standard for "Green Z").
    We recommend you to select P (or Q) for normal use. If you focus on grinding force more than durability, then you can select softer wheels. Conversely harder wheels last longer than softer wheels.
  • Does finished surface vary with the different grit?
  • The lower the number, the coarser the grain, the finished surface is rough. The higher the number, the finer the grain, the finished surface is smooth.
    Applications: #24/36 for heavy or normal grinding, #46-100 for sanding or polishing, up to #120 for polishing or finishing.