30pcs Roughness Comparator Notebook Package Standards sets

Application: 

• Checking roughness of turned, milled, ground, reamed, polished or lapped parts during machining
• Checking the roughness of spark-eroded surfaces as described in the VDI 3400 Guideline
• Checking the roughness of steel surfaces which have been prepared for painting by blast-cleaning, as outlined in ISO 8503
• Estimating surface roughness prior to accurate measurement by a stylus instrument, as recommended
  in BS EN ISO 4288, eg.
• Checking the seriousness of damage to parts caused by nicks, dents and scratches
• Checking reconditioned ship propeller blades
• Made from 100% Nickel

Including:

6 turned, 6 end-milled, 6 horizontally milled, 6 surface-ground, 3 lapped, 3 reamed/drilled. A label gives the Ra and Rz values of each specimen in both metric and imperial units