ROKTOOLS Notebook Type Surface Finish Comparator

           This is a visual and tactile, a comparative method to check the mechanical parts machined surface roughness of a measuring tool. By comparing the visual and magnifying mirror with the machined workpiece, the surface roughness level can be judged, which can provide guidance for designers on the intuitive sense and appearance features of the specific processing methods and roughness grades, and can also be used as the visual aids for mechanical majors in Colleges and universities These are often unsuitable for workshop use, where roughness of machined surfaces can usually be assessed conveniently and with sufficient reliability using visual and tactile (fingernail) comparison with a standard set of surfaces machined in the same way.

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