Roughness Comparison Specimens

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.

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. A new range of Roughness Comparison Specimens from Paul N. Gardner Co. is intended for just this purpose. The specimens are simple to use and inexpensive, and can be used for a variety of applications including checking roughness of turned, milled, ground, reamed, polished or lapped parts during machining, checking the roughness of steel surfaces which have been prepared for painting by blast-cleaning, as outlined in ISO 8503, and checking the seriousness of damage to parts caused by nicks, dents and scratches.