R & W
An assessment of roughness and waviness components of a profile based upon surface characterisation by the Motif Method. See ISO 12085. This method of roughness and waviness calculation was developed by the French automotive industry.
Raw Profile
A display of the surface without any filtering or form removal applied. Usually the measured data prior to analysis.
Ring gauge circle
See “Minimum Circumscribed Circle”
Roughness
This is usually the process marks or witness marks produced by the action of the cutting tool or machining process, but may include other factors such as the structure of the material.
Roughness Filter
Selecting a roughness filter will remove waviness elements, leaving the roughness profile for evaluation.
Run-up Length
The amount of travel allowed for a traverse mechanism to stabilise before data collection begins. Most measuring instruments also have a run down length
Runout
Runout is a useful parameter in that it combines the effect of form error and concentricity to give a predicted performance when rotated about a datum.
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