roughing


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roughing 

Grinding of the surface of a lens to the approximate curvature and thickness with a coarse abrasive. See blocking; smoothing; surfacing.
References in periodicals archive ?
Other manufacturers are also creating their own sets of plunger roughing tools or plungers.
Cleveland Twist Drill, and other tool manufacturers, have solved this problem by offering hard, wear-resistent titanium nitride (TiN) coatings applied by physical vapor deposition (PVD) on roughing end mills.
After a roughing end mill wears enough to affect performance, it can be resharpened by common cutter-grinding procedures.
Properly ground, a roughing end mill is equally efficient for conventional or climb cutting.
A more precise method of gaging the impact of wear on a roughing operation is to constantly monitor cutting force.
A successful application of roughing end mills comes from Southern Devices Div, Leviton Corp, West Jefferson, NC.
Typically, the surfaces are produced by making multiple roughing cuts, followed by a single finishing pass.