Some drillers claim that such spiral ridges are formed whe, английский Bit and drill stem chatter or vibrate or when the bit has been overfed. 2. one of a series of short, curved gouge marks on a glaciated rock surface. check. 1. to stop or slow down. 2. to inspect for structural or dimensional imperfec tions; to examine. 3. sometimes used as a synonym for check valve.
