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This allows the use of other approaches and also some of the new application-specific plunge roughing tools, which require a short forward step (for example, 20% of the tool diameter).
The restriction problem is sometimes dealt with by providing a secondary line and valve so that the roughing can be carried out through the turbo or drag pump and the secondary line at the same time in a bypass mode.
Additional cost savings are achieved by reducing operator downtime to change spent wheels as well as to change between roughing and finishing wheels.