for cutting grooves, e.g. oil grooves of helicoidal shape

Full Title

Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor > for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes > for turning helical or spiral surfaces > for cutting grooves, e.g. oil grooves of helicoidal shape

Classification Context

Section:

PERFORMING OPERATIONS; TRANSPORTING

Class:

MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR

Subclass:

TURNING; BORING