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30 classic special-shaped parts machining principles-2

21.Drilling hexagon holes 1a

The Lullo pentagon rotates within a hexagon. The trajectories of the pentagon at different points are shown. The red track is part of the hexagonal hole drilled. Its corners are round. Hexagonal inner round holes must be drilled in advance.

22.Drilling hexagon holes 1b

Rounded hex hole drilling mechanism based on “drilling hex hole 1a”.

23.Drilling square holes 2a

A Rullo trigon rotates within a square. The trajectories of the different points in the triangle are shown. The red track is part of the square hole drilled. Its horns are sharp. The inner circular hole of the square hole must be drilled in advance.

24.Drilling square holes 2b

Drilling sharp corner square hole mechanism based on “drilling square hole 1a”.

25.Drilling hexagon holes 2a

The Lullo pentagon rotates within a hexagon. The trajectories of the pentagon at different points are shown. The red track is part of the hexagonal hole drilled. Its horns are sharp. Hexagonal inner round holes must be drilled in advance.

26.Drilling hexagon holes 2b

Drill sharp Angle hexagonal hole mechanism based on “Drill hexagonal hole 2a”.

27.Drilling triangle holes 1a

An ellipse rotates within a triangle. The trajectories of the ellipse at different points are shown. The red track is part of the triangular hole drilled. Its horns are sharp. Triangulated inner round holes must be drilled in advance.

28.Drilling triangle holes 1b

Drill sharp Angle triangle mechanism based on “Drill Triangle 1A”.

29.Irregular (scalene) Reuleaux triangle

An irregular Rulo triangle rotates within a square. A schematic diagram of Lullo’s triangle and trajectories of different points are shown.

30.Mechanism for advancing perforated strip