1^st ALT

2^ndALT

3^rdALT

Initial Design

Second Design

Final Design

In 54,000

Cycles,

Fracture of helix is less than 1.

170 cycles: 1/10 (10%)

5200 cycles: 1/10 (20%)

7780 cycles: 2/10 (40%)

8800 cycles: 2/10 (60%)

11600 cycles: 4/10 (100%)

17,000 cycles: 1/6 (17%)

25,000 cycles: 3/6 (67%)

28,200 cycles: 1/6 (83%)

38,000 cycles: 1/6 (100%)

54,000 Cycles: OK

75,000 Cycles: OK

Helix Structure

Material and specification

PC + SUS (t = 1.2)

GAP: 2 mm

PC + SUS (t = 1.2)

GAP: 0 mm

PC + SUS (t = 1.2)

GAP: 0 mm

Added rib on side and front of helix