Helix (Lead) angle area by using graph

Helix angle evaluation

T.P.Iφ(φL)φ(φL)φ(φL)φ(φL)
2

3

4 4.5 5 6 7 8 9 10 11.5 11 12

φ(φL) 1°

Detailed view for small pitch/diameter

T.P.I 13 14 16

18 19 20 22 24 26 28 27 32 36 40 44 48 60 56 72 64 80

Diameter [inch]

φ(φL)φ(φL)φ(φL)φ(φL)

φ(φL) 1°

1/64 1/32 1/16 3/32 1/8 5/32 3/16 Diameter [inch]