, ( ). . β (. 39).
, . , , , , ; .
(. 39), , , . . , , 6- 30 /; 7- 15 /; 8- 10 /; 9- 4 /.
, , εγ εα εβ
εγ = εα + εβ > 2,
.
. 39. . . 40. .
, , - (. 40, ). = n / , n , . : t = t / π, t , ; = / π, , .
t = n / cosβ, t = / sβ.
, . .
h = ha + hf = mn+ 1,25 mn = 2,25 mn,
d = mt z = mn z / cosβ.
:
da = d + 2 ha = d + 2 mn;
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df = d 2 hf = d 2,5 mn;
= mt(z1 + z2) / 2 = mn (z1 + z2) / (2cosβ).
εβ = b / ,
b ; .
, εβ , , , , . l ∑ = b εα /cosβ.
Fn (. 40, ): Ft Fr Fa, :
Ft = 2 T / d; Fr = Ft tg α /cosβ; Fa = Ft,tgβ,
; α .
. β = 8...20, , β , , .
.
, , . , , , . .
. , 90.
, , . . (. 41): () (). Fa / , , . β = 2540, , . . .
, .
. 41. : . 42. , -.
) ; ) .
. . , . , . . 42 , -.
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= d / (2cosβ) = d /2, d . ,
ρν = 2 / c= d / (2cos2β).
,
dv = d /cos 2 β.
dv = mn zv, d = mn z /cosβ,
zv = z / cos3 β.
dv zv β, .