$\uparrow$ $N\cos (\gamma) - mg - \mu N\sin (\gamma) = 0 \Rightarrow N = 3581\mathrm{~N}$

\rightarrow N \sin (\gamma) + \mu N \cos (\gamma) - F _ {a} = 0 \Rightarrow F _ {a} = 2 1 6 3 \mathrm{N} M _ {1} = \frac {F _ {a} d _ {m}}{2} \left(\frac {\tan \alpha + \mu_ {g} ^ {\prime}}{1 - \mu_ {g} ^ {\prime} \tan \alpha} + \mu_ {u} \frac {D}{d _ {m}}\right) \mu_ {u} = 0, \quad \mu_ {g} ^ {\prime} = \frac {\mu_ {g}}{\cos \frac {\beta}{2}} = 0. 2 3 1

\mathrm {M} 8 \Rightarrow d _ {m} = 7. 1 8 8 \mathrm {m m}, p = 1. 2 5 \mathrm {m m}, \tan \alpha = \frac {p}{\pi d _ {m}} = 0. 0 5 5 4 \Rightarrow M _ {1} = 2. 2 5 4 \mathrm {N m}