  A low-energy magnetic dipole $(M1)$ spin-scissors resonance (SSR) located
just below the ordinary orbital scissors resonance (OSR) was recently predicted
in deformed nuclei within the Wigner Function Moments (WFM) approach. We
analyze this prediction using fully self-consistent Skyrme Quasiparticle Random
Phase Approximation (QRPA) method. Skyrme forces SkM*, SVbas and SG2 are
implemented to explore SSR and OSR in $^{160,162,164}$Dy and $^{232}$Th.
Accuracy of the method is justified by a good description of M1 spin-flip giant
resonance. The calculations show that isotopes $^{160,162,164}$Dy indeed have
at 1.5-2.4 MeV (below OSR) $I^{\pi}K=1^+1$ states with a large $M1$ spin
strength ($K$ is the projection of the total nuclear moment to the symmetry
z-axis). These states are almost fully exhausted by $pp[411\uparrow,
411\downarrow]$ and $nn[521\uparrow, 521\downarrow]$ spin-flip configurations
corresponding to $pp[2d_{3/2}, 2d_{5/2}]$ and $nn[2f_{5/2}, 2f_{7/2}]$
structures in the spherical limit. So the predicted SSR is actually reduced to
low-orbital (l=2,3) spin-flip states. Following our analysis and in
contradiction with WFM spin-scissors picture, deformation is not the principle
origin of the low-energy spin $M1$ states but only a factor affecting their
features. The spin and orbital strengths are generally mixed and exhibit the
interference: weak destructive in SSR range and strong constructive in OSR
range. In $^{232}$Th, the $M1$ spin strength is found very small. Two groups of
$I^{\pi}=1^+$ states observed experimentally at 2.4-4 MeV in $^{160,162,164}$Dy
and at 2-4 MeV in $^{232}$Th are mainly explained by fragmentation of the
orbital strength. Distributions of nuclear currents in QRPA states partly
correspond to the isovector orbital-scissors flow but not to spin-scissors one.
