  The stick-slip phenomenon widely exists in contact mechanics, from the
macroscale to the nanoscale. During cholesteric-nematic unwinding by external
fields, there is controversy regarding the role of planar surface anchoring,
which may induce discontinuous stick-slip behaviors despite the well-known
continuous transitions observed in past experiments. Here, we observe three
regimes, namely constrained, stick-slip, and sliding-slip, under mechanical
winding with different anchoring conditions, and measure the responded forces
by the Surface Force Balance. These behaviors result from a balance of
cholesteric elastic torque and surface torque, reminiscent of the slip
morphology on frictional substrates [T. G. Sano et al., Phys. Rev. Lett. 118,
178001 (2017)], and provide evidence of dynamics in static rotational friction.
