  In this paper, we consider a mass-spring-friction oscillator with the
friction modelled by a regularized stiction model in the limit where the ratio
of the natural spring frequency and the forcing frequency is on the same order
of magnitude as the scale associated with the regularized stiction model. The
motivation for studying this situation comes from \cite{bossolini2017b} which
demonstrated new friction phenomena in this regime. The results of Bossolini et
al 2017 led to some open problems, that we resolve in this paper. In
particular, using GSPT and blowup we provide a simple geometric description of
the bifurcation of stick-slip limit cycles through a combination of a canard
and a global return mechanism. We also show that this combination leads to a
canard-based horseshoe and are therefore able to prove existence of chaos in
this fundamental oscillator system.
