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The research leading to these results has received funding from the commissioned task
entitled “VIA CARPATIA Universities of Technology Network named after the President of the Re-
public of Poland Lech Kaczyński” contract no. MEiN/2022/DPI/2575 action entitled “In the neigh-
borhood-inter-university research internships and study visits”.
Trochoidal milling is one of the solutions for increasing the efficiency of machining pro-
cesses. A decreased cutting tool’s arc of contact leads to a reduction in the generated cutting forces,
thus improving process stability. Vibration is an inherent part of any machining process, affecting
the accuracy and quality of the manufactured components, but it can also pose a danger to machine
operators. Chatter is particularly detrimental, leaving characteristic marks on shaped surfaces and
potentially leading to catastrophic tool damage. Therefore, it is important to ensure the stability of
machining and also reduce vibration. The primary purpose of the conducted research is to evaluate
the stability of the milling process of the AZ91D magnesium alloy performed through a trochoidal
strategy. An additional objective is to establish the effect of the variation in machining parameters
and toolholder types on milling stability. Three types of toolholders most commonly used in indus-
try are used in the study. The basis of the investigation is the measurement of vibration displace-
ment and acceleration analysed in the time domain. A spectral analysis of the signals is also per-
formed based on Fast Fourier Transform, to identify signal components and detect the susceptibility
to chatter occurrence. An important part of the study is also an attempt to use the Composite Mul-
tiscale Entropy as an indicator to determine the stability of the machining processes. Entropy does
not exceed the values of 1.5 for cutting speed and 2.5 for feed per tooth, respectively. Vibration
acceleration does not exceed (in most cases) the value of 20 m/s 2 for the peak-to-peak parameter and
the shrinkfit toolholder. For vibration displacement (peak-to-peak parameter), there are oscillations
around the value of 0.9 mm for all kinds of toolholders.
