The reduction of lubricants plays an important role in improving sustainability of machining processes. However, the heat development in dry machining can lead to poor surface qualities. Therefore, cryogenic cooling with liquid carbon dioxide (LCO2) has been introduced to adopt the cooling function of conventional lubricants. The density of the CO2 stream varies depending on a number of factors, such as change in ambient temperature, the length of the supply line and filling level of the CO2 riser bottle. This affects the cooling capacity as it determines the amount of CO2 that can expand at the nozzle outlet to cool the cutting operation. In addition, density variations cause turbulence in the jet formation at the nozzle exit. This prevents a meaningful combination of this cooling strategy with minimum quantity lubrication, as the oil droplets cannot reach the cutting zone uniformly. Furthermore, an unstable cooling process directly affects product quality. Thus, the stabilization of the CO2 density is a key factor in improving process controllability. Possible optimizations of the supply line regarding the CO2 density as well as means to adjust the CO2 flow rate dynamically are discussed in this paper.