Abstract Sustainable production depends on the optimization of manufacturing processes. The assessment of carbon emissions in manufacturing is crucial for achieving sustainability. However, a comprehensive systematic framework to reflect the carbon emission regularity of manufacturing processes is currently lacking. This study focuses on the modeling and evaluation of carbon emissions by considering machining processes and multiple factors. First, carbon emission models for machining processes, such as turning, milling, and drilling, are systematically summarized by considering power consumption. Second, the influence of system parameters on carbon emissions is analyzed. Results show that cutting depth exerts a substantial effect on carbon emissions, and material removal rate has minimal influence. Last, the emission reduction mechanism and performance of novel sustainable machining processes are examined to contribute to carbon emission reduction. This study helps in systematically understanding carbon emissions in manufacturing processes, providing support for the further development of sustainable manufacturing.