C enterless belt grinding machines that have been designed previously at the Department of Mechanical Engineering, University of Trisakti can be utilized to produce conveyor belt shaft products. However, it is not yet known how the characteristics and performance of this machine and is there any influence of this machine in the finishing process after undergoing the turning process. The characteristics here are the results of measurements of cylindrical, roundness, and surface roughness resulting from the grinding process. Therefore, research was carried out with the aim of knowing the consistency and performance of this machine, as well as the differences in the results of the two machining processes. The research was carried out by analyzing control charts to determine consistency and speed comparisons to determine engine performance. Meanwhile, to determine whether there is a significant difference between the turning and grinding process is done by using a statistical test paired sample t test with SPSS software. Consistency test results on measurements of cylindrical, roundness and surface roughness show that there is consistency with good performance achieved at a maximum speed of 25.47 mm/min (angle 12°). The statistical test results of the paired t test between the turning and grinding processes had significant differences indicated by the P-value (0.00) < ∝ (0.05) in cylindricality, roundness, and surface roughness.