An Investigation on Speed Control of a Spindle Cluster Driven by Hydraulic Motor: Application to Metal Cutting Machines

Table 8

Surface roughness results for samples 1, 2, and 3.

Machining parameters	Sample	Surface; roughness Rz; (μm)	Average of Rz; (μm)	Roughness Grade
= 1100(rpm)	1	21.427	21.381	~ 5
S= 30(mm/min)	2	21.331
t= 0.2(mm)	3	21.385