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

Table 9

Surface roughness results for samples 4, 5, and 6.

Machining parameters	Sample	Surface; roughness Rz; (μm)	Average of Rz; (μm)	Roughness Grade
= 1100(rpm)	4	27.105	26.5353	~ 5
S= 30(mm/min)	5	27.568
t= 0.2(mm)	6	24.933