RUBERT – England Roughness Comparison Specimens

RUBERT NO. 130: COMPOSITE SET OF ROUGHNESS SPECIMENS. This set consists of 30 comparison specimens, covering six commonly-used.
Machining methods (6 turned, 6 end-milled, 6 horizontally milled, 6 surface-ground, 3 lapped, 3 reamed/drilled.
A label gives the Ra and Rz values of each specimen in both metric and imperial units. Turning – 0.4μm, 0.8μm, 1.6μm, 3.2μm, 6.3μm, 12.5μm. Vertical milling – 0.4μm, 0.8μm, 1.6μm, 3.2μm, 6.3μm, 12.5μm. Horizontal milling – 0.4μm, 0.8μm, 1.6μm, 3.2μm, 6.3μm. Grinding – 0.05μm, 0.1μm, 0.2μm, 0.4μm, 0.8μm, 1.6μm. Flat lapping reaming – 0.05μm, 0.1μm, 0.2μm, 0.4μm, 0.8μm, 1.6μm
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