RUG100 Notebook Sample Block What it is: A compact notebook style sample block for six key machining processes: turning, end milling, flat milling, surface grinding, external grinding, and polishing. Standards and calibration: Contains standards for the six most important processing methods among the 'AA' values. All 30 samples are calibrated with uAA (arithmetic mean) and metric equivalent um Ra. Flat Grinding details: Flat Grinding samples are 2, 4, and 8; each sample measures 7/8 in by 3/8 in. Each type for surface finish is a true and consistent reproduction, providing a realistic sense of the feel, appearance and texture of machined parts. Quick comparison and SAE compliance: Allows convenient, quick comparison and helps ensure compliance with SAE specifications. Size and weight: Overall wallet size fully enclosed is 6 x 3 x 3/8 inches. Unit weight is approximately 14 ounces (estimate). Use scenarios: Training and education: Use to illustrate and compare surface finishes across turning, milling, grinding, and polishing to build familiarity with feel and texture of machined parts. Quality control and inspection: Reference standard samples to quickly assess surface finish against SAE specifications during inspection. Supplier qualification and specification development: Use as a benchmark to establish accepted roughness and texture criteria for parts, bids, and manufacturing processes.