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            [prod_desc] => 1 Research Method 1.1 Experimental Design Framework The machining workflow was designed to isolate the effect of tool shape and motion control on dimensional variation. Each variable was assigned a fixed range, and sample processing followed an identical sequence to ensure reproducibility. All cutting tools were inspected before and after each batch to eliminate edge-wear interference. 1.2 Data Sources Raw datasets were produced through controlled machining trials. Measuremen
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