Which of the following files will produce the finest surface on a work piece being finished filed in a lathe?
• File cuts and coarseness (bastard, second-cut, smooth) and how they relate to surface finish • Difference between single-cut (mill) files and double-cut files • Typical use and tooth pattern of warding files
• Think about which type of file removes the least material per stroke and leaves the shallowest teeth marks • Consider which of these files is normally used for finishing and smoothing rather than for fast stock removal • Ask yourself: which file type is usually single-cut with fine teeth, especially suitable when the work is already nearly to size in the lathe?
• Verify which option(s) are typically single-cut and fine-toothed • Check which option is generally used for coarse shaping vs. final finishing • Eliminate any file types that are mainly used for narrow slots, keyways, or general rough work, not for the smoothest finish
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