🔍 Key Concepts
• Match the tool nose shape to the surface shape of Fig. I (smooth, rounded transition).
• Distinguish between roughing tools, finishing tools, and threading/parting tools by the way their cutting edge is shaped.
• Look at how each tool (A, B, F, G) would contact the work: a finishing tool should leave a continuous, smooth surface, not grooves or sharp shoulders.
💭 Think About
• Which of the tools shown would naturally produce a smooth, flowing radius like the curved area in Fig. I when fed along the work?
• Which tools are clearly intended for other operations (such as cutting grooves, threads, or sharp shoulders), and therefore would NOT be ideal for a smooth finish cut?
• If you imagine feeding each tool parallel to the lathe bed, which one would touch the work with a rounded nose rather than a sharp point or a narrow edge?
✅ Before You Answer
• Verify which tool has a rounded cutting edge that matches the contour in Fig. I.
• Eliminate any tools whose shape would create threads, grooves, or sharp corners instead of a smooth finish.
• Confirm that the selected tool, when fed along the workpiece, would maintain continuous contact across the curved surface in Fig. I.