🔍 Key Concepts
• Look at each labeled tool shape (P, S, T, U) and recall the typical lathe cutting tool types: turning, facing, parting, and threading tools.
• Think about the direction and length of the cutting edge in relation to the workpiece axis – rough and finish turning use tools whose main cutting edge runs roughly parallel to the work axis.
• Identify if any of the figures represents a special‑purpose tool (such as a parting/grooving or threading tool) rather than a general turning tool.
đź’ Think About
• For each of the figures P, S, T, and U, ask: Is this tool primarily designed to remove material along the cylindrical surface, or for a more narrow operation like cutting off or cutting grooves/threads?
• Which of these tools would have too small or too thin a cutting edge to be efficient or safe for heavy roughing cuts along the length of the workpiece?
• On an engine lathe, which tool shape would you normally reserve for operations at a specific location (like cutting a groove or shoulder) instead of traversing along the work for turning?.
âś… Before You Answer
• Verify which figures clearly show a broad side-cutting edge suitable for traveling along the workpiece for rough or finish turning.
• Identify which figure’s cutting edge is narrow and oriented radially toward the centerline – a clue that it is meant for parting or grooving rather than turning.
• Before choosing, be sure you can explain to yourself what specific operation each tool (P, S, T, U) is best suited for on the lathe.