🔍 Key Concepts

• Lathe finishing tool vs roughing or facing tools • How tool shape and angle affect surface finish on a rotating shaft • Differences between tools used for threading, parting, grooving, and finishing

💭 Think About

• Look closely at each labeled figure (P, S, T, V). Which tool has the broad, shallow cutting edge best suited for taking a light, smooth final cut along the surface? • Which figures show tools designed for special operations like cutting grooves, shoulders, or threads rather than for improving surface smoothness? • On the illustration, where is the tool positioned relative to the workpiece when the goal is to improve the overall surface finish of a cylindrical section?

✅ Before You Answer

• Verify which figure shows a tool with a slight side rake and nose radius that would leave a smooth surface on the shaft. • Eliminate any figures that clearly show thread-cutting, grooving, or parting tools (narrow or pointed tools). • Confirm that the selected figure is set up to cut along the length of a cylindrical surface, not just at a shoulder, groove, or thread.