The lathe tool shown as figure "R" in the...

🔍 Key Concepts

• Right-hand vs left-hand lathe tools and which direction the carriage feeds for each type • Difference between a roughing tool (broad cutting edge for general turning) and a grooving tool (narrow, for cutting channels/parting) • How a tool’s cutting edge orientation relates to forming a shoulder versus a groove on the workpiece

💭 Think About

• Look at tool R’s cutting edge and point: if the carriage moves from the tailstock toward the headstock, would this tool actually be cutting, or would it rub? What does that tell you about right-cut vs left-cut? • Is the width of tool R’s nose more suited to removing material along a length (rough turning) or to cutting a narrow channel (groove/shoulder)? • Compare tool R’s shape with the other tools in the figure that are clearly for threading or grooving—does R look more like a general turning tool or a narrow-form tool?

✅ Before You Answer

• Verify which end of the lathe is the headstock (chuck) and which direction is considered a right-hand cut on a lathe • Check whether tool R has a narrow, parting-like blade (typical of grooving) or a wider, angled cutting face (typical of roughing tools) • Confirm from the tool’s geometry which side of the cutting edge leads in the cut to decide between right-cut and left-cut operations before choosing your answer

The lathe tool shown as figure "R" in the illustration would best be used to __________. Illustration GS-0090

form a right-cut square shoulder

perform a right-cut rough turning operation

perform a left-cut rough turning operation

form a left-cut groove

🔍 Key Concepts

💭 Think About

✅ Before You Answer