Question 29 QMED05 - Machinist-Pump Technician

The Correct Answer is A **Explanation for A (A):** Tool A is typically an offset or straight finishing tool (often with a relatively large nose radius) used for light cuts to achieve a high-quality, smooth surface finish. The objective is to produce a smooth finish cut for Figure I, which is a common task for this type of tool geometry. The slight roundness of the cutting edge and appropriate relief angles minimize friction and vibration, resulting in a superior surface finish compared to roughing tools. **Explanation for B (F):** Tool F appears to be a form tool or specialized grooving/threading tool, characterized by a specific profile (such as a sharp point or distinct radii) designed to create a specific shape or thread profile, not generally used for achieving a general smooth finish cut across a surface. **Explanation for C (G):** Tool G is typically identified as a threading tool (or a sharp pointed tool for specific internal corner relief or fine grooving). While sharp, this geometry is designed to cut V-shapes (like threads) and would leave a very distinct, rougher feed mark pattern unsuitable for a general smooth finish cut. **Explanation for D (D):** Tool D appears to be a standard roughing or turning tool used for removing large amounts of material quickly. Roughing tools typically have larger side cutting edge angles, smaller nose radii, and robust construction, which prioritize material removal rate over surface quality, resulting in a rougher surface finish.