Which statement about taper turning on an engine lathe is true?

Which statement about taper turning on an engine lathe is true?

• A. Take a single light pass
• B. Take several passes to reach final diameter
• C. Do not machine the face
• D. Use immediate final diameter in one pass

Answer: (B)

In taper turning, the diameter changes along the length of the work, so you must remove material in steps rather than with a single cut. Start with a rough cut to establish the overall taper and then use several finishing passes to bring each portion to its precise final diameter and to refine the taper angle. This approach gives you better control of depth of cut, heat, and chatter, and it allows checking diameters at multiple locations as you progress. A single light pass can’t reliably produce the gradual diameter change required for a proper taper, and aiming for the final size in one pass ignores the varying diameter along the workpiece. Machining the face is not what defines the taper itself; it may be done separately if needed, but the taper comes from the controlled, progressive cuts along the length.

In taper turning, the diameter changes along the length of the work, so you must remove material in steps rather than with a single cut. Start with a rough cut to establish the overall taper and then use several finishing passes to bring each portion to its precise final diameter and to refine the taper angle. This approach gives you better control of depth of cut, heat, and chatter, and it allows checking diameters at multiple locations as you progress. A single light pass can’t reliably produce the gradual diameter change required for a proper taper, and aiming for the final size in one pass ignores the varying diameter along the workpiece. Machining the face is not what defines the taper itself; it may be done separately if needed, but the taper comes from the controlled, progressive cuts along the length.