Which method will result in a more accurate finish on lathe-turned work?

Which method will result in a more accurate finish on lathe-turned work?

• A. Finishing with a broadnose tool
• B. Roughing with a parting tool
• C. Finishing with a trailing tool
• D. Using a high-speed cutting fluid

Answer: (A)

Finishing with a broadnose tool yields a more accurate finish because its larger nose radius provides a gentler, more uniform engagement with the work. That bigger contact area smooths out material removal, reduces the visibility of feed marks, and minimizes tool deflection and chatter, giving a steadier cut and tighter tolerances on lathe-turned surfaces. Roughing with a parting tool creates higher cutting forces and a rougher surface, while finishing with a trailing tool can work in some setups but isn’t as reliably smooth for straight cylindrical work. Cutting fluid helps cooling but doesn’t fix the finished texture if the tool geometry isn’t right.

Finishing with a broadnose tool yields a more accurate finish because its larger nose radius provides a gentler, more uniform engagement with the work. That bigger contact area smooths out material removal, reduces the visibility of feed marks, and minimizes tool deflection and chatter, giving a steadier cut and tighter tolerances on lathe-turned surfaces. Roughing with a parting tool creates higher cutting forces and a rougher surface, while finishing with a trailing tool can work in some setups but isn’t as reliably smooth for straight cylindrical work. Cutting fluid helps cooling but doesn’t fix the finished texture if the tool geometry isn’t right.