Definition
Why turned parts are comparatively easy to estimate
Turning's predictability comes from the geometry, not from the process being simple: a rotationally symmetric part exposes almost everything a lathe needs to know up front (diameters, lengths, groove positions), which is why turned profiles are often among the first shapes a manufacturing-feature recogniser and a process-planning estimate handle reliably. That predictability breaks down at the edges: an off-axis feature, a keyway, or a cross-drilled hole pushes the part toward milling or mill-turn, and the estimate has to follow.
Frequently asked questions
What parts are typically turned?
Shafts, pins, bushings, and any part that is mostly rotationally symmetric.
Can turning achieve tight tolerances alone?
For many features yes, but very tight tolerances or a fine finish may still need a grinding pass after turning.
Why are turned parts often cheaper per feature than milled ones?
Because a lathe can often machine multiple features (diameters, faces, grooves) in one continuous setup.