Turning guide · parts quotes
Both machines turn round parts. The difference is where the part is held while it is being cut. That one detail decides whether a long, thin part comes out straight, and whether a part with holes and features on both ends gets done in one cycle or three. Here is how to tell which one your part needs before you send the RFQ.
The bar or blank is gripped in a chuck or collet and sticks out toward the tool. The farther the cut is from the chuck, the more the part can push away and chatter. Long parts need a tailstock or steady rest, and the far end usually gets finished in a second operation.
The bar feeds through a guide bushing and the headstock moves the bar in and out. The tool cuts right next to the bushing, so the part is supported close to the cut the whole time. A sub-spindle can pick the part off and work the back end, and live tools drill and mill cross features in the same cycle.
If the part is not much longer than it is wide, a chuck holds it fine. A conventional lathe is often faster to set up.
Diameters past the Swiss bar capacity belong on a conventional lathe or a turning center.
Five simple parts rarely pay for a Swiss setup. Ask for quotes both ways if you are not sure.
A plain diameter-and-face part with loose tolerances does not need guide-bushing support.
Drawing with revision, STEP model, material and temper, quantity and any annual volume, the features that matter (concentricity, small holes, threads, surface finish), and any cleaning, passivation or paperwork. The full list is in what to send for a CNC machining quote. Ready to quote a Swiss job? Go to Swiss turning quotes. Need a first article report priced too: what drives first article inspection cost.
On a Swiss-type lathe the bar slides through a guide bushing and the tool cuts right next to that support, so the part is held close to the cut along its whole length. On a conventional lathe the part sticks out of the chuck and the cut moves away from the support as it goes. That is why Swiss handles long, thin parts that would bend on a conventional lathe.
A common rule of thumb is that once a turned part is longer than about three times its diameter, a conventional lathe needs a tailstock or steady rest to hold it, and Swiss starts to make sense. It is a starting point, not a hard limit: material, tolerance and features matter too.
Mostly. Swiss machines run from bar stock and are built for small diameters; many top out around 1 to 1-1/4 inch bar. Bigger diameters usually belong on a conventional lathe or a multi-axis turning center.
Short, stubby parts, large diameters, very low quantities and simple profiles usually run fine on a conventional CNC lathe. Swiss setup takes longer, so a handful of easy parts can cost more on Swiss than on a regular lathe.
The drawing with revision, a STEP model, material and temper, bar size if you know it, quantity and annual volume, the tight features (concentricity, small holes, threads, finish), and any cleaning, passivation or paperwork the job needs.
One RFQ, routed by a person to shops that fit. Call or text 508-343-1219.