Calculate what a turned part should cost.
A turned part is costed from its stock, its cuts and its secondary features. ARCNM recognises a rotational part in the STEP geometry, sizes the bar or blank, times the roughing and finishing cuts, prices threads, grooves, bores and cross-holes, and picks the machine class — 2-axis lathe, live-tool turning centre, Swiss-type or mill-turn — that wins at your lot size. The result is a unit cost per quantity with the routing behind it.
At a glance
- Inputs
- STEP model of a rotational part; PDF drawing optional (fits, finish)
- Machine classes
- 2-axis lathe · live-tool turning centre · Swiss-type · mill-turn · band / circular saw for cut-to-length
- Standards applied
- ISO 286 fits · ISO 2768 · ISO 513 · DIN 8580
- DfM checks
- narrow groove, deep groove, length-to-diameter ratio, deep hole needs peck drilling, bore breakout
- You get
- bar or blank size, routing with setups and time per operation, threads and secondary features priced, machine class chosen per lot size
What do you get for a turned part?
The stock sized, the roughing and finishing cuts timed, and threads, grooves, bores, drilled and reamed holes priced as their own operations — each with setup and cycle time on the lathe chosen for the lot. Cross-holes and flats go to a live-tool station when your fleet has one, so a second machine appears on the routing only when it is really needed. Material is priced from the bar actually consumed, and every line on the cost sheet names the feature behind it.
What moves the price of turned parts?
Stock utilisation first — a stepped shaft turned from a bar wastes everything between the bar and the finished profile. Then the length-to-diameter ratio, tight fits such as H7/g6 read from the drawing, surface finish, thread count and any milled features that force a second setup. ARCNM prices each and shows, per lot size, whether a 2-axis lathe, a Swiss-type or a mill-turn machine is chosen.
What is covered on the turning side?
- Rotational classification from the geometry, including multi-stepped mill-turn profiles.
- Turning, facing, grooving, thread turning, boring, drilling, reaming, tapping, cross-drilling on live tooling.
- Bar-stock sizing and cut-to-length on a saw class, or a purchased blank when the fleet has no saw.
- Fits and tolerances read from the drawing (ISO 286, ISO 2768) and bound to the feature they constrain.
2-axis, live-tool, Swiss-type or mill-turn?
| Machine class | Adds | Typical part | When it wins |
|---|---|---|---|
| 2-axis lathe | turning, facing, grooving, threading, boring | shafts, bushings, simple discs | no milled features; lowest hour rate |
| Live-tool turning centre | cross-holes, flats, keyways in the same clamping | shafts with pins and flats | any milled feature that would force a second machine |
| Swiss-type | guide bushing for long, slender parts | pins, needles, connectors below ~32 mm | length ≫ diameter, high volumes, tight runout |
| Mill-turn centre | full milling spindle, B-axis | complex housings from bar | several setups collapse into one; small lots of complex parts |
Related terms
Frequently asked questions
How do I calculate the cost of a turned part?
From the stock it consumes, the cuts it takes, its threads and secondary features, the machine-hour rate, and the setup amortised over the lot. ARCNM does all of that from the STEP file and drawing, and shows the breakdown per operation.
Does ARCNM handle Swiss-type and mill-turn parts?
Yes. Swiss-type lathes and mill-turn centres are machine classes in your fleet. ARCNM compares them against a plain 2-axis lathe at every lot size, and the lot-size curve shows which machine is chosen at each quantity.
What about the material cost of a turned part?
Material is priced from the bar or blank actually consumed, not the finished volume, using your environment's material prices with an as-of date, so a price move in steel or brass shows up in the next calculation.