Precision Turning Cost Drivers
Turning quotes are driven by setup time, cycle time per part, material cost, tolerance requirements, and quantity. Here's how each factor moves the price.
Setup Time
Every CNC turning job starts with a setup — loading the program, installing tooling, setting tool offsets, dialing in the first part, and running a first-article inspection. Setup takes 30–90 minutes depending on complexity. On a $100/hour machine, that's $50–$150 before the first production part is cut. This is why low-quantity turning jobs have a high per-part cost — the setup is amortized over fewer parts.
Cycle Time
The dominant cost driver for any quantity above 10 pieces. Cycle time is determined by the amount of material being removed, the number of operations (OD turning, boring, threading, grooving), and the tolerance requirements (tighter tolerance = lighter finishing passes = more time).
Ballpark cycle times: A simple 1" diameter × 2" long shaft in tool steel with one OD, one bore, and a thread might run in 3–5 minutes. A complex tooling component with multiple diameters, bores, grooves, and a fine finish might run 15–30 minutes. Cycle time scales roughly linearly with material removal volume and number of features.
Material
Material affects cost in two ways: the raw stock cost and the machinability. A 2" diameter D2 bar costs roughly $15–25/foot. The same diameter in Inconel costs $80–150/foot. The machinability difference compounds — Inconel cuts 3–5x slower than D2, which means 3–5x more machine time per part on top of the higher raw material cost.
Tolerance
Tighter tolerances cost more because they require lighter finishing passes (more time), more careful measurement (more time), and higher scrap rates (more waste). Going from ±0.001" to ±0.0002" on a diameter typically adds 1–3 minutes per part for the additional finishing and measurement passes. On a 100-piece run, that's $150–$500 of additional cost.
Quantity Effects
| Quantity | Setup % of Total | Relative Per-Part Cost |
|---|---|---|
| 1 piece | 50–70% | Highest |
| 5 pieces | 20–30% | High |
| 25 pieces | 5–10% | Moderate |
| 100 pieces | 2–5% | Low |
| 500+ pieces | <1% | Lowest — dominated by cycle time |
What Drives Cost Down
Quantity. The single biggest lever. Setup amortizes rapidly.
Providing bar stock specs. Tell the shop what diameter and grade to order. If they have to figure it out, it takes time and they'll add margin for uncertainty.
Tolerances only where needed. Call out the critical dimensions. Leave the rest at general tolerance.
Standard tooling features. Standard groove widths, standard thread forms, standard bore sizes that match available boring bars.
The fastest way to get a lower turning quote is to increase quantity. A 50-piece order is almost always less than 2x the cost of a 25-piece order. If you're going to need 50 eventually, order them all now. The per-part savings from amortizing setup and leveraging material purchasing almost always beat the carrying cost of inventory.
Want to understand what your part will cost?
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