Turn-Mill Machined Typical Parts
Ten part families where turning and milling in one setup is what keeps feature-to-feature accuracy, our signature process for complex rotating parts.
Ten Part Families We Run Repeatedly
| Part family | Common materials | Key tolerances | Typical finish | Typical order |
|---|---|---|---|---|
| Complex shafts with milled flats | 4140, 303 | Flat to journal +/-0.01 mm, one setup | Black oxide / passivated | 200 to 2,000 pcs |
| Medical instrument shafts | 303, 17-4PH | Feature position +/-0.01 mm, Ra 0.4 | Passivated, cleaned | 500 to 5,000 pcs |
| Motor shafts with flats and cross holes | 4140, 1045 | Cross hole position +/-0.02 mm | Black oxide | 500 to 5,000 pcs |
| Robot joint drive shafts | 4140, 40Cr | Journal concentricity 0.005 mm | Induction hardened, ground | 200 to 2,000 pcs |
| Connector bodies with milled pockets | C36000, 303 | Pocket to thread +/-0.01 mm | Ni plated / passivated | 1,000 to 10,000 pcs |
| Eccentric sleeves and cams | 1045, 4140 | Eccentricity +/-0.01 mm | Black oxide | 200 to 1,000 pcs |
| Aerospace pins and fittings | Ti-6Al-4V, 7075 | Position +/-0.02 mm, FAI per AS9102 | Alodine | 20 to 200 pcs |
| Threaded manifold plugs with cross drills | 316L, brass | Cross-drill intersection +/-0.05 mm, leak tested | Passivated | 1,000 to 10,000 pcs |
| Couplings with milled drive slots | 6061-T6, 303 | Slot width +0.02/-0, runout 0.01 mm | Clear anodize | 500 to 5,000 pcs |
| Encoders and rotary sensor hubs | 6061-T6, 303 | Feature-to-feature +/-0.005 mm | Black anodize | 200 to 2,000 pcs |
Capability detail: turn-mill machining.
Frequently Asked Questions
Why turn-mill instead of turning plus a milling op?
Every re-chuck adds error between features. On parts where a milled feature must sit true to a turned journal, one setup is the only way to hold +/-0.01 mm feature-to-feature without expensive inspection sorting.
Is turn-mill more expensive per part?
Unit price can be similar or lower once second-op handling, re-fixturing and inspection sorting are counted. We quote both routes when the difference is close and let the numbers decide.
Do you document feature-to-feature accuracy?
Yes, the CMM report groups features by datum so your quality team can see the single-setup relationships explicitly.
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