# DMG Mori DMU 50: Used-Buy Risk, Price & What to Check | CNC Ledger

> Used DMG Mori DMU 50 5-axis prices ($89,900–$177,800), the high-rpm spindle, TSC seal and trunnion checks, and a pre-purchase checklist.

**Verdict:** inspect

~$89,900 to ~$177,800 used — the wide spread reflects control (Siemens vs Heidenhain), spindle (10k vs 18k rpm) and ATC size. High-rpm spindle and TSC seal are the big cost risks; on a 5-axis, the trunnion/rotary table backlash is the defining used-machine inspection. Confirm control type and 5-axis accuracy.

**Observed used price:** $89,900–$177,800

**Documented failure risks:**
- High-speed spindle bearing: The higher-spec units run an 18,000 RPM HSK spindle; high-rpm spindles have shorter bearing life. Rebuild-vs-replace economics and runout thresholds are documented (Haas-framed, but the mechanism is general) — treat the cost band as indicative, not DMU-specific. Check runout and high-rpm noise.
- Coolant intrusion via TSC: Units carry through-spindle coolant; the same seal/air-purge failure path washes out bearing grease. Verify the rotary-union seal and air-purge pressure.
- 5-axis trunnion / swivel-rotary (B/C axis): Inspection point (not independently sourced this pass): the tilting-rotary table is the defining wear item on a used 5-axis — inspect for backlash and clamp integrity, and test a 5-axis part for accuracy. Treat as a pre-purchase check, not a documented defect.

## Sources
- [DMG Mori DMU 50 used prices (model page)](https://www.machinio.com/models/dmg-mori/dmu-50) (accessed 2026-09-11)
- [Spindle Rebuild vs Replace Economics](https://midwestcncservices.com/insights/spindle-diagnostics/rebuild-vs-replace-spindle-economics/) — "A Haas VF-series rebuild has come in between $4,800 and $7,200 … a replacement spindle for the same machine … runs $16,000 to $24,000 before install." (accessed 2026-09-11)
- [Coolant Intrusion Damage](https://midwestcncservices.com/insights/spindle-diagnostics/coolant-intrusion-damage/) — "A 30-second coolant ingress event during a coolant pressure spike can ruin a healthy bearing." (accessed 2026-09-11)
- [FANUC CNC Systems (lifetime-support statement)](https://www.fanucamerica.com/products/cnc/cnc-systems) — "we offer lifetime support for all FANUC products as long as they are in use" (accessed 2026-09-11)

_Last verified 2026-09-11. Source: CNC Ledger — https://cncledger.com/machines/dmg-mori-dmu-50/ — every claim checked against a primary source before publication (see /methodology/)._