# Haas ST-10 Used Price & Common Problems | CNC Ledger

> Haas ST-10: used $39,000 to $50,000. Documented problems: spindle bearing and tailstock sticking. What to inspect before you buy.

**Verdict:** inspect

$39,000–$50,000 observed used. Biggest documented cost risk: tailstock sticking, a named failure mode on this model family. Buy only after inspection.

**Observed used price:** $39,000–$50,000

**Documented failure risks:**
- Tailstock sticking: Tailstock sticking is a documented, named failure mode on this exact model family:
- Chuck backing plates: Broken/trashed backing plates on both chucks by the time of teardown
- Rail covers and rails: Rail covers and rails needing replacement; general chips/cable/motor/linear-guide
- Bed twist requiring a laser: Bed twist requiring a laser-level tool and machinist jacks to correct during
- Lathe cutting a taper: "What To Do if Your Lathe is Cutting a Taper" -- Haas Automation official service tip
- Spindle bearing: Documented ST-10 spindle teardown found catastrophic front bearing failure with destroyed cage and damaged journal.
- Spindle bearings (family): Family-level: grinding or whining at high RPM is the most common Haas spindle failure, usually bearing related.
- Hydraulic chuck clamp / foot pedal proximity switches: ST-10 chuck would not clamp because foot-pedal proximity switches had been reassembled into the wrong connector plugs.
- Serial-comms errors: Intermittent serial-comms faults that drop the home position and force re-dialing: "It will randomly fire off a serial comms error on any of the axes. There is no rhyme or reason... when it errors then it loses its home position so everything has to get dialed back in again." Reported unresolved after new ferrules, cables, a MOCON board revision, and transformer swaps, a costly, elusive electrical fault to chase on a used unit.

## Sources
- [premierequipment.com](https://premierequipment.com/brands/haas-lathe/) (accessed 2026-08-19)
- [machinio.com](https://www.machinio.com/models/haas/st-10) (accessed 2026-08-19)
- [machinestation.us](https://www.machinestation.us/) (accessed 2026-08-19)
- [exapro.com](https://www.exapro.com/) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=8JOEZFj9X9k) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=2fPeT3LQCl0) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=ORX6WLuvm7Q) (accessed 2026-08-19)
- [midwestcncservices.com](https://midwestcncservices.com/insights/spindle-diagnostics/rebuild-vs-replace-spindle-economics/) (accessed 2026-08-19)
- [r.jina.ai](https://r.jina.ai/https://www.machinio.com/models/haas/st-10) (accessed 2026-08-19)
- [northlandtool.com (failure evidence)](https://www.northlandtool.com/case-studies/haas-st-10-spindle-repair/) (accessed 2026-09-02)
- [restlessmachines.com (failure evidence)](https://restlessmachines.com/haas-spindle-repair/) (accessed 2026-09-02)
- [practicalmachinist.com (failure evidence)](https://www.practicalmachinist.com/forum/threads/st10-lathe-draw-bar-not-clamping-2005-new-to-me-just-moved-installed-and-powered-it-up.429012/) (accessed 2026-09-02)
- [2014 Haas ST-10 challenging problem (Practical Machinist)](https://www.practicalmachinist.com/forum/threads/2014-haas-st-10-lathe-challenging-problem.435556/) — "It will randomly fire off a serial comms error on any of the axes. There is no rhyme or reason ... the machine holds tight tolerances perfectly (expect when it errors then it loses its home position so everything has to get dialed back in again" (accessed 2026-09-12)

_Last verified 2026-09-12. Source: CNC Ledger — https://cncledger.com/machines/haas-st-10/ — every claim checked against a primary source before publication (see /methodology/)._