Production ticket from 18.05.2026. Captured 1 decision and 2 actions; mentions 3 people and 1 project.
Decisions
Actions
- Done: Elena Rossi: Order eight spare spindle bearings (due 12.06.2026) · Line 3 retrofit
- Done: Nina Frei: Add the vibration readings to the maintenance log (due 29.05.2026) · Line 3 retrofit
People mentioned
Projects
Original text
Date: 2026-05-18
Type: Production ticket
Reporter: Thomas Huber
Assignee: Nina Frei
Status: Closed
Tags: #line-3-retrofit
Problem
Quality found chatter marks on 14 titanium bone screws (order 26-1187). The marks come from spindle 2 on Line 3, which vibrates above 9'000 rpm.
Analysis
Nina Frei ran the spindle at 6'000, 9'000 and 12'000 rpm and measured with the hand-held vibration meter. Reading at 12'000 rpm: 4.8 mm/s (limit 2.8 mm/s). Cause: a worn front bearing on spindle 2.
Fix
- Bearing replaced by Nina Frei and the Aarmatic service technician on 21.05.2026.
- Spindle calibrated again with the reference mandrel; runout 2 µm after the fix.
- The 14 parts were scrapped; the customer was not affected.
Decided: Replace the bearings on all four spindles of Line 3 during the retrofit window, not one by one when they fail.
Why: spindles 1, 3 and 4 have the same running hours as spindle 2.
- Action: @Elena Rossi order eight spare spindle bearings (due 2026-06-12) (done)
- Action: @Nina Frei add the vibration readings to the maintenance log (due 2026-05-29) (done)