TL;DR
Spindle vibration is most often a worn spindle bearing, an imbalanced bobbin, or a bent spindle shaft. Check oil level first, then rotate the spindle by hand to feel for roughness.
What you might see
- audible whine or grinding from the spindle bank
- vibration amplitude higher on affected spindles
- bobbin wobble visible at running speed
- spindle oil cup empty or showing discolored oil
Likely causes
Spindle bearing worn from insufficient lubrication or extended service life
Spindle oil cup empty or filled with wrong oil grade
Bent spindle shaft from cop or yarn package impact
Imbalanced or damaged bobbin causing resonance at running speed
Required tools
- Correct-grade spindle oil
- Dial indicator for run-out check
- Replacement spindle assembly
- Screwdriver for vibration sensing
Safety first
- Keep fingers away from rotating spindles. Even touching a spindle at running speed can cause a wrap injury.
- Spindle oil is a skin and eye irritant. Wear gloves and glasses when filling oil cups.
Procedure
- 1
Identify the noisy spindle by touching each spindle housing lightly with a screwdriver handle to conduct vibration to your hand while the machine runs at reduced speed.
- 2
Stop the machine and check the oil cup of the identified spindle. Refill with the correct grade of spindle oil if the cup is empty or below the minimum mark.[1]
- 3
Remove the bobbin and rotate the spindle shaft slowly by hand. Roughness or grinding indicates a worn bearing.
- 4
Check the spindle shaft for run-out by placing a dial indicator against the shaft at mid-height and rotating slowly. Run-out above 0.05 mm indicates a bent shaft.[1]
- 5
Replace the spindle if the shaft is bent or the bearing is worn. Spindle replacement is a unit swap on most Rieter frames.
- 6
Inspect the bobbin for cracks or chips at the tube base. Replace damaged bobbins as they cause imbalance at high spindle speeds.
- 7
After repair, run the machine at half speed for 5 minutes and confirm the noise is gone before returning to full production speed.
Sources
Rieter Rieter G 38 / K 48 ring frame Spinning Frame (Ring / Open-End) general technical documentation, Rieter
Rieter ring spinning frame general spindle lubrication and maintenance procedures (general)
More guides for Rieter Rieter G 38 / K 48 ring frame
How to fix end breakage rate increase on a Rieter G 38 / K 48 ring spinning frame
End breakage increases are usually a traveler worn or of wrong weight, ring rail misalignment, or drafting zone pressure out of spec. Check the traveler first as it is the fastest fix.
How to fix yarn unevenness with thick and thin places on a Rieter G 38 / K 48
Yarn unevenness is most often a worn drafting apron, a damaged top roller cot, or a drafting zone setting wrong for the fiber. Check the apron and cots before changing any zone distances.
Stop fixing the same fault twice.
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