KOYO – Precision Ball & Roller Bearings focuses on high‑precision bearings for spindles and positioning axes. It covers ISO/ABEC accuracy classes, contact angles, preload systems (universal pairing DU/DB/DF/DT), limiting speeds and thermal growth management. Practical guidance compares steel vs. ceramic balls, grease vs. oil‑air lubrication and spacer arrangements to reach micron‑level runout with stable stiffness.
Content overview
- Contact angles, preload classes and universal pairing schemes.
- ABEC/ISO precision, runout limits and thermal management.
- Steel vs. ceramic balls; grease vs. oil‑air lubrication.
- Dynamic capacity, speed ratings and stiffness curves.
How to use
- Define accuracy, stiffness and speed targets.
- Choose series/contact angle; select preload (DU/DB/DF/DT).
- Plan lubrication and cooling (oil‑air, jet, grease).
- Validate runout and temperature in trial runs.
Best practices
- Heat inner rings—never press through rolling elements.
- Match thermal growth of shaft/housing to keep preload.
- Keep assembly clean; filter lubrication lines.
- Monitor vibration enveloping and ball‑pass frequencies.
Download: KOYO – Precision Ball & Roller Bearings
