Bringing Bearings, Guideways and Ball Screws to Perfect Break-in: JSWAY Field Edition

2025-09-16

I. The Break-in Logic: Relax – Progress – Lock

Relax: Natural Ageing + Preload Release
• Castings are left for weeks so internal stress dissipates slowly; no "running-in under stress".
• Before assembly, guideway clamps and bearing lock nuts are loosened so guideways and screws sit at "zero stress".
Progress: No-load → Light-load → Heavy-load Ladder
• No-load high speed: low → medium → high speed, each for several hours, so rollers/balls form an even oil film.
• Light-load cutting: smaller depth and feed, gradually loading to ~50 % normal cutting force.
• Heavy-load proof: full cutting force, continuous running, monitor vibration and temperature until both plateau.
Lock: Data Benchmark + Preload Calibration
• Laser interferometer checks guideway straightness, wireless ball-bar checks circularity, data benchmarked to factory standard.
• Guideway clamps and bearing lock nuts are re-tightened to JSWAY specified torque, avoiding "too tight" or "too loose".

Bringing Bearings, Guideways and Ball Screws to Perfect Break-in: JSWAY Field Edition 1

II. On-Site "Four Listen & Three Measure" Method
• Listen to vibration: no abnormal high-frequency whistling during no-load high speed.
• Listen to oil film: no "dry friction" squeaking during light-load cutting.
• Listen to temperature rise: no sudden jumps during heavy-load proof.
• Listen to rhythm: stable cycle time, no stuttering under heavy-load continuous run.

• Measure temperature: infrared thermometer on bearing housings and slider blocks—stable rise.
• Measure vibration: wireless vibration sensor collects spectrum—no abnormal peaks.
• Measure accuracy: laser interferometer re-checks guideway straightness, benchmarked to factory standard.

Bringing Bearings, Guideways and Ball Screws to Perfect Break-in: JSWAY Field Edition 2

III. JSWAY Exclusive Tools
• Wireless vibration sensor: real-time spectrum of bearings and guideways, instant alarm on abnormal peaks.
• Infrared thermometer: detects temperature rise of bearing housings and slider blocks—stable means qualified.
• Laser interferometer: re-checks guideway straightness and ball-screw backlash, data benchmarked to factory standard.

IV. Maintenance “Two-Step Method”
• Each shift: infrared thermometer on bearing housings and slider blocks—stable rise means qualified.
• Monthly: laser interferometer re-checks guideway straightness, data benchmarked to factory standard.

V. One-Sentence Summary
Write “relax-progress-lock” into daily SOP, and let laser, temperature and vibration be the “scale” of break-in — this is the lifetime accuracy insurance JSWAY provides for your Swiss-type lathe.

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