A controlled break-in phase for fresh machinery. During a run-in, components like piston rings, bearings, and gears are operated under specific loads and speeds to smooth out microscopic surface imperfections. This process seats the parts together, establishing the final clearances necessary for long-term reliability and proper lubrication.
Keep the spindle speed under half capacity until the run-in is complete.
Skipping the run-in procedure often leads to premature failure or excessive oil consumption because the parts score each other instead of polishing together smoothly.
Also heard as
- break-in
Related terms
Same word, different worlds
Operating new gears at reduced load at first so surface high spots wear smooth before full duty.
Hydrography & ChartingThe stretch before a survey line where the boat settles on course and speed before logging starts.
Printing & TypesettingTo merge text into a single continuous block to eliminate gaps or save space.