In machining and fabrication, this defect occurs when a drill bit wanders off center or chatters during the cut. It can also happen in welding when the weld pool collapses and leaves an oblong gap. The resulting flaw ruins the tolerance of the workpiece and usually requires filling, re-drilling, or scrapping the part entirely.
Heard on the job
Feed that bit slower through the sheet metal or it will keyhole and ruin the mounting bracket.
Also heard as
- keyholing