Thread inspection of screws and tapped holes
A multi-hole flange is placed on an indexing table; an oblique camera and ring light image the bore. Bright thread-ring count and regularity are evaluated; a smooth inner wall is marked as a missing thread.
The bore image, ring count and OK/NG result appear on the display. The untapped bore is marked and the station stack light indicates NG.
- 01 Index
- 02 Acquire
- 03 Rings
- 04 Decide
The selected flange bore is presented to the camera.
- Thread rings
- —
- Bore code
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Thread crests occlude each other inside deep bores and chips can interrupt bright rings. Top-face reflections can make the rim of an untapped hole resemble a thread ring.
Solution approach
The indexing table presents the selected bore to an oblique camera view. A coaxial ring light highlights thread crests; ring count and spacing inside the bore are compared, with an untapped example shown as a smooth inner wall. On external threads, pitch and damage are evaluated from the thread profile in a side silhouette.
Process steps
- 01
Index
The selected flange bore is presented to the camera.
- 02
Acquire
The ring light illuminates the crests inside the bore.
- 03
Rings
Ring count and regularity are shown in the image.
- 04
Decide
An untapped bore or acceptable thread is reported.
Related applications
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