Application know-how sits with a few engineers: HR for machine vision companies

A pharma packer's blister inspection starts rejecting good strips after the customer changes its foil supplier. The application engineer who set up the system is on leave. His colleague drives to the plant and spends two days rediscovering what the first engineer knew. The new foil glares under a ring light, so the original set-up used a low-angle bar light, a polariser and a shorter exposure. None of that was recorded except on a sticky note inside the camera enclosure, long since lost.

That is the core people risk in a machine vision company. The machine vision companies page puts it first: application know-how sits with a few engineers.

• Lighting. Backlight, dome, ring, coaxial or low-angle bar, and the exact angle and distance that killed the glare.
• Optics. Lens focal length, working distance, aperture and the depth of field needed for part height variation.
• Camera settings. Exposure, gain, trigger source and encoder timing at line speed.
• Inspection tools. Regions of interest, edge tools, pattern models and the thresholds that separate a real flaw from a cosmetic mark.
• Product variation. Which batches, colours or suppliers broke the first set-up, and how it was retuned.
• Line quirks. Vibration, sunlight from a roof sheet, a conveyor that slips at start-up.

Application work is trial and error under pressure. The engineer tries a light, moves it, tries another, adjusts the exposure, gets the rejects right near dawn and goes home. Writing down the path that led there feels like extra work. Next time, the same engineer simply remembers. The firm only discovers the knowledge was personal when that engineer is unavailable.

Customer, line, product family and the variants covered.
Inspection task: presence, dimension, print, surface flaw or code reading, with pass and fail samples.
Golden and reject sample sets: storage location and keeper.
Camera, lens, filter and light, with mounting distances and angles, plus a photo of the set-up.
Exposure, gain, trigger and encoder settings at the agreed line speed.
Tool settings and thresholds, noting why each departs from default.
What failed during the study, and why it was dropped.
Retuning history: date, cause, change made and by whom.
Filled by the study engineer and countersigned by a colleague within a week of commissioning.

The record-keeping notes for vision firms describe the sheet as a standard record, held by the application engineer and reviewed by another.

1. 1

   Name the second at the application study

   The second engineer joins the first site visit, handles the sample parts and watches the lighting trials.

2. 2

   Split the work

   One sets up optics and lighting, the other writes the inspection program. Then each explains their half to the other.

3. 3

   Send the second to the first retune

   The first retuning call goes to the junior partner, with the original engineer on the phone.

4. 4

   Sign the sheet together

   Both engineers sign the application sheet. Gaps found during that first retune go straight onto it.

Candidates who understand optics, software and plant conditions all at once are rare, and waiting for one can stall projects for months. Hire for real aptitude in one area and train the others. Test candidates on a real problem. Give them a few good and bad parts, a camera and two lights, and ask how they would separate them. Watch whether they think about the light before the algorithm. The recruitment notes for vision companies set out a hiring process for these mixed-skill roles.

Customers rarely stop a running line for a vision trial during the day. Trials happen on night shifts, at weekends or in short planned stops, and the engineers who know the application are the ones who go. Over a quarter, that adds up. Book trial windows with the customer when the order is placed, share them across a rota and give rest after night work. The rota and rest guidance for vision firms covers support calls as well.

Know-how matters on the customer side too. Line operators who see false rejects without understanding why will switch the inspection off, and the supplier gets the blame. A short session on what the camera checks, why it rejects and how to handle a doubtful reject keeps the system running. Engineers explain better with practice. Communication training for vision engineers helps them describe lighting and thresholds in plain words.

Start by listing your active applications, marking the engineer who knows each well enough to retune it alone. Any application with one name needs an application sheet this month and a second engineer at its next retune. For your next new job, name the second engineer at the study stage. The industry hub places this alongside the sector's other recurring patterns.