A robot does not paint better than a good sprayer on a good day. It paints the same on every part, on every shift, for years — and that difference is what shows up in rework, in paint consumption and in the ability to hold a delivery date. It also creates work that did not exist before.
What improves
- Repeatability: gun distance, angle and speed are the same on part 1 and part 10,000. Film build variation narrows, which is what lets you reduce the safety margin you were spraying to.
- Paint consumption: a consistent path with a defined overlap does not over-spray the way a tiring operator does. How much you save depends on the applicator and the part — it is calculated from your geometry and material data, not from a brochure figure.
- Throughput becomes predictable. On one glass-bonding cell the requirement was 7.5 jobs per hour and the measured result on three models was 14, 16.7 and 17.9 — the value there was not the peak rate but knowing the rate.
- Operators leave the solvent atmosphere. That is a health and safety change with insurance and compliance consequences, not just a comfort one.
What does not change
- Surface preparation. A robot sprays a contaminated part exactly as faithfully as a clean one.
- Booth airflow and filtration. If the booth conditions were marginal for a sprayer, they are marginal for a robot — and the robot will reveal it as a consistent defect rather than a random one.
- Paint kitchen discipline: viscosity, temperature, circulation and filtration still decide the finish.
- Masking and handling, unless they are automated separately.
The new work
Programming and path maintenance become a permanent job. Every new part, every changed hanger and every new colour needs a path, and paths need fine-tuning against the real part rather than the CAD model.
We treat this as a priced item rather than a hopeful assumption. On the glass-bonding cell, on-site fine-tuning of all nine glass paths was budgeted from the start; a later paid service visit refined every path again, resolved a safety-circuit fault in automatic mode, and produced the process cards and maintenance manual the plant needed.
Maintenance also changes shape: purge air quality, hose and dress-pack wear, applicator cleaning discipline, and a spare-parts holding that matches your downtime tolerance.
How to plan the transition
- Start with the parts that dominate volume, not the hardest part in the catalogue. A pilot on one part with one robot answers more questions than a full line specified on assumptions.
- Keep a manual station for prototypes, touch-up and the long tail of low-volume variants.
- Train two people, not one. A single trained operator is a single point of failure for the whole line.
- Write acceptance criteria you can measure: film build at named points, cycle time per model, defect rate over a defined run.
Frequently asked questions
How long does commissioning take?
It depends on the number of part variants far more than on the number of robots. A single-part cell can be running in days; a cell with nine part variants needs path work on every one, and that is planned in weeks, not days.
Will I need fewer operators?
Usually the roles change more than the count: fewer people in the booth, more in preparation, handling and programming. Plan for who will own the programs before the robot arrives.
Can we keep our existing booth?
Often yes, but it must be surveyed — dimensions, airflow, filtration, hazardous-area classification and the wall or floor interface. We survey before bidding on a retrofit; PDF drawings without CAD and no air-balance diagram are a reason to visit, not a reason to assume.
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