Not every coating job needs six axes. A reciprocator moves a bank of guns in a straight line and covers flat, conveyorised work extremely economically. The interesting cases are the ones where a plant uses both.
The comparison
| Reciprocator | Six-axis robot | |
|---|---|---|
| Motion | One linear axis, guns sweep across the part | Full six-axis path, any approach angle |
| Best for | Flat panels, uniform parts, outer faces | Contoured parts, recesses, interiors, mixed programmes |
| Changeover | Gun spacing and stroke settings | A program per part |
| Cost | A fraction of a robot cell | Robot, controller, safety, programming |
| Paint use | Higher overspray on non-flat parts | Path follows the part, less waste |
Where they are combined
On an engineered powder-coating line for electrical cabinets, reciprocators with four guns per side coat the outer faces while a single robot coats the interiors and hard-to-reach areas — with a 3D laser camera identifying the cabinet type and generating the robot path, because 3 to 24 mixed parts hang on the same 3 m beam.
That split is the general rule: the reciprocator takes the area, the robot takes the difficulty. Buying a robot to sweep a flat panel is paying for five axes you will not use.
How to decide
- Measure what fraction of the coated area is genuinely flat and presented square to the guns. If it is most of it, start with reciprocators.
- Count the part variants. Reciprocators handle variety through gun spacing and stroke; robots handle it through programs — and programs need someone to maintain them.
- Check the recesses. Any face a gun cannot see from the sweep line is robot work or manual work.
Frequently asked questions
Can a reciprocator handle colour change?
Yes, through the same colour-change stack and gun hardware; the difference is motion, not fluid handling.
Is a robot always better quality?
On a flat panel, a well-set reciprocator gives an extremely even film. The robot's advantage appears where the part stops being flat.
What about vision-guided path generation?
It exists and works — one proposal used a 3D laser camera to identify the cabinet and generate the path without teaching. It earns its cost where the part mix is genuinely random.
Request a quote Send drawings and we check the selection before quoting.