Focus across height
Control the focal plane over stepped, sloped or curved marking areas.
Curved, stepped and variable-height parts
3D fibre laser marking for curved surfaces
Maintain focus and mark geometry across complex components using the right combination of dynamic focus, rotary movement, fixtures and part-location control.
Geometry-led specification
Choose between a rotary axis, 3D focus control or coordinated handling.
Short answer
A 3D fibre laser uses dynamic focus control to move the focal position across different heights or a modelled surface. A rotary fixture is often more suitable for a cylindrical part that can be turned. The correct method depends on geometry, mark coverage, cycle time and how repeatably the part can be located.
Cylinders, tapers, castings, stepped housings and freeform parts create different focusing and distortion challenges. Oxford Traceability assesses the marking area, height change, curvature and loading method before selecting the optical and mechanical approach.
Discuss your marking requirementReduced distortion
Compensate artwork placement for the intended three-dimensional surface.
Repeatable location
Use fixtures, sensors or vision so the physical part matches the marking program.
Flexible automation
Combine dynamic optics with rotary axes, robots or indexed handling where needed.
3D optics or rotary axis
The simplest robust method is usually the best production method.
A round component with a mark wrapped around its circumference may suit a rotary chuck. A cast housing with several height levels may suit 3-axis dynamic focus. A robot may be justified where several faces or positions must be presented to the laser.
- Rotary marking for cylindrical parts
- Dynamic focus for height variation
- Distortion correction for modelled surfaces
- Robot presentation for multiple faces
- Fixed nests for repeatable part datum
APPLICATION CHECKSupply a 3D model where possible.
A model, drawing and representative part help establish the surface envelope, datum, access and collision constraints before a trial.
Control and verification
Confirm that the correct surface and program meet in the cell.
A capable optical system cannot compensate for the wrong component, inconsistent seating or uncontrolled orientation. Part detection, recipe management and pre- or post-mark vision can be added where mix-up prevention or code quality matters.
- Component and orientation detection
- Recipe selection from barcode or PLC
- Height or focus checking
- Post-mark code reading
- Result logging and reject handling
APPLICATION CHECKDefine the datum and tolerance.
Share allowable mark-position error, surface-height variation and part-to-part variation so the location method can be proven.
Specification questions
Select the most practical route for the geometry
Use these points to compare suppliers and trial evidence on the same basis.
Part or marking needLikely approachKey trial question
Cylindrical part, wraparound markRotary fixture or coordinated rotary markingCan the part rotate without run-out or obstruction?
Stepped or sloped surface3-axis dynamic focusIs the height range inside the optical working envelope?
Several separate facesIndexed fixture or robot presentationCan each face be located within cycle time?
Variable casting geometryDatum fixture plus sensing or visionIs production variation compatible with the mark tolerance?
All curved-surface applications are assessed using the real part geometry, marking envelope and production datum; a 3D model alone does not replace a physical process trial.
Direct answers
Questions buyers ask about this application
We will test your parts and help convert the required result into a practical machine specification.
Call 01865 36278501What is a 3D fibre laser marking machine?+
It uses dynamic focus control to adjust the focal position across varying heights or a defined three-dimensional surface while the galvo system applies the programmed mark.
02Do cylindrical parts always need a 3D laser?+
No. A rotary fixture is often the simpler option when a cylindrical component can be held and rotated accurately. The marking coverage and cycle decide the best approach.
03Can a 3D laser mark an uneven casting?+
Potentially, provided the surface variation, part datum and optical working range are understood. Representative castings should be trialled, including expected production variation.
04Can vision locate the mark automatically?+
Vision can help identify a feature or orientation, but the achievable correction depends on camera view, calibration, part variation and the required positional tolerance.
Technical content reviewed by the Oxford Traceability application team
Start your marking trial
Tell us what needs a permanent identity.
Share the material, mark content and production rate. We will help you define the right fibre laser marking system.