Two-zone belt edge sanding · Applied by Titan
A manual belt edge-sanding platform for MDF, white wood, primer and sealer work. Its divided slotted belt carries two separate 100 mm abrasive-brush zones, pneumatic height selection moves between them at a switch, and a 30 mm oscillating stroke improves media use—putting coarse preparation and fine finish control at one compact workstation.
The actual production problem
Raw fibre removal, white-wood preparation and intercoat sanding need different abrasive behaviour. ROBA Duplex keeps two processes installed and presents them on one flat oscillating belt face.
Raw MDF or white wood may need decisive fibre removal, while primer or sealer needs a much finer touch. Rebuilding one conventional sanding tool between those jobs turns a small edge task into setup time.
ROBA Duplex divides one slotted belt into two vertically selectable sanding zones so coarse and fine brush populations can remain installed together.
When the process concentrates contact on a small curved zone, the operator must constantly manage pressure and guidance to avoid a visibly uneven edge.
The Duplex belt provides a broad flat working face. The part is pressed against the sanding belt rather than guided around a cylindrical brush, supporting flat, wave-controlled edge preparation.
Abrasive wear and repeated work in one fixed track can create directional marks or use only a narrow portion of the installed sanding media.
The belt aggregate oscillates continuously through a 30 mm stroke to distribute use and soften the visibility of repeated sanding marks.
Furniture doors, stair components, tabletops and tall drawer or box parts bring very different support and working-height demands.
Standard Duplex, Twin Duplex, Duplex XL and 350 and 400 mm sanding-area variants let the application determine access, work area and staffing.
Application fit
The strongest fit is repeatable edge work that benefits from a broad belt face, two persistent abrasive configurations and a workstation sized to the actual part envelope.
A strong fit where exposed or profiled MDF edges need repeatable fibre removal and preparation before primer or paint. The selected abrasive zone follows the actual edge shape and coating route.
Joinery and stair work can use the broad belt face for controlled edge preparation when species, grain, end-grain response and final finish have been proven together.
The fine abrasive zone can support denibbing and intercoat preparation without removing the coarse zone from the machine. Cure, film build and edge exposure define the acceptable pressure and abrasive build.
Furniture-door producers can qualify the standard working arrangement, while 350 or 400 mm sanding-area versions are available for high box and drawer components.
Finished edge first
Configure from the accepted coated edge backward through material, geometry, incoming defect, zone assignment, abrasive build, work support and contact method.
Use matched raw, accepted and rejected parts. Name the fibre, scratch, flatness or coating defect and define what must change without rounding the profile or cutting through the film.
The belt zones, oscillation, worktable, extraction, lighting and inspection standard are selected as one edge process.
Prove the longest, tallest and most delicate edge—not only the easy sample.
Separate MDF, solid wood, primer and sealer families. Record species, edge construction, cure and the removal limit each can tolerate.
Define straight runs, profiles, corners, end grain, inside details, length, height and the operator support needed to hold the part consistently.
Assign coarse preparation and fine denibbing deliberately. K120 above and K240 below is an example of two-zone flexibility, not a mandatory pairing.
Define workpiece support, presentation, pressure, travel, passes and inspection. The flat belt face and oscillation help, but repeatability still depends on a released method.
Inspect scratch, flatness, fibre removal, corner condition and coating breakthrough, then apply the normal primer, sealer or topcoat before releasing the process.
Machine architecture
The divided belt, replaceable 100 mm brush populations, pneumatic height change and constant oscillation turn coarse and fine edge processes into selectable workstation states.
The sanding belt is divided and slotted. One 100 mm brush population is inserted from above and another from below, allowing two abrasive configurations to remain available on the same machine.
The abrasive material, grit and support are selected from the edge and finish trial.
The upper 100 mm zone can carry the more aggressive or first-stage configuration. MB illustrates K120 at the top for coarse sanding, but the correct setup is application-specific.
The lower 100 mm zone can carry a finer or coating-oriented configuration. MB illustrates K240 for lacquer sanding as one example—not a universal recipe.
A switch actuates pneumatic lifting between the upper and lower sanding areas. The operator changes the active process zone instead of stopping to replace the complete abrasive population.
The belt unit oscillates continuously through a 30 mm stroke. It spreads contact across the sanding media and reduces the visibility of a fixed sanding track.
The workpiece is supported at the table and presented to a broad sanding-belt face. The operator does not have to steer the edge around a cylindrical brush.
Workpiece support, guarding, dust collection and approved technique remain part of the selected machine.
Technical configuration
The ROBA Duplex architecture defines the two-zone sanding system, 30 mm oscillation and major workstation variants. Final electrical, extraction and output requirements are confirmed for the selected configuration.
Throughput strategy
Part retrieval, support, presentation, zone selection, passes, rotation, inspection, abrasive state and finish yield determine sustained output.
Time representative families from staging through every required edge and final acceptance.
Twin Duplex capacity is measured with the real two-operator flow—not assumed to be exactly twice a single station.
Recipe engineering
Each family names the incoming edge, abrasive build, active zone, presentation method and coated acceptance standard.
Tie every approved method to material, geometry, coating condition and the result required after the next step.
Record abrasive, grit, support, installed direction and the defect the upper or coarse zone is responsible for removing.
Give the second zone a distinct fine-sanding or coating-preparation job with its own breakthrough limit.
Document support, working height, edge orientation, travel, pressure, passes and the treatment of corners or end grain.
A new substrate, coating, geometry, abrasive build or machine condition receives a representative first-off inspection.
Link visible defects, touch-up and coating failures to the active zone, abrasive identity, wear state and method revision.
Usage by surface
MDF, wood, primer and sealer each receive their own abrasive support, contact method and rejection limit.
Qualify the coarse zone against machining texture, then prove the prepared edge under the actual primer and topcoat.
Species, moisture, grain direction and final colour define the brush support and contact method.
Use a fine, controlled process that removes the defect without exposing substrate or changing profile definition.
Cure and film build govern the safe window. Final acceptance comes after the normal next coating stage.
Guides, tips and techniques
This application framework supports qualified industrial teams and does not replace MB operating, service or safety documentation.
Bring the shortest, longest, highest and most difficult edges, including inside or profiled details if they belong to the application. Include raw, accepted and rejected coated samples so the process has a visible target.
Do not install two grits without defining why. Zone A might remove machining fibre while Zone B prepares primer or sealer. A released process states the input defect, expected change and rejection limit for each zone.
A long tabletop, stair component, cabinet front and tall drawer create different leverage at the belt. Select the table and variant from the full workpiece envelope, then standardize how the operator supports and presents each family.
The 30 mm oscillation improves media utilization and helps blur fixed sanding marks, but it does not replace correct abrasive selection, controlled contact or wear tracking.
Before using the pneumatic selector, verify part family, intended zone, abrasive identity, extraction and inspection standard. Keep the two-zone labels visible and consistent with the released method.
Flatness loss, a repeated track, insufficient fibre removal, corner rounding and coating breakthrough point to different process reviews. Correct the underlying condition rather than masking every symptom with more passes.
Track abrasive condition by zone, material, coated appearance and workload. Replace before wear exports extra labour to finishing, and reapprove any substitute abrasive construction.
Maintenance follows MB documentation for belt condition, oscillation, pneumatic movement, work support, extraction and safety devices. Internal service and energy isolation remain trained, authorized work.
Deployment sequence
Baseline today’s burden, prove two distinct sanding zones, select the correct machine geometry and protect the accepted method.
Record sanding time, abrasive changes, setup, touch-up, coating defects, handling and difficult part families.
Build coarse and fine configurations, qualify the complete edge range and inspect after the next finish stage.
Match standard, Twin, XL or tall-part geometry to work area, staffing, handling and required output.
Prepare tables, staging, lighting, extraction, abrasive storage, inspection, training and exception routing.
Control zone identity, abrasive revisions, first-off checks, maintenance and downstream finish feedback.
Deployment strategies
Choose standard, Twin, XL or tall-part configuration from handling, access, finish and good-output evidence—not model hierarchy alone.
A compact single-position edge-sanding station for joinery, stair parts, furniture doors and mixed edge work where fast switching between two abrasive zones removes repeated setup.
The Twin Duplex makes the belt accessible from both sides and uses two worktables so two operators can work at the same time when the required capacity and part flow justify it.
ROBA Duplex XL provides an approximately 1,950 mm work area for long parts such as tabletops. The 350 and 400 mm sanding-area versions address high drawers and box components.
Business-case framework
Include setup, handling, coating rework, abrasives, dust control, training and the station architecture required for repeatable accepted parts.
Measure present belt or brush changes, staging, machine adjustment and the handling time needed to move between coarse and fine edge processes.
Include primer repair, sealer breakthrough, visible sanding tracks, recoating and remakes—not only minutes saved at the sanding station.
Use demonstrated brush materials, grits, support and replacement intervals for the actual MDF, wood and coating mix.
Standard, Twin, XL and tall-part variants change staffing, work support and output. The business case uses accepted parts per paid hour, not belt speed alone.
Application package
Representative parts, finish data and site constraints create the abrasive, variant and acceptance basis.
Complete at quotation
Your complete ROBA Duplex proposal confirms the selected standard, Twin, XL or tall-part configuration; table and work area; minimum and maximum part envelope; motor and installed power data; electrical supply; compressed air; extraction; both 100 mm abrasive-zone formats; machine footprint and weight; operating and service clearances; approvals; options; and expected output for your exact application.
It also defines the 30 mm oscillation and pneumatic zone-selection functions, workpiece support, controls, guarding, connection points, commissioning, training, representative edge acceptance, first-pass-yield basis, abrasive spares, maintenance and technical support as one coordinated workstation.
ROBA Duplex FAQ
The selected proposal supplies exact power, utilities, dimensions, abrasive package and output basis.
ROBA Duplex is designed for MDF, white wood, sealer and primer edge sanding in joinery, industrial, stair and furniture-door production.
Its divided slotted belt carries two separate 100 mm sanding-brush populations, allowing two abrasive processes to remain installed together.
A switch controls pneumatic lifting between the upper and lower abrasive areas, avoiding a complete belt setup change.
No. K120 above and K240 below is an example pairing for coarse and lacquer sanding. The actual abrasive package is qualified from the application.
The sanding unit oscillates through a 30 mm stroke.
It spreads use across the sanding media and helps blur marks that could result from working in one fixed track.
A higher-capacity version with belt access from both sides and two worktables, allowing two operators to work simultaneously.
A long-workpiece version with an approximately 1,950 mm work area for parts such as tabletops.
Duplex versions with 350 and 400 mm sanding areas are available for high workpieces and box components.
Motor power is confirmed for the selected configuration. Sustained output is established from a representative timed part trial with accepted finish yield.
ROBA Duplex application review
Share the longest, tallest and most finish-critical edge, plus the coarse and fine processes it needs. That information defines the Duplex variant, two abrasive zones, work support, utilities, demonstrated output and acceptance plan.
