Rack System Compatibility by AGV Type
| Rack System | Compatible AGV Types | Notes |
|---|---|---|
| Selective pallet rack | All AGV types | Most common integration; laser or floor-marker guidance |
| Double-deep selective | Reach truck AGV | 100% selectivity at 2 pallets deep |
| Pallet flow rack | Unit load AGV, reach truck AGV | FIFO; lane length adds 12-24 in. for separators |
| Push-back (cart) | Reach truck AGV | 2-7 deep LIFO |
| Drive-in / drive-thru | Counterbalanced forklift AGV | Rare; requires precise guidance in enclosed rack |
| VNA rack | VNA AGV only | Wire or rail guidance in aisle required |
| Cantilever | Specialized AGV (ANSI MH16.3) | Custom interface; reference MH16.3 for design |
Structural Requirements for AGV-Compatible Racking
Underride AGV Considerations
Standard hook-and-slot beam connections can fail under upward lifting forces from underride AGVs. AGV-compatible racks require:
- Rigid bolted frame: All beams, braces, and shelves bolted with Grade 8.8+ high-strength bolts and serrated anti-loosening nuts
- Upward force rated: Rack must be engineered for the lift force of the AGV’s mechanism, not just downward gravity loads
Structural Condition Requirements
Rack must be free of:
- Bowing, sagging, or leaning uprights or beams (interferes with laser sensor detection)
- Damaged or repaired sections that create dimensional inconsistency
- Any overloaded bays that deflect beams out of tolerance
Clearance Specifications
Horizontal Clearances (Load to Upright)
- Minimum 3 inches (76mm) between the inside edge of the upright and the widest point of the pallet or load
- AGV tolerance is tighter than manned equipment: recommend increasing to 4-6 inches (100-150mm) for AGV positioning systems with ±10-25mm accuracy (SLAM)
- For laser-guided AGVs (±5mm accuracy): 3 inches may be sufficient with confirmed positional repeatability
Vertical Clearances
- Minimum vertical clearance above loaded pallet to next beam: 3-4 inches (75-100mm) standard; increase for AGV approach speed and sensor field
- Cross-aisle clearance: minimum 2% of top beam height (e.g., 20 ft top beam = 4.8 in clearance)
- Down-aisle clearance: minimum 5% of top beam height (e.g., 20 ft top beam = 12 in clearance)
Pallet Flow Lane Additions
Add 12-24 inches of lane length per bay to accommodate pallet separators and AGV stop positions.
Interface and Docking Requirements
- Access pocket locations must be consistent throughout the rack - position variance between bays defeats AGV repeatability
- Access pockets must be evenly distributed and accessible from the AGV approach direction
- Recommend device-agnostic docking interfaces (universal pocket dimensions) to avoid vendor lock-in
- Confirm pocket height matches AGV fork height at approach (loaded vs. empty fork height differential)
Upright Protection
In AGV environments, upright protectors serve two purposes: physical protection and as a reference datum for sensor calibration. Requirements:
- Protectors must not protrude into the aisle beyond the upright face
- Must withstand repeated low-speed AGV contact (typical AGV bumper speed: 0.3 m/s)
- Do not install protectors that change the reflectivity pattern visible to laser scanners
Compatible Guidance Methods by Rack Type
| Rack Environment | Typical Guidance |
|---|---|
| Open selective aisles | Laser triangulation or natural SLAM |
| VNA rack aisles | Wire guidance or rail (no room for laser correction) |
| Drive-in rack | Wire guidance only |
| End-of-aisle transfer | Floor magnetic spots or laser |
RMI and Standards Reference
- ANSI MH16.1: Standard for steel selective pallet rack (RMI)
- ANSI MH16.3: Cantilever rack design
- ANSI/ITSDF B56.5-2024: AGV safety, guidepath clearance requirements
- ISO 3691-4:2023: Driverless truck safety, restricted zone definitions
Rack Installation Tolerances for AGV Operation (Dematic, 2024)
Source-derived from vna-agv-site-readiness-specs-dematic-jungheinrich-2024. Clearances required for AGV pick/place: >= 6” load/backrest top to overhead beam, >= 6” between loads, >= 4” load side to upright. Installation tolerances tighten for tall rack (Type 1 > 6 m vs Type 2 < 6 m):
| Deviation | Type 1 (>6 m) | Type 2 (<6 m) |
|---|---|---|
| Uprights plumb | 0.0013 x height | 0.0028 x height |
| Aisle width | +/- 5 mm | +/- 10 mm |
| Wire guidepath from aisle centerline | +/- 5 mm | +/- 5 mm |
| Lowest beam to floor | +/- 2.5 mm | +/- 5 mm |
| Highest beam to floor | +/- 7.5 mm | +/- 10 mm |
Upright plumb at 0.0013 x height is ~15.6 mm total on a 12 m upright, tighter than typical FEM/RMI erection tolerance and driven purely by AGV navigation and mast reach. Lowest-beam-to-floor at +/-2.5 mm reflects fork-height registration for automated pick/place. Anchoring/seismic is deferred to the vendor proposal, not the tolerance spec.