ACE Angle Compensation Receiver for Excavator & Backhoe Fleets
The Apache Bullseye 6 (ATI991320-02) is a professional-grade laser machine display receiver engineered specifically for excavation and trenching operations where dipper arm angle constantly changes. Traditional receivers require manual grade corrections every time the arm moves — the Bullseye 6 eliminates that entirely with ACE (Angle Compensation for Excavation) technology, automatically recalculating grade in real time as the arm swings between fully extended and retracted positions up to ±30°. The result is faster cycle times, fewer grade errors, and a significant reduction in rework on every dig.
Overview & Jobsite Applications
Designed for excavator and backhoe operators working in utility installation, foundation excavation, pond and retention basin construction, and finish grading, the Bullseye 6 mounts directly to the dipper arm and communicates with a rotating laser transmitter already established on site. Its large, high-visibility LED display gives the operator instant cut/fill feedback from inside the cab without requiring a grade checker on the ground. Whether you are running a fleet of machines on a large earthmoving project or a single excavator on a residential utility cut, the Bullseye 6 delivers the precision and speed that keeps jobs on schedule.
Key Specifications
- Model / SKU: Apache ATI991320-02
- Laser Compatibility: 635–680 nm red and 780 nm infrared rotating lasers
- ACE Angle Compensation Range: ±30° dipper arm angle correction
- Detection Window Height: 6 inches (152 mm)
- Display Type: Large dual-sided LED grade indicator panel
- Accuracy: ±1.5 mm at 10 m under ACE correction
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
- IP Rating: IP66 weatherproof — dust-tight and water jet resistant
- Power: Internal rechargeable battery with USB-C charging port
- Mount: Universal dipper arm bracket with tool-free adjustment
- Plumb Indication: Built-in vertical reference for machine attitude checks
Key Features
- ACE Technology: Automatic grade compensation as dipper arm angle changes — no manual input required from operator
- Dual-Sided LED Display: Visible from cab and from the ground simultaneously for crew coordination
- One-Button Operation: Simplified controls reduce operator learning curve and distraction
- Broadband Laser Reception: Accepts both red and IR laser signals for compatibility across major laser brands
- IP66 Weatherproof Housing: Sealed against rain, dust, and muddy jobsite washdowns
- Plumb Reference Indicator: Verify machine and receiver vertical alignment independently of the laser
- USB-C Rechargeable Battery: Eliminates AA battery costs and reduces downtime for battery swaps
- Universal Mounting Bracket: Fits most excavator and backhoe dipper arm profiles with no special tools
Job Applications
Utility Trench Excavation: Maintain consistent pipe-bed grade on sewer, water, and conduit trenches as the arm extends into the cut without stopping to re-check grade manually.
Foundation & Footing Excavation: Hit design depth on spread footings and continuous foundations in fewer passes, reducing over-excavation and costly backfill.
Retention Pond & Drainage Basin Grading: Hold precise slopes on large earthen basins where the arm angle changes dramatically across the work face.
Road Subgrade Preparation: Work alongside motor graders and compactors to bring subgrade to design elevation quickly and accurately before base aggregate placement.
Compatible Accessories
- Apache Replacement Dipper Arm Mounting Bracket
- Apache USB-C Fast Charge Cable & Field Charger
- Apache Bullseye 6 Protective Transport Case
- Rotating Laser Transmitters Compatible with Bullseye 6
Related Guides
- How to Set Up a Rotating Laser for Excavator Grade Control
- ACE Technology Explained: Angle Compensation for Excavation
- Choosing the Right Machine Receiver for Your Excavator Fleet
- Laser vs. GPS Machine Control: Which Is Right for Your Project?
Frequently Asked Questions
- Does the Bullseye 6 work with my existing rotating laser transmitter?
- The Bullseye 6 is compatible with most major-brand rotating lasers operating at 635–680 nm (red) or 780 nm (infrared) wavelengths. This covers the majority of grade lasers from Spectra, Topcon, Leica, and Trimble. If you are unsure about compatibility with a specific transmitter model, contact our team at Express Tools before ordering.
- What does ACE angle compensation actually do on the jobsite?
- When your dipper arm angle changes as you dig — from fully extended at the bottom of a cut to retracted near the machine — the receiver's mounting angle relative to the laser beam changes. Without ACE, the display would show a false grade reading. The Bullseye 6 uses an internal inclinometer to measure the arm angle and mathematically correct the laser intercept in real time, so the display always shows true cut or fill relative to design grade regardless of arm position.
- How is the Bullseye 6 mounted to the excavator?
- The receiver ships with a universal dipper arm bracket that clamps to the arm using standard hardware. No welding or permanent modification is required. The bracket adjusts to fit most arm profiles and can be transferred between machines in the fleet. Alignment and tilt adjustments are made by hand with thumb screws for fast setup.
- What is the battery life and how is it charged?
- The internal rechargeable battery provides a full shift of operation — typically 10 to 12 hours — on a single charge. Charging is handled via the integrated USB-C port, compatible with standard USB-C power adapters and power banks. A full charge takes approximately 3 hours. The receiver will also display a low-battery warning well before shutdown so operators are not caught off guard mid-shift.
Frequently Asked Questions
Does the Bullseye 6 work with my existing rotating laser transmitter?
The Bullseye 6 is compatible with most major-brand rotating lasers operating at 635–680 nm (red) or 780 nm (infrared) wavelengths. This covers the majority of grade lasers from Spectra, Topcon, Leica, and Trimble. If you are unsure about compatibility with a specific transmitter model, contact our team at Express Tools before ordering.
What does ACE angle compensation actually do on the jobsite?
When your dipper arm angle changes as you dig — from fully extended at the bottom of a cut to retracted near the machine — the receiver's mounting angle relative to the laser beam changes. Without ACE, the display would show a false grade reading. The Bullseye 6 uses an internal inclinometer to measure the arm angle and mathematically correct the laser intercept in real time, so the display always shows true cut or fill relative to design grade regardless of arm position.
How is the Bullseye 6 mounted to the excavator?
The receiver ships with a universal dipper arm bracket that clamps to the arm using standard hardware. No welding or permanent modification is required. The bracket adjusts to fit most arm profiles and can be transferred between machines in the fleet. Alignment and tilt adjustments are made by hand with thumb screws for fast setup.
What is the battery life and how is it charged?
The internal rechargeable battery provides a full shift of operation — typically 10 to 12 hours — on a single charge. Charging is handled via the integrated USB-C port, compatible with standard USB-C power adapters and power banks. A full charge takes approximately 3 hours. The receiver will also display a low-battery warning well before shutdown so operators are not caught off guard mid-shift.
