The BIG EYE B-52 provides 52" (1320mm) maximum cutting capacity with an 85-1/4" front rail, while the BIG EYE B-36 offers 36" (914mm) maximum cutting capacity with a 69-1/4" front rail. Both systems feature identical fence assemblies (41-3/8" overall length), precision mechanisms, and compatibility specifications. The B-52 weighs 68 lbs net versus 62 lbs for the B-36. Choose based on your table saw's maximum rip capacity requirements and available workspace.

The BIG EYE revolutionizes rip fence design through two major innovations: the Dual-Axis Linear Guide Rail System with eight precision bearings on hardened steel rods provides zero-clearance movement accuracy within 0.15mm (0.006") throughout full travel, while the Synchronized Dual-End Locking Mechanism simultaneously secures both fence ends with a single action, eliminating deflection. Traditional T-square fences suffer from sloppy rail guiding, cantilever deflection, and structural displacement from locking forces, requiring multiple "trial and error" cuts to achieve precision.

The BIG EYE is compatible with table saws meeting the following criteria: cast iron worktable construction, table width 685-800mm (27-31.5"), guide rail mounting holes 8-12mm diameter positioned 26-29mm from tabletop, and T-slot depth ≤10mm. Compatible brands include SawStop, Powermatic, JET, Laguna, Grizzly, Harvey Alpha series, and other professional table saws with cast iron tables. Minor modifications may be required for some models.

Yes, the fence assembly can be installed on either side of the saw blade. To switch sides: lower the blade below the table surface, move the fence assembly to the other side, then remove and reinstall the fence locking knob, fence, and fence locking block on the opposite side. The high/low fence plate can also be mounted on either left or right side of the fence body for additional versatility.

Installation typically requires 3-4.5 hours with a two-person team and basic hand tools. The process involves removing existing fence components, installing front and rear guide rails with proper height positioning, mounting the extension table, installing the connecting rod assembly, and calibrating the fence assembly. Detailed step-by-step instructions are provided. While the process is straightforward for mechanically inclined woodworkers, professional installation is recommended for optimal results and warranty compliance.

Most table saws with through-holes on the rear mounting surface allow direct installation. However, some models require drilling and tapping three M6 threaded holes on the main table's rear mounting surface. For table widths between 690-795mm, the included rod sleeve must be shortened (length = 800mm minus table width). If mounting surfaces are not perfectly level, wedge-shaped adjustment shims may be needed. All necessary drill bits, taps, and instructions are included.

The BIG EYE accommodates table widths from 685-800mm through the rear locking support adjustment system. A pointer indicates table width; loosen four M5x12 screws and four M5x6 set screws on the rear locking support, move it until the pointer aligns with your table width, then tighten. For widths 685-690mm, install the included rod sleeve. For widths 690-795mm, modify the rod sleeve length according to the formula: 800mm minus your table width.

The BIG EYE delivers exceptional precision through multiple mechanisms: movement accuracy within 0.15mm (0.006") throughout full rail length via the dual-axis linear guide system, locked position accuracy within 0.02mm (0.0008") through synchronized dual-end locking, and micro-adjustment capability for fine-tuning. The K9 crystal glass viewing window with 92% light transmittance ensures accurate scale reading with minimal parallax error, while imperial scales provide 1/32" resolution and metric scales provide 1mm resolution.

K9 crystal glass is an optical-grade material (silica-based) with 92% light transmittance, exceptional hardness, and superior durability. It provides minimal parallax error when reading measurements, ensuring accuracy from various viewing angles. The high transparency and scratch resistance maintain clear scale visibility over time, while the professional-grade material resists wear better than standard plastic or acrylic viewing windows found on traditional fence systems.

The synchronized dual-end locking mechanism connects the front and rear clamping systems through a linkage mechanism, allowing a single action on the top-mounted locking handle to simultaneously secure both ends of the fence to the guide rails. This eliminates the cantilever deflection and body drift common in traditional fences that lock at only one point. With 300N load capacity and accuracy maintained within 0.02mm (0.0008") when locked, the system prevents fence displacement during cutting operations.

The dual-axis linear guide rail system features eight precision roller bearings (four fixed, four adjustable) gliding on hardened, ground steel rods with zero clearance. This design replaces traditional bushing sliding friction with smooth rolling friction, resulting in effortless fence movement with exceptional accuracy (0.15mm throughout full length). The adjustable bearings eliminate gaps between bearings and steel rods, maintaining parallelism between fence and blade while enabling clearance-free gliding motion even in dusty environments.

The micro-adjustment knob is an intuitive hand roller positioned on the fence assembly. To make fine adjustments, simply rotate the micro-adjustment knob with your fingers to shift the fence with precision and ease. The eccentric shaft mechanism must be properly calibrated using a 4mm hex wrench to ensure smooth operation that moves the fence without slippage. This feature is ideal for achieving exact dimensions without unlocking and repositioning the entire fence.

The BIG EYE includes four built-in flip position stops designed to streamline fence positioning for repetitive cutting tasks. In the DOWN position, they act as fixed reference points for the fence; in the UP position, they allow free movement. To adjust position stop location, use a 4mm hex wrench to loosen the M6 screw, move the stop to your desired location along the guide rail, and securely tighten. Take care to avoid excessively bumping into the stops during operation.

Daily maintenance includes dust removal from T-slots and guide rails, visual inspection of locking mechanisms, and surface cleaning with a dry cloth. Weekly tasks involve checking perpendicularity and parallelism, inspecting hardware tightness, and verifying flip position stop security. Monthly maintenance includes bearing inspection, eccentric nut adjustment verification, lubrication of moving parts, and accuracy testing. The hardened steel guide rods and anodized aluminum construction minimize maintenance requirements while the felt seals protect bearings from dust contamination.

Bearing replacement requires: 1) Remove fence body by loosening six M6x20 screws and two M6x8 set screws, 2) Remove rear locking knob and outer shell, 3) Extract locking swing arm and front locking block seat, 4) Remove support blocks and copper bushings, 5) Take out handle upper block, 6) Extract handle assembly, 7) Use flathead screwdriver to remove handle pins and slide out handle shaft, 8) Replace old bearing with new 6003-2Z (GB/T 276) bearing. Clean all components and reassemble in reverse order. Apply rust inhibitor regularly to prevent future corrosion.

Window replacement procedure: 1) Prepare new scale viewer and clean with anhydrous ethanol, 2) Heat damaged window's edges with heat gun until adhesive loses stickiness (caution: part temperature is very high after heating), 3) Remove damaged window, 4) Clean viewer installation area on slider with anhydrous ethanol, 5) Apply UV adhesive to installation area following adhesive manufacturer's instructions, 6) Affix new viewer ensuring proper alignment and no air bubbles. Handle carefully to avoid damaging the precision viewing window.

Perpendicularity calibration: First verify front and rear guide rails are positioned 11.5mm below table surface. For minor deviations, use included copper shims (0.05mm thickness each) placed in slider groove—each shim layer corrects approximately 0.05mm. Stack shims as needed on left or right side. Parallelism adjustment: After installing fence body with six M6x20 screws pre-tightened, use two M6x8 set screws for fine-tuning (left screw adjusts clockwise, right adjusts counterclockwise). Complete calibration by fully tightening M6x20 screws first, then M6x8 set screws.

For movement difficulties or wobbling: 1) Remove magnetic sealing cover from slider, 2) Loosen three set screws on eccentric nut, 3) Use 8mm hex wrench to rotate eccentric nut until roller contacts guide rail, 4) Tighten three set screws on eccentric nut, 5) Repeat adjustment for all four eccentric nuts, 6) Test fence movement for smooth operation without binding or play, 7) Reinstall sealing cover. This adjustment restores zero-clearance operation between bearings and hardened steel guide rods.

Safety features include: top-mounted locking handle eliminating leg collision risk from traditional lower-positioned handles, synchronized dual-end locking preventing fence displacement under 300N load capacity, flip safety stops at both rail ends preventing accidental slide-off, felt seals and covers protecting bearings from dust contamination, K9 crystal viewing window providing clear visual confirmation of positioning, and anti-deflection design maintaining accuracy during heavy cutting. The system integrates with standard blade guards, riving knives, and push stick safety practices.

Achieve consistent cuts through: using the laser-etched imperial or metric scales visible through K9 crystal viewing window, setting flip position stops at frequently used dimensions, utilizing micro-adjustment knob for fine-tuning, verifying fence locks securely with synchronized dual-end mechanism, maintaining perpendicularity and parallelism calibration, documenting successful setups for future reference, and ensuring fence positioning accuracy remains within 0.02mm (0.0008") when locked. Regular calibration verification maintains optimal performance.

Proper operation: 1) Verify blade guard or riving knife is properly installed, 2) Position fence to desired dimension using scale or flip position stops, 3) Fine-tune with micro-adjustment knob if needed, 4) Lock fence by pushing down top-mounted locking handle, 5) Verify fence is secure with gentle test pressure, 6) Use push stick to feed workpiece against fence, maintaining proper hand distance from blade, 7) Allow blade to reach full speed before cutting, 8) Feed workpiece at appropriate rate without forcing, 9) Unlock fence by lifting handle when repositioning needed.

The BIG EYE excels at rip cutting operations for various widths up to the system's maximum capacity (52" for B-52, 36" for B-36). The high/low fence configuration accommodates thick and thin wood cutting. When slid forward of the blade, the fence can assist with cross-cut positioning without kickback risk. However, cross-cutting operations should still utilize the miter gauge with the rip fence moved away to prevent binding. The system's five T-slots allow mounting custom accessories and jigs for specialized operations.

The connecting rod assembly reinforces both guide rails against flexing caused by fence clamping pressure, maintaining consistent parallel alignment throughout the rail length. By adjusting the connecting rod's rotation, you can fine-tune front and rear guide rail parallelism. The assembly connects via eccentric screws in the T-slots of both rails and adjusts via left/right lead screws to match exact table width. It may be omitted if a router table is installed on the far right of your table saw.

The BIG EYE features five T-slots: two on each side of the fence body and one on top, providing extensive customization capability. These T-slots include pre-designated mounting notches simplifying installation. Standard T-slot dimensions ensure compatibility with universal accessories. You can attach featherboards, stop blocks, measuring devices, hold-downs, dust collection attachments, or custom-built jigs. Refer to the technical drawings for precise T-slot dimensions when selecting or fabricating mounting hardware.

The high fence configuration is designed for cutting thick wood, providing greater support and control for heavy material. The low fence configuration is optimized for thin wood operations, reducing the risk of workpiece instability. Switching between positions is effortless using the sliding scale system—simply loosen the fence locking knob, slide out the fence, rotate it 180 degrees, and reinsert. The scale must be repositioned to align with the appropriate "HIGH" or "LOW" stop for accurate measurements in each configuration.

Scale stop calibration procedure: 1) Use 2mm hex wrench to loosen two M4 set screws on scale stop, 2) Move stop away from scale and retighten, 3) Position fence in high setting and move until it contacts blade, 4) Slide scale until red line on viewer aligns with zero, 5) Move "HIGH" stop against scale and secure, 6) Repeat process with fence in low setting to position "LOW" stop. Critical: Do not move fence assembly while M4 set screws are loosened to prevent damaging the K9 crystal viewing window.

Insufficient locking force solutions: For front locking, raise handle and use 6mm hex wrench to adjust screw inside outer shell—loosen fully counterclockwise, then turn clockwise until noticeable resistance, finally rotate counterclockwise approximately 60 degrees (1/6 rotation). For rear locking, raise handle, completely loosen M6 set screw, turn rear locking knob counterclockwise to disengage, rotate clockwise until resistance, turn counterclockwise approximately 45 degrees (1/8 rotation), and secure M6 set screw while preventing knob rotation.

The guide rail top surface must be positioned exactly 11.5mm below the table working surface. This critical dimension ensures proper bearing engagement and fence operation. Verify using a precision measuring tool at multiple points along the rail length. The three eccentric screw orientation positions accommodate different mounting hole distances: approximately 29mm (position a), 27.5mm (position b), or 26mm (position c) from tabletop. Incorrect guide rail height will cause fence operation difficulties and may damage components.

Yes, Harvey Woodworking maintains comprehensive parts support including locking handle bearings (6003-2Z GB/T 276), K9 crystal viewing windows, felt seals and dust covers, copper shims for calibration, complete hardware kits, replacement scales (both imperial and metric), safety stops, and all major components. This ensures long-term serviceability and system longevity. Contact Harvey Woodworking customer service or authorized dealers for replacement parts and technical support.

Harvey Woodworking provides a limited two-year warranty from date of purchase covering defects in materials and craftsmanship. The warranty covers repair or replacement of defective parts at no additional charge when serviced by Harvey or authorized service professionals. Exclusions include normal wear and tear, consumable parts, abuse/misuse/neglect, lack of proper maintenance, use of non-genuine parts, unauthorized repairs or modifications, and damage from force majeure, fire, or explosion.