Allied X-PREP® Precision 5-Axis CNC Milling, Grinding and Polishing System

Overview

The Allied X-PREP® is a purpose-built, 5-axis computer numerical control (CNC) milling, grinding, and polishing system engineered for high-fidelity sample preparation in semiconductor failure analysis (FA), materials science research, and advanced microelectronics characterization. Unlike conventional lapping or manual polishing systems, the X-PREP® integrates deterministic material removal via synchronized motion control across X, Y, Z, tilt (θ), and rotation (φ) axes—enabling sub-micron geometric accuracy and surface integrity preservation during cross-sectioning, beveling, trenching, and site-specific deprocessing. Its core architecture leverages closed-loop servo positioning and real-time force feedback to maintain consistent mechanical interaction between tool and specimen—critical for preparing artifact-free interfaces in stacked-die packages, through-silicon vias (TSVs), low-k dielectrics, and heterogeneous integrated circuits.

Key Features

• Wizard-driven, touch-screen GUI with context-sensitive help: Guides operators step-by-step through setup—including coordinate definition, tool path selection, feed rate, Z-force setpoint, incremental depth, and pattern overlap—without requiring prior CNC programming expertise.
• Three operational control modes: (1) Position mode (for precise milling/grinding), (2) Position-Force mode (for controlled-depth grinding/polishing), and (3) Floating Force mode (for compliant, pressure-regulated polishing of fragile or topographically complex surfaces).
• Integrated 720p HD color camera with live video overlay: Projects a magnified, distortion-corrected image onto the 12″ capacitive touchscreen, enabling pixel-accurate definition of X/Y milling boundaries directly on the specimen surface.
• Motorized 3-point tilt stage with closed-loop leveling: Automatically compensates for non-planar mounting or wafer bow; achieves 0.5 µm resolution in angular correction and enables custom plane alignment relative to the tool axis.
• High-resolution motion control: Closed-loop Z-axis positioning at 0.1 µm resolution (±1 µm absolute accuracy); X/Y axes at 1 µm resolution; programmable Z-force control from 0.5 N to 10 N with real-time feedback.
• Universal collet system: Accepts standard 3 mm shank tools up to 38 mm in length, supporting grinding wheels, diamond slurries, polishing pads, and custom-shaped probes (tip diameters: 0.25–12 mm).
• Optional 3D Software Module: Enables automated surface profiling, convex/concave deprocessing path generation, and export of height maps to Excel® for quantitative topographic analysis and macro-based profile manipulation.

Sample Compatibility & Compliance

The X-PREP® accommodates a broad range of rigid and semi-rigid specimens—from bare silicon wafers and packaged ICs (QFN, BGA, WLCSP) to ceramic substrates, MEMS devices, and metallographic cross-sections. Fixture kits include vacuum chucks, kinematic mounts, and custom jigs designed to minimize clamping-induced stress and ensure repeatable registration. The system complies with ISO 14644-1 Class 5 cleanroom compatibility when operated with optional HEPA-filtered enclosures. All motion control firmware and user interface logic are architected to support audit-ready operation under GLP and GMP environments, including timestamped parameter logging, operator ID tracking, and immutable session records—facilitating alignment with FDA 21 CFR Part 11 requirements for electronic records and signatures where configured with appropriate IT infrastructure.

Software & Data Management

The embedded software platform runs on a real-time Linux OS with deterministic I/O scheduling, ensuring jitter-free synchronization between vision capture, motor control, and force sampling (1 kHz update rate). Every preparation protocol is saved as a reusable, versioned method file—including tool geometry, Z-force ramp profiles, dwell times, and boundary polygons. Raw positional and force data streams are logged in CSV format with nanosecond-precision timestamps. The optional 3D module adds HDF5-compatible binary export for integration with MATLAB®, Python (NumPy/SciPy), or commercial metrology suites. No G-code generation or external CAM software is required—geometry definitions occur natively within the GUI using intuitive point-and-click or drag-to-draw tools.

Applications

• Controlled-depth trenching and cross-sectioning of advanced packaging structures (e.g., fan-out wafer-level packaging, 2.5D/3D IC stacks)
• Beveling of die edges for optical inspection and FIB-SEM site access
• Site-specific deprocessing of interconnect layers without damaging underlying metallization
• Preparation of TEM lamellae via sequential milling and low-angle polishing
• Surface planarization of brittle ceramics or compound semiconductors prior to EBSD or nanoindentation
• Reproducible fabrication of calibration standards for profilometry and AFM traceability

FAQ

Does the X-PREP® require external air or coolant supply?

No—the system operates with dry machining by default; optional recirculating coolant modules are available for extended tool life during high-MRR operations.
Can the X-PREP® be integrated into an automated FA workflow with SEM or FIB-SEM tools?

Yes—Ethernet/IP and Modbus TCP interfaces enable bidirectional communication with third-party metrology and imaging platforms for coordinated stage handoff and recipe synchronization.
Is training and technical support included with purchase?

Allied provides on-site installation, two-day operator certification, and remote application engineering support for the duration of the 24-month warranty period.
What maintenance intervals are recommended?

Linear guide lubrication every 500 operating hours; spindle bearing inspection annually; camera lens and optical path cleaning after each high-dust application.
Are consumables such as grinding wheels and polishing pads supplied by Allied?

Yes—Allied offers a full catalog of ISO-certified diamond-impregnated wheels, alumina and silica-based polishing suspensions, and electroplated tooling optimized for silicon, copper, low-k dielectrics, and solder alloys.