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This part is a matched left and right bearing set that supports the ball screw shaft within the mechanical scan drive of Applied Materials (AMAT) ion implantation platforms. In a beamline implanter, the wafer (or wafer batch) must be physically scanned through a stationary or partially scanned ion beam to build up a uniform implanted dose across the whole substrate. That scanning motion is delivered by a precision ball screw, and the ball screw shaft is carried at each end by a dedicated support bearing, one on the left journal and one on the right. The bearings sold under OEM P/N 3060-90120 are those end supports, supplied as a paired left/right unit so that both ends of the shaft share the same preload class and rotational characteristics.
Although a support bearing is a small component relative to the implanter as a whole, it sits directly in the kinematic chain that governs how accurately and repeatably the wafer is positioned during implant. Any radial play, axial float, or roughness introduced at the bearing journals translates almost immediately into scan-velocity ripple and positional error, which the dosimetry system cannot fully correct. For this reason the scan drive shaft bearings are treated as a precision-class consumable rather than a generic ball bearing, and they are replaced as a matched set to preserve the alignment and preload that the original assembly was built to.
ESCT supplies the left and right bearings under ES3033-025 as a fit-and-function equivalent for AMAT 3060-90120, intended to restore original scan-drive performance during planned maintenance or after a mechanical scan fault. With a typical lead time of approximately one month, the set is a sensible item to hold or pre-order ahead of a scheduled preventive maintenance window.
The left and right bearings constrain the ball screw shaft so that it can rotate freely while remaining radially and axially located. As the servo motor turns the ball screw, the recirculating ball nut converts that rotation into the linear travel that moves the scan arm or wafer carrier through the beam. The end bearings carry the resulting loads and keep the shaft true throughout each stroke. Their specific functions include:
Ball screw support bearings of this type are precision-ground rolling-element bearings, typically with hardened steel races and balls, selected for low runout and a defined preload class. Because the scan drive reverses direction continuously, the bearings see alternating thrust loads rather than a steady one-way load, so the preload must be tight enough to eliminate axial play yet not so tight that it raises running torque or generates excess heat. The matched left/right pairing means both journals present the same stiffness, keeping the shaft straight under load.
Smooth dynamic behaviour matters because the scan drive accelerates, decelerates and reverses many times during a single implant. Low and consistent running torque lets the servo loop hold velocity accurately, while clean lubrication keeps friction stable as the bearing warms. Excess friction or contaminated grease shows up as torque ripple and audible roughness, both of which compromise scan uniformity long before the bearing physically fails.
Because the scan motion directly determines how evenly dose is laid down across the wafer, degradation at the shaft bearings carries straight through to process results. A worn or rough bearing set undermines exactly the things an implanter is judged on:
The dominant failure mode is fatigue of the rolling surfaces under the continuous reversing load. Over many millions of strokes the races and balls develop micro-pitting that grows into spalling, which both roughens rotation and relaxes the preload. The result is growing backlash and runout that the servo struggles to compensate for, eventually showing as scan-uniformity drift.
Grease degrades with time, temperature and cycling, and once the lubricant film thins or dries the bearing runs metal-to-metal. Ingress of particles or outgassed residue accelerates this further. Lubrication failure raises running torque and heat, which then drives faster surface wear, a self-reinforcing decline that often precedes outright seizure.
If one bearing degrades faster than its partner, or if a journal is disturbed during service, the shaft is loaded eccentrically and the imbalance is felt at both ends. Shock loads from a hard servo fault, or improper handling during installation, can brinell the races. Replacing the pair as a matched set avoids leaving a worn bearing working against a new one.
Replacement should be carried out by a qualified service engineer following the platform’s mechanical scan service procedure, with the system in a safe, isolated state. The following sequence outlines the typical workflow:
Scan drive bearings are a wear item with a finite fatigue life, which makes them an ideal candidate for planned replacement rather than reactive repair. Holding the matched set on the shelf lets a fab fold the swap into a scheduled preventive maintenance window instead of absorbing an unplanned line-down event. Sourcing through ESCT offers several advantages:
The two bearings support opposite ends of the same ball screw shaft and must share the same preload class and stiffness to keep the shaft true. Replacing them as a matched pair avoids running a new bearing against a worn one, which would leave the shaft unevenly supported and shorten the life of the new component.
No. This bearing set is supplied as a new OEM-compatible part cross-referenced to AMAT OEM P/N 3060-90120 and verified to form, fit and function. It is not an original Applied Materials part and is not sold as one; it is intended as a compatible replacement for maintenance and repair.
Typical symptoms include audible roughness or rumble at the shaft ends, rising servo following error or torque, increased scan-position scatter, and drift in dose-uniformity results. Confirming this against ball screw, coupling and servo health during scan diagnostics helps isolate the bearings as the root cause before replacement.
In most configurations the end bearings are accessed at the shaft journals after parking and supporting the scan mechanism, without fully extracting the ball screw and nut. The exact extent of disassembly depends on the platform variant, so the relevant mechanical scan service procedure should always be followed.
The typical lead time is approximately one month. Because these are a planned wear item, we recommend ordering ahead of a scheduled maintenance window so the matched set is on hand when the scan drive is opened up.
After fitting, the preload and shaft runout should be checked, the scan axis homed, and following error, scan velocity and dose-uniformity verification performed before returning to production. This confirms the new bearings have restored smooth, repeatable motion across the full stroke.
The scan drive shaft ball screw bearing set, OEM P/N 3060-90120 (ESCT P/N ES3033-025), is a matched left- and right-hand support bearing pair for the mechanical wafer scan drive on Applied Materials ion implantation systems. By keeping the ball screw shaft concentric, preloaded and smoothly rotating under a demanding reversing duty cycle, the set directly safeguards scan accuracy and dose uniformity. As a finite-life wear item it is well suited to planned replacement, and ESCT supplies it as a fit-and-function equivalent with a typical one-month lead time to support proactive maintenance of AMAT implanter fleets.
Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Applied Materials part number 3060-90120. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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