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The Scan Drive Shaft Ball Screw Lower Bearing is a precision rolling-element bearing that locates and supports the lower end of the ball screw assembly within the mechanical wafer scan drive of Applied Materials (AMAT) ion implantation systems. In Quantum and xR-class implanters, the scan drive is responsible for translating the wafer (or wafer carriage) through the stationary ion beam so that the implanted dose is distributed uniformly across the substrate. The ball screw converts the rotary motion of the scan motor into the controlled linear travel that defines this mechanical scan, and the lower bearing constrains and stabilises the shaft at the end opposite the drive coupling.
Although it is a comparatively small component, the lower bearing carries out a disproportionately important job. It fixes the axial and radial position of the ball screw shaft, absorbs the thrust loads generated as the nut reverses direction at the ends of every scan stroke, and keeps the screw running true so that the linear position reported back to the implanter’s motion controller corresponds faithfully to the real position of the wafer. Any looseness, roughness or runout introduced here is transmitted directly into the scan trajectory.
Because the scan drive operates under continuous reversing duty (accelerating, decelerating and changing direction thousands of times per production shift) the bearings that support the ball screw are wear items. The lower bearing in particular sees repeated thrust reversal and is a recognised candidate for preventive replacement during scan-mechanism overhaul. Sourcing a correct, in-specification replacement keeps scan uniformity within limits and protects the far more expensive ball screw and motion components above it.
Within the scan drive mechanism, the lower bearing is one half of a bearing pair that supports the ball screw shaft. Its role is to constrain the shaft precisely while allowing it to rotate with minimal friction, so that the screw can drive the wafer carriage smoothly and repeatably through the beam. Its principal functions include the following:
A ball screw support bearing of this kind is built to combine high running accuracy with the ability to carry combined radial and axial load. The hardened steel inner and outer races and precision ground balls are manufactured to tight tolerance classes so that runout stays low and the screw turns concentrically. Correct internal geometry is what keeps the bearing quiet and smooth across the full speed range of the scan drive.
In a reversing ball screw application, correct preload matters: it removes internal play so the shaft cannot shuttle axially when the scan changes direction. The bearing’s lubricant (typically a clean, low-particulate grease suited to continuous reciprocating motion) protects the contact surfaces and damps micro-vibration. Both preload and lubrication degrade over service life, which is why this is a maintained, replaceable item rather than a fit-and-forget part.
The mechanical scan defines how evenly dose is spread across each wafer, so the health of the scan drive bearings feeds directly into implant uniformity and, ultimately, device yield. A bearing that is worn, rough or losing preload will compromise the tool in several ways:
Repeated thrust reversal concentrates contact stress on the same race zones, and over many millions of cycles this produces classic rolling-contact fatigue, surface spalling and pitting of the raceways. Hard stops or shock loading can also leave indentations (brinelling) in the races. Both conditions show up first as roughness and rising vibration before the bearing becomes noisy and binds.
Continuous reciprocating duty churns the grease and can drive lubricant away from the contact zone, while heat ages the base oil. Once the lubricant film thins, metal-to-metal contact accelerates wear, and any ingress of particulate contamination embeds in the races and abrades them. Loss of lubrication is one of the most common reasons a scan drive bearing turns rough early.
As the races and balls wear, the carefully set preload relaxes and internal clearance opens up. The shaft is then free to shift axially at each scan reversal, introducing lost motion and backlash into the ball screw drive. This degrades positional repeatability and is frequently the trigger for following-error or scan-uniformity alarms long before the bearing seizes outright.
Bearing replacement should be carried out by a qualified technician following the appropriate AMAT service procedure for the scan drive on the specific tool, with the system powered down and locked out. The following sequence outlines the typical approach:
Scan drive bearings are low-cost, high-consequence items: a single worn bearing can take an implanter offline and put a lot at risk. Holding verified replacements on the shelf turns an emergency into a planned maintenance task. ESCT Fab Support offers a number of advantages for sourcing this part:
It supports and locates the lower end of the ball screw shaft in the mechanical wafer scan drive, reacting the axial thrust generated as the scan reverses and keeping the screw running true so the wafer is moved smoothly and repeatably through the ion beam.
No. This bearing is supplied as a new, OEM-compatible replacement that is cross-referenced to AMAT P/N 3060-90076 and verified to form, fit and function. It is not an original OEM-branded part and is not sold as such.
Typical signs include increased scan-drive noise or vibration, rough or notchy rotation when turned by hand, rising scan-motor current, and motion faults such as following-error or scan-uniformity alarms caused by backlash from lost preload.
Bearings in a support pair age together under the same duty, so many maintenance teams choose to replace the upper and lower bearings together during a scan-drive overhaul. The correct scope depends on the AMAT service procedure for your specific tool and the condition found at inspection.
After replacement you should re-establish the specified preload and run the scan drive through its motion and position-feedback checks, confirming smooth travel and scan uniformity before returning the tool to production. Always follow the AMAT procedure for the relevant system.
The typical lead time is approximately one month. Because this is a recognised wear item, we recommend holding a spare to convert a potential emergency breakdown into a scheduled maintenance event.
The Scan Drive Shaft Ball Screw Lower Bearing (AMAT P/N 3060-90076, ESCT P/N ES3033-004) is a precision rolling-element bearing that supports the lower end of the ball screw in the mechanical wafer scan drive of AMAT Quantum and xR-class ion implanters. By locating the shaft, reacting scan-reversal thrust and keeping the screw running true, it directly underpins scan smoothness, positional repeatability and dose uniformity. As a wear item subject to fatigue, lubricant breakdown and preload loss, it is an ideal candidate for proactive spares stocking, and ESCT Fab Support provides a verified, cost-effective replacement with a roughly one-month lead time.
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 3060-90076. 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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