UNPARALLELED LTD is one of the leading manufacturers and suppliers of precision granite z-axis base in China. With abundant experience, we warmly welcome you to buy advanced precision granite z-axis base made in China here from our factory. We also accept custom orders.
Product description
A precision guideway begins with a stable structure
In ultra-precision equipment, a motion stage cannot outperform the structure supporting it. Even when a system uses a high-resolution encoder, direct-drive motor, premium controller, and carefully selected air-bearing pads, the final result still depends on the straightness, stiffness, and long-term stability of the guideway assembly.
The UNPARALLELED® Custom Vertical Granite Air Bearing Guideway is engineered for this critical role. It is a made-to-order granite structure for vertical motion systems, Z-axis modules, optical inspection equipment, metrology machines, laser systems, and other applications where a moving carriage must travel smoothly along a stable and accurately prepared reference surface.
The product shown features a heavy granite base, a vertical granite guideway face, a central through-slot, multiple mounting locations, and leveling support. This architecture gives machine builders a practical way to integrate a carriage, air-bearing pads, encoder scale, linear motor, sensor brackets, cable routing, safety stops, and optical modules within a compact footprint.
Its purpose is simple but important: provide a dependable granite reference structure so that your motion system has a better chance of delivering the accuracy it was designed to achieve.
Air bearings use a thin pressurized gas film to separate the moving bearing surface from the guide surface. This creates non-contact motion with very low friction and no traditional rolling-element contact. In a typical air-bearing stage, the working air gap is only a few micrometres; guide-surface condition and system geometry therefore have a direct effect on performance.renishaw
Designed for vertical and Z-axis precision motion
This custom granite air bearing guideway can be used as a structural and geometric reference for:
- Vertical air-bearing stages
- Z-axis precision positioning systems
- Optical inspection and camera-scanning machines
- Laser focusing and laser-processing equipment
- Semiconductor inspection and handling equipment
- Vision measurement machines
- Coordinate-measuring and metrology modules
- Linear-motor-driven vertical carriages
- Non-contact sensor positioning systems
- Precision assembly, alignment, and calibration machines
- Compact optical instruments and laboratory automation equipment
The visible central slot can be designed for the specific functional needs of the motion system. In a vertical application, it may provide space for an encoder scale, cable carrier, motor connection, counterbalance mechanism, pneumatic routing, vacuum tubing, or a protected mechanical interface between a moving carriage and a lower assembly.
quality control
Technical specifications
This is a custom-engineered precision granite component. Final dimensions, mounting features, guideway geometry, and acceptance criteria are established in accordance with the approved drawing and the required inspection method.
| Item | Customizable specification |
|---|---|
| Product name | Custom Vertical Granite Air Bearing Guideway |
| Product type | Precision granite guideway, granite Z-axis base, vertical granite motion structure |
| Main material | UNPARALLELED® high-density black precision granite |
| Structural configuration | Upright granite guideway with granite base; custom single-piece or assembled structure |
| Motion orientation | Vertical, inclined, horizontal, or hybrid configuration according to machine design |
| Typical application | Z-axis air bearing stages, optical inspection, laser systems, metrology, semiconductor equipment |
| Bearing interface | Lapped granite bearing surface for customer-specified air-bearing pads or guide elements |
| Guideway surface | Precision ground and/or hand-lapped functional surface, as specified |
| Surface flatness | Defined by functional face, component size, motion travel, and agreed measurement method |
| Straightness | Defined according to required travel length and agreed inspection plan |
| Parallelism | Available between selected datum faces or guide surfaces |
| Perpendicularity | Available between base datum and vertical guideway face |
| Mounting features | Threaded inserts, embedded steel inserts, drilled holes, dowel holes, counterbores, slots, pockets, reference pads |
| Central slot | Custom length, width, depth, through-slot, blind slot, or multi-slot configuration |
| Encoder integration | Encoder-scale mounting face, readhead bracket interfaces, cable clearance, reference-mark locations |
| Drive integration | Interfaces for linear motors, voice-coil drives, counterbalance systems, brackets, and stops |
| Air system integration | Air-bearing mounting faces, pneumatic passage interfaces, external air-connection provisions, custom air-management features |
| Support system | Adjustable leveling feet, steel frame, interface plate, vibration-isolation option, or customer-defined mounting arrangement |
| Inspection | Flatness, straightness, squareness, hole location, surface finish, and geometry inspected as agreed |
| Documentation | Dimensional inspection report, material-related documentation, and agreed quality records |
| Delivery condition | Machined granite component, granite assembly, or integration-ready structure according to purchase order |
For air-bearing systems, the guide surface is a functional precision element rather than an ordinary machine surface. Application guidance notes that local flatness should be related to the designed air gap, and that seams or steps in the guideway should be carefully controlled or avoided where the bearing must cross them.
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Key advantages
Granite structure for air-bearing compatibility
Precision granite is a practical material for guideway structures because it can be machined, ground, and lapped into stable functional surfaces. In air-bearing applications, granite guide faces are commonly used as the precision reference surfaces over which air-bearing elements travel.euspen
Custom vertical layout for compact machines
A vertical guideway saves footprint and allows optics, probes, sensors, or precision tools to approach a workpiece from above. The shown L-shaped configuration combines the vertical guide face and lower base into one integrated mechanical reference structure.
Prepared for system integration
The assembly can be designed with the interfaces your machine actually needs:
- Air-bearing pad mounting locations
- Linear-motor magnet track or coil interfaces
- Encoder-scale mounting surfaces
- Readhead bracket locations
- Cable and hose passages
- Dowel holes for repeatable assembly
- Threaded inserts for optical modules and protective covers
- Reference pads for calibration or alignment
- Mechanical stop and safety interface locations
Geometric accuracy where it matters
Not every granite surface needs the same tolerance. We work with customers to identify functional datum surfaces, travel faces, mounting faces, and optical references. This makes it possible to focus precision grinding and inspection on the geometry that affects machine performance.
Stable support for optics and metrology
In a vertical optical system, the relative position of the camera, lens, laser head, measurement probe, and workpiece cannot be treated as an afterthought. A custom granite guideway gives these components a consistent mechanical framework, helping equipment builders reduce uncertainty during assembly, adjustment, and calibration.
Designed from your drawing
You can start with a complete 2D/3D design, but you do not have to. A concept drawing, travel requirement, load condition, interface sketch, or existing machine layout can also be enough to begin an engineering discussion.
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FAQ
Is this a complete air-bearing stage?
The pictured product is primarily a custom precision granite guideway structure. It can be supplied as a granite component or as part of a larger granite assembly. Air-bearing pads, carriages, motors, encoders, controllers, air-preparation units, and other motion components can be integrated only according to the agreed project scope.
Can this guideway be used for a Z-axis?
Yes. The upright configuration is well suited to vertical or Z-axis motion. However, Z-axis designs must account for moving mass, center of gravity, acceleration, braking, safety stops, counterbalance requirements, and retention in the event of air-supply interruption.
Can you make the air-bearing surface directly on granite?
Yes, the relevant granite guide surface can be precision ground and hand-lapped according to the required geometry and surface condition. The final air-bearing interface must be reviewed together with the bearing-pad design, loading arrangement, air-gap requirement, and travel length.
Can you add threaded inserts, mounting holes, and dowel holes?
Yes. We can provide threaded inserts, steel inserts, dowel holes, counterbores, slots, pockets, and custom mounting features. Please specify thread size, hole depth, insert material, pull-out requirements, location tolerances, and the parts that will be mounted.
What straightness can you achieve?
The achievable straightness depends on guideway length, structural geometry, working-surface width, tolerance zone, inspection method, and application requirement. Share the travel length and target tolerance, and we will evaluate manufacturability and propose a suitable inspection plan.
Can the central slot be changed?
Yes. The slot can be modified in length, width, shape, depth, and location. It can be made as a through-slot, blind pocket, cable passage, encoder clearance, or other custom functional feature.
Is granite suitable for optical and semiconductor equipment?
Precision granite is widely used in metrology, precision positioning, CMM-related equipment, optical measurement, and integrated granite motion architectures. Granite-based systems can serve as stable structural references for components such as rails, optical modules, motors, and encoder hardware.
Do you provide inspection reports?
Yes. We can provide dimensional inspection reports based on the agreed acceptance criteria. These may cover selected dimensions, hole locations, flatness, straightness, squareness, parallelism, surface condition, and other customer-specified characteristics.
Can you provide a support frame or leveling feet?
Yes. The guideway can be supplied with leveling feet, an interface plate, a steel support frame, or a custom mounting arrangement. The support-point arrangement should be determined according to the final structure and the required geometric stability.
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