Airtac LGC Series Cross Roller Guide Rail LGC6R8
The AirTAC Airtac LGC Series Cross Roller Guide Rail LGC6R8 is a crossed roller guide using Ø6.0 mm precision rollers. Rollers are held in a cage in alternating orientation between hardened V-raceways, giving line contact instead of point contact — much higher rigidity and accuracy than a ball guide of similar size. It does NOT recirculate, so travel is set by rail length and the cage travels about half the stroke.
- SeriesLGC
- Supplied asRoller cage assembly (spare part)
- SizeLGC6
- Roller diameterØ6.0 mm
- Rollers in cage8
About the Airtac LGC Series Cross Roller Guide Rail LGC6R8
Order code LGC6R8 identifies a spare roller cage for the AirTAC LGC size 6 crossed roller guide, carrying 8 rollers of 6.0 mm diameter in alternating crossed orientation. This is the non-recirculating heart of the guide: because the rollers never recirculate, the cage itself walks along the rail as the slide moves, which is why a complete guide's travel is limited by its rail length rather than being unlimited. The form matters when ordering - this item is NOT a rail and NOT a complete guide, and no rail is supplied with it.
Per roller, the ratings are 3175 N dynamic and 2550 N static; the smaller static figure is characteristic of crossed roller guides and catches out buyers used to ball guides, where static is the larger number. With only 8 rollers, this cage suits lighter duties within size 6 than the higher-count cages, since total capacity scales with the number of rollers rather than being a fixed per-guide value we publish. If a cage drifts under vibration, eccentric loading or high acceleration, running several full strokes re-centres it; on a vertical axis, keep stroke margin because gravity accumulates the drift one way.
Airtac LGC Series Cross Roller Guide Rail LGC6R8 Technical Specifications
| Model | Airtac LGC Series Cross Roller Guide Rail LGC6R8 |
|---|---|
| Series | LGC Series Crossed Roller Guide |
| Supplied as | Roller cage assembly (spare part) |
| Construction | Crossed precision rollers in a cage, NON-recirculating, line contact |
| Size code | LGC6 |
| Roller diameter | Ø6.0 mm |
| Rollers per cage | 8 |
| Rail material | Stainless steel |
| Travel | Limited by rail length — the cage travels about half the stroke |
| Basic dynamic load rating C | 3175 N per roller |
|---|---|
| Basic static load rating C0 | 2550 N per roller |
| Mounting screws | Per catalogue tightening-torque table |
| Lubrication | Per catalogue; adjust clearance and preload before use |
| Interchangeability | LGC carriages fit LGC rails of the same model, matched by the pairing code |
Specifications follow the official AirTAC LGC catalogue. Load ratings are stated PER ROLLER, not per guide — total capacity depends on how many rollers the cage carries, which is why the roller count is part of the order code. Maximum stroke and tightening torques are given in the catalogue tables; ask us for the figure for your size. This item is a roller cage only — neither a rail nor a complete guide.
Model Code: Airtac LGC Series Cross Roller Guide Rail LGC6R8
| LGC | LGC Series Crossed Roller Guide. |
|---|---|
| 6 | Size code — sets the roller diameter (Ø6.0 mm). |
| R8 | Cage carrying 8 rollers. |
| -H / -P | Accuracy grade: H high, P precision. |
What Is In The Box
| This order | Roller cage assembly (spare part) |
|---|---|
| Rail | No — not supplied with this item |
| Rollers and cage | Yes, 8 rollers |
This is the cage-and-rollers subassembly sold as a spare. It is NOT a rail and NOT a complete guide. If you are not sure which form you need, send us the machine or the original part number and we will confirm it before you order.
Where the Airtac LGC Series Cross Roller Guide Rail LGC6R8 Is Used
Recalibrating a compact measuring stage
A workshop coordinate measuring fixture with a short, lightly loaded slide can be brought back to full accuracy by replacing its worn size 6 cage and re-running the dial-indicator adjustment on the original matched rails.
Repairing a semiconductor inspection head
Inspection heads move millimetres, not metres, and need rigidity over speed. An 8-roller cage replacement during a head repair restores line-contact stiffness without touching the precision-adjusted rail set.
Restoring a lens alignment jig
Optics assembly jigs rely on short, stiff slides for lens alignment. A spare cage on the shelf turns a drifted or damaged roller set from a rebuild into a same-morning swap and re-adjustment.
Is the Airtac LGC Series Cross Roller Guide Rail LGC6R8 the Right Guide?
Start with the form: LGC6R8 is a cage-and-rollers spare, not a complete guide, so new builds need complete LGC guides ordered as matched sets. Match the replacement cage to the size code by roller diameter AND the roller count of the original cage together, then confirm the row arrangement (A three-row or B four-row) and rail length of the parent guide, taking the length from the maximum-stroke table and setting the working stroke shorter than the maximum. Complete guides are stocked in grade H; grade P can be ordered. Decide the clearance and preload route early - adjusting screws for ordinary clearance, a pressure plate where rigidity and accuracy matter, a taper block for the highest - because it changes the surrounding machining. Fitting is done in place with a dial indicator, so allow build time for that adjustment. When long travel or a sealed recirculating carriage is what you actually need, move up to LSH; when the duty is light and space tight, LRM fits better than a size 6 cage guide.
Quick checklist
- ✓ Complete set, carriage only, or rail only?
- ✓ Worst-case moment, not just straight load
- ✓ Travel length and mounting space
- ✓ Stroke shorter than the rail allows for cage travel
- ✓ Clearance method: screws, plate or taper block
- ✓ Pairing code, if replacing a part
Installation & Maintenance Notes
- check Mounting surface must be ground or finish-milled.
- check Torque the rail screws per the recommended figures, in sequence.
- check Keep the mounting corner radius inside the stated R maximum.
- check Centre the roller cage on the rail during assembly.
- check Adjust with a dial indicator over the full stroke.
- check Never mix rails from different sets — accuracy is matched per set.
- check Installation by qualified personnel per AirTAC docs.
Airtac LGC Series Cross Roller Guide Rail LGC6R8 FAQ
Size 6 cage, 8 rollers of 6.0 mm diameter, dynamic rating 3175 N per roller and static rating 2550 N per roller. Rail length, row type and accuracy grade do not belong to a cage code - they are specified when ordering the complete guide it serves. Because capacity scales with roller count through load distribution and contact angle, we do not publish a per-guide total; ask us and we will size it for the actual duty.
LGC is non-recirculating, so the roller cage travels with the slide by about half the stroke - this is normal, not a fault. Drift can be caused by high speed, acceleration, eccentric loads, vibration, misaligned rails or uneven preload, and on vertical axes gravity makes it accumulate. Running the slide through several full strokes brings the cage back near centre; if drift recurs often, replace the cage and check the mounting rigidity and rail alignment.
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