All smaller rollers (in the Redi-Rail®, Integral-V™, V-Guide, Commercial Rail, Hardened Crown Roller families, and smaller diameter Hevi-Rail® bearings) are lubricated for long life. No additional lubrication is necessary. The rollers are sealed (or shielded) against the operating environment to prevent egress of lubricant and ingress of contaminants. Some larger rollers (i.e. Hevi-Rail family) are supplied with a grease access point and can be re-lubricated using a zerk fitting.
To ensure long life, it is always necessary to have a thin film of lubrication on the Raceway/Railway . When properly applied, lubrication:
- Reduces wear
- Reduces stress on the contact surfaces
- Reduces friction (and therefore heat buildup)
- Allows for operation at specifications in this catalog (de-rating is required for un-lubricated applications)
- Helps protect the metal surfaces against corrosion (rust and fretting corrosion)
Technical, environmental, ecological and economic factors will determine whether oil or grease should be used in an application. One of the most significant factors in the lubrication selected is the environmental conditions. If extreme conditions are expected, it is highly recommended that either PBC Linear or a representative from a lubrication company is consulted. This includes heavy contamination, when the expected particle size is smaller than 0.1 mm (0.005 in) as small particles can more easily bypass seals and wipers.
Our metric series Redi-Rail product line has expanded
All metric Redi-Rail sizes now have a 4-wheel and 5-wheel carriage option. These product extensions will potentially offer:
- greater design flexibility
- higher load ratings
- substantial cost-savings
Read our Redi-Rail Slider Carriage Load Capabilities blog for more detailed information on increased load capacities, or download the CRT Product Catalog to find specifications on all Redi-Rail products.
CAUTION! The compatibility of lubricants must always be checked. This check should be done under both static and dynamic conditions and within the operating environment. Some lubricants may have unexpected, negative reactions with the plastics, elastomers or non-ferrous metals within the products. It is possible to draw upon previous and practical experience or guidelines from the lubricant manufacturer. When in doubt, consult the lubricant manufacturer.
PBC Linear guides and raceways are shipped with a preservative lubrication applied to the raceway. During installation, it is necessary to apply additional lubrication. Provided there are no application conflicts, PBC recommends high quality lithium soap grease as the initial lubricant. This grease should be applied to the entire raceway, not just the portion used during normal operation. Oil or grease may be used for re-lubrication.
Note: coated/plated rails, Commercial Rail, Hardened Crown Roller and Hevi-Rail rails are typically shipped without any preservative lubrication. See the Hevi-Rail section for more details (sandblast and lightly oiled options are available for Hevi-Rail).
Periodic Maintenance Lubrication
The lubrication interval is dependent on many operating and environmental conditions, such as load, stroke, velocity, acceleration, mounting position/orientation, type of lubrication used, temperature, humidity, UV exposure, etc. The actual lubrication interval should be determined by tests conducted under actual application conditions.
While the actual lubrication intervals are application specific and determined only through testing, the following guidelines can typically be used as a starting reference point under "normal" conditions:
- Re-lubrication every 1,000 km; 50,000 cycles or six months (whichever occurs first).
Oil Filled Polymer Lubricator
Some PBC Linear products offer a high-quality polymer lubricator. PBC uses an advanced, oil filled porous polymer which has been tested to show better performance and longer life than similar wiper/lubricators made of oil or grease filled felt. In some applications, this special lubricator will last the life of the application without additional re-lubrication.
This lubricant within the polymer is NSF Registered for both H1 and H2 applications (direct and indirect contact with food). It can also be used for wash down and industrial applications. The lubrication within the polymer contains corrosion inhibitors, antioxidants and extreme pressure (E.P.) additives. Table 1, below, shows some specific properties for the lubricant.