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POLYLUBE^® Guide Rod Bushings are designed as replacements for traditional metallic guide rods bearings and are a straightforward change-out. Typically replacement is driven by one or more factors:

• Improved stick-slip properties
• Optimal frictional response during cycling
• Significant reduction in shaft scoring
• Extension in the bearing life
• Reduction in bearing profile
• Greatly improved side load/misalignment capacity
• Increase in load capacity of bushing
• Enhanced corrosion resistance
• Tolerance of more cost effective shaft finishes
• Lower in weight

ID seal configurations

Incorporating T-lip wiper seals, radial shaft seals, o-rings or any other similar internal sealing system is not a problem for PolyLube Guide Rod bearings. Polygon's internal fabrication capabilities allow for easy and economical incorporation of ID features required to install common sealing systems.

Two liner thicknesses are available in the standard PolyLube PTFE tape lined bushing configuration: the 0.015" thick liner being standard and a 0.030" thick liner also being available for applications where seal geometry might require the introduction of a thicker liner to accommodate a unique ID feature. The 0.030" thick liner can also be used in applications where boring the ID might be required in order to achieve tighter tolerances in an effort to address sizing and minor misalignment conditions.

Fabrication capabilities

One common fabrication detail seen on guide rod bearing applications deal with corner radiuses on internal and external grooves. Because Polygon uses a diamond wheel or groove tool to form the grooves we need to have at least a .015-.020" corner radius. When threads are used there is usually clearance involved. When assembled with the mating part the bearing could shift to one side or the other impacting the location of the bearing surface in relation to the piston shaft. This could have a negative impact on wear.

The only other fabrication issue commonly seen on incoming prints is a surface finish called out on the internal diameter. This is typically related to an OEM's historical use of machined bronze bushings in the application. Since the bronze is machined from a solid piece or casting, the surface finish is called out since it is related to the speeds and feeds of their fabrication process. The wear surface on PolyLube bearings are not machined so the surface finish call out can be removed from fabrication requirements.

Polygon is capable of holding a TIR I.D. to O.D. within .002" and straight diameters to +/-.0005".

POLYLUBE^® Guide Rod Bearings are commonly available in two configurations: a POLYLUBE^® bearing utilizing a sintered PTFE or a PTFE fabric liner. The most common is the sintered, which provides two primary performance enhancements: Frictional response under start-up conditions and the transfer of PTFE to the wear surface.

PolyLube Guide Rod bearings are manufactured by a filament winding process that results in a continuous fiberglass filament backing ensuring excellent mechanical properties (especially fatigue resistance). The filament wound fiberglass structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high strength backing permits the use of a thin wall (1/16" to 1/8") bearing which can often reduce the size and weight of the finished bushing assembly. This family of materials exhibits exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F).

Visit our website for more

• Full Guide Rod Bearings listing at PolygonComposites.com.
• Download a Design Guide or other literature.
  
• View our standard parts list and request a quote.
• Ask a question or request a custom quote.