CNC Turned Bushing

Machined from bearing-grade alloy steels, tin bronzes, and high-tensile brass alloys, these guide bushings provide aligned, low-friction interfaces for reciprocating, oscillating, or sliding mechanisms. They are installed in excavator boom pivots, automotive suspension A-arm pivot assemblies, injection molding tie-bar platens, and hydraulic cylinder rod guide glands, absorbing dynamic side loads and reducing mechanical wear under mixed lubrication regimes.

When turning thin-walled bushings, radial chucking forces from standard three-jaw chucks can distort the part into a three-lobed shape, causing out-of-round bores once the part is un-clamped. Production lines use full-circumference hydraulic expanding arbors or pie-jaw workholding to distribute clamping pressure uniformly. Coupled with light floating finish boring passes, internal roundness is held to tight tolerances, ensuring smooth, bind-free pin insertion during final assembly.

To maintain continuous lubrication films under heavy oscillatory loads, CNC lathes can generate various internal oil groove patterns, including figure-eight, double helix, diamond cross-hatch, and annular reservoir channels. Grooving passes include deburring cycles to eliminate raised metal edges that could score mating pins. Mating outer diameters, internal bores, and entry lead-in chamfers are turned in a single chucking operation to preserve concentricity.

Bores are inspected using calibrated multi-jet air sizing spindles. By measuring differential back-pressure, operators can assess diameter, taper, and roundness along the full bore length down to 0.001 mm resolution. Exterior surfaces receive rust-preventative treatment, and parts are packed into cell-divided grid boxes to prevent metal-to-metal contact during shipping. Inspection records include chemical analysis and bore dimension distributions.