SKF
Machinability of Composite Materials
SKF composite plain bearing materials can be machined using standard workshop tools for custom dimensions or to achieve precise running clearances after installation. PTFE-based composites are readily turned, milled, and reamed. POM-based materials require sharp tools to avoid melting. SKF provides recommended cutting speeds, feed rates, and tooling sharpness standards. This allows maintenance shops to adapt bushings to non-standard shaft sizes or to calibrate bores after press-fitting. Machinability is an important design flexibility that standard rolling bearings cannot offer.
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Turnable and Millable
PTFE and POM composites cut easily with carbide tools.
Reaming for Precision
Bushing bore can be reamed to exact final size after press‑fitting.
No Coolant Required
Most composites machine dry, keeping the workplace clean.
Chip Handling
Controlled chip formation; avoids stringy swarf common with metals.
Tool Life
High‑speed steel or carbide tools have good life; sharp edges prevent delamination.
De‑burring
Light chamfer recommended to remove sharp edges without fraying.
Shop‑Floor Procedure for Machining a Thrust Washer from Plate
Clamp the composite plate on a mill bed, use a sharp end mill, and follow the recommended feed rate. Cut the OD and ID to match the shaft and housing. De‑burr lightly with a scraper. The machined thrust washer is ready to install — no curing or post‑processing required.
Reaming a Composite Bushing to Fit an Oversized Shaft
After press‑fitting a composite bushing, the bore may shrink. SKF recommends reaming to the final size using a sharp, slow‑helix reamer. The reamer should be guided by a pilot to ensure concentricity. This on‑machine sizing eliminates the need to stock bushings for every shaft tolerance.