Anodizing imparts a wear-resistant coating to cylinders. This electrochemical process permits the use of lightweight aluminum instead of heavier metals, but anodizing increases surface roughness. Moreover, anodizing increases a cylinder’s outer diameter (OD) while decreasing its inner diameter (OD). These changes in surface quality and dimensions can interfere with parts mating and sealing.     

Traditionally, manufacturers have used grinding, lapping and rigid honing to improve the surface finish of anodized aluminum cylinders. These methods have significant drawbacks, however. For example, grinding and lapping require precise machine setups. Rigid hones can remove too much material from the high points of thin coatings.

The Flex-Hone® tool from Brush Research Manufacturing (BRM) provides a better way to improve the surface finish of anodized cylinders. Setups are easier and the tool is self-aligning to the bore and self-compensating for wear. The benefits don’t end there either. To learn more, download the article from Modern Pumping Today magazine.

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