Abstract: An improved rotary scraper having a central rotatable hub and a plurality of scraper members pivotally attached to said hub and extending outwardly therefrom for sliding engagement with and at an angle to a work surface is provided. The scraper members each comprise a coil spring disposed about a rod formed in the hub and a pair of generally parallel equal length spring fingers extending from the ends of said coil. During rotation, the scraper members are restrained in a position at an angle to the work surface by means of one finger of each pair bearing against the spring coil on an adjacent rod disposed in the hub. The finger which is restrained by the adjacent rod is stiffer than the other finger of the pair, which is restrained only by the coil, so that the degree of scraping action can be controlled by the pressure exerted upon the hub to bring the less stiff finger or both fingers into contact with the work surface.

Abstract: An improved mandrel is provided for use with a tube-finning machine. The mandrel is mounted to a stationary arbor and supports a tubular member during a tube-finning operation. The mandrel comprises a stationary body axially mounted to the arbor and a lubricated bushing which is rotatably mounted on the body. The bushing facilitates rotation of the tubular member relative to the body and supports the interior surface of the tubular member during the finning operation.