The test radius (Rr) is a number used as an arithmetic convention established to simplify the determination of the proper test distance between a master and a work gear for a composite action test. It is used as a measure of the effective size of a gear. The test radius of the master, plus the test radius of the work gear is the set up center distance on a composite action test device. Test radius is not the same as the operating pitch radii of two tightly meshing gears unless both are perfect and to basic or standard tooth thickness.
Read more about this topic: List Of Gear Nomenclature
Famous quotes containing the word test:
“Wild roses, at your back porch, break their blood,
And bud to test surprises of sea air,”
—Howard Moss (b. 1922)