In centerless grinding, there remains the out-of-roundness, so-called a rounded regular polygon, clue to geometrical conditions of working. The influences of the center-height of the work h and the top angle of the blade θ, which are very likely to have a close relation to the phenomenon above mentioned, are theoretically studied.
The results obtained are as follows :
(1) When the center-height of the work is comparatively low, a polygon of odd number of corners is apt to be formed, and the most frequent polygon is triangle. Then pentagon and heptagon follow this.
(2) The larger the angle of blade and the moment of inertia of the work, the easier such a polygon as mentioned above is to be formed.
(3) As the work is supported higher, the polygon of even number of corners comes to appear frequently in place of that of odd number of corners. The number of corners
ne is
ne=π/γ
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