Tangent milling and spline approximation techniques in model making

Sankar, R and Janardhan, S (1971) Tangent milling and spline approximation techniques in model making. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Wings, whose surfaces are developable, have been milled13; on a jig-borer at the National Aeronautical Laboratory, Bangalore, employing tangential milling. In this process, the wing cross section is approximated by a polygon which can be smoothened by hand-finish. The polygonal approximation itself is such that each side of the polygon is a tangent to the aerofoil. The aerofoil is defined by a finite set of points got from experiments or otherwise. These points are joined smoothly by using spline approximation to achieve continuity of first and second derivatives. The splines and the settings of the jig-borer (for tangential milling) were obtained on the NAL Sirius computer. Each setting of the jig-borer consists of the cutter-height and two turnings of the turn-table, one about the latter's axis and the other about a fixed horizontal axis, so that the tangent plane13; coincides with the plane of milling. The two angles of rotation and the cutter height depend upon the wing geometry besides some of the machine parameters.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Jig-borer;Polygon;Wing geometry;Machine parameters;Splines
Depositing User: M/S ICAST NAL
Date Deposited: 11 Dec 2006
Last Modified: 24 May 2010 04:24
URI: http://nal-ir.nal.res.in/id/eprint/3689

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