Journal of Materials Processing Technology 186 (2007) 279–283 Analysis of the surface roughness of tangential turn-milling for machining with end milling cutter Vedat Savas ∗ , Cetin Ozay University of Fırat, Faculty of Technical Education, Department of Machine Education, 23119 Elazı˘ g, Turkey Received 8 March 2005; received in revised form 20 August 2006; accepted 1 September 2006 Abstract This paper presents a performance assessment of rotary end milling at the tangential contact. With this shape of the contact, process has been more stable. At the last decade due to the fact that cutting tools have a quenching problem, Turn-milling has been developing in manufacturing technology for processing hard steels, where in both the workpiece and the tool are given a rotary movement simultaneously. Thus, cutting edges have a time for quenching. The objective of present work is to investigate process of tangential turn-milling for machining of workpieces with in the normally available range of speed and feeds to explore its advantages. The investigations have been laid mainly on surface roughness and timing process. The experiments have been conducted for tangential turn-milling of mild steel workpiece. © 2006 Elsevier B.V. All rights reserved. Keywords: Turn-milling; Surface roughness 1. Introduction The turn-milling is a relatively new concept in manufacturing technology, where in both, the workpiece and the tool, are given a rotary movement simultaneously. This process can be broadly classified into co-axial turn-milling and orthogonal turn-milling [1]. Co-axial turn-milling in which the axes of the cutter and the workpiece are parallel to each other, and orthogonal turn-milling in which the axes of the cutter and the workpiece are perpendic- ular to each other. Co-axial turn-milling is suitable for internal as well as external machining of rotationally symmetrical work- pieces. Orthogonal turn-milling can be used external machining of rotationally symmetrical workpieces. This new technology opens up new ranges in the manufacturing processes. Recently, efforts have been made to substitute the grinding process with all its problematic strain by methods with geometrically defined cutting edges. It has been observed that high speed turn-milling is suitable for the precision machining of rotationally symmetrical workpieces. Hence, when rotationally symmetrical workpieces are to be manufactured, high speed turn-milling can be alterna- tive to grinding. ∗ Corresponding author. E-mail address: vsavas@gmail.com (V. Savas). With high speed turn-milling, high cutting speeds can be achieved by utilizing the cutting speeds of tool and the work- piece. Therefore, the advantages of high speed machining, such as high surface quality, low thermal stress and low cutting forces can be achieved. In addition, good cheep removal can be achieved due to their short length. Hence, turn-milling is a new prospective technology for the production of precise rotationally symmetrical workpieces. Shaw et al. [1] have discussed a novel lathe-type cutting tool in the form of a disc that may be rotated about its central axis. Such a rotary tool is found to correspond to an equiva- lent oblique tool. The rotary tool used by the authors has the following advantages: 1. It provides a rest period for the cutting edge, thus enabling the edge to be cooled and the adsorbed film on the tool surface to be replenished between cuts. 2. It enables the relative chip velocity to be increased to pro- vide a lower coefficient of friction without necessitating a corresponding increase in the metal removal rate. According to Venuvinod et al. [2], the rotary tool takes the form of a frustum of a cone. The experiments conducted by them showed that with a proper selection of rotary speeds, extraordi- nary effects on the cutting process are observed, e.g., reduction 0924-0136/$ – see front matter © 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.jmatprotec.2006.09.040