Title: High-speed internal-thread cutting using a thread mill: with and without a pilot hole

Authors: Jun Matsunoshita; Shota Matsui; Toshiki Hirogaki; Ryo Matsuda

Addresses: Graduate School, Doshisha University, 1-3 Tatara-Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan ' Department of Mechanical Engineering, National Institute of Technology, Kisarazu College, 2-11-1 Kiyomidai-Higashi, Kisarazu-shi, Chiba 292-0041, Japan ' Department of Mechanical Engineering, Doshisha University, 1-3 Tatara-Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan ' Research and Development Group, Yamamoto Metal Technos Co., Ltd., 4-7 Setoguchi, 2-chome, Hirano-ku, Osaka 547-0034, Japan

Abstract: A titanium silicium nitride coated thread mill was used for internal threading in this study. Helical-interpolation motion was implemented by simultaneously controlling three axes on a machining centre, and the machining phenomena were investigated and discussed. The workpiece material was carbon steel. Both pilot holes and internal threads were machined simultaneously using a thread mill (pilot-hole diameter d = 0 mm, without a pilot hole, or d = 8.5 mm, with a pilot hole). In the experiments, the feed rate of per tooth was kept constant, and the cutting speed was varied. The tool vibration and internal temperature were measured using a wireless tool-holder system, the cutting force along the X, Y, and Z dimensions was measured using a piezoelectric dynamometer, and the machining characteristics in the high-speed cutting range were discussed.

Keywords: thread mill; internal threading; helical interpolation motion; pilot hole; wet machining; wireless holder; tool vibration; chattering vibration; cutting force; tool internal temperature.

DOI: 10.1504/IJAT.2025.154587

International Journal of Abrasive Technology, 2025 Vol.13 No.1, pp.1 - 23

Received: 20 Jan 2025
Accepted: 16 Mar 2026
Published online: 06 Jul 2026 *

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