@article{oai:jaxa.repo.nii.ac.jp:00034201,
 author = {安川, 太郎 and 關, 悟 and Yasukawa, Taro and Seki, Satoru},
 issue = {11/12},
 journal = {東京大學理工學研究所報告},
 month = {Oct},
 note = {Drilling spindles with precise ball bearings and special adjustable chucks were made for the purpose of using in bench boring machine. The spindles could be driven very silently at high speed without vibration, and have already been used in practice for over two years. With these spindles, the efficiency of drilling small holes in pillar-plates has increased by 200 %. Experimental investigations on the relations between drilling efficiency and rotating or feeding speed were carried out in the laboratory, and it is concluded that in order to drill. Small precise holes (0.3mm-1.5mm) efficiently, drills must be chucked with eccentricity less than about 0.005mm, and must be driven with high speed over 10,000rpm., 資料番号: SA1511444000},
 pages = {335--341},
 title = {小孔の加工能率の向上について : 精密ボール盤主軸の試作(應用力學)},
 volume = {3},
 year = {1950}
}