TOOL POSITION MEASUREMENT DEVICE, TOOL POSITION MEASUREMENT METHOD, GROOVE PROCESSING DEVICE AND GROOVE PROCESSING METHOD

To improve accuracy in measuring a position concerning a rotary tool.SOLUTION: A tool position measurement device 100 comprises: a conductive gauge head 101 including a contacting sphere part 101a that is contacted with a work-piece, which can be mounted so that the contacting sphere part 101a rotates coaxially with respect to a haft part 10b in a rotary tool 10 to be gauged, at a position at a tip side of a cutting part 10a in the rotary tool 10 to be gauged; a contact detecting part 111 that detects whether the contacting sphere part 101a in the gauge head 101 is in contact with the work-piece; and a contact time-ratio calculating part 112 that calculates a ratio of contact time during which the contact detecting part 111 is in contact with the work-piece to total time of the contact time and non-contact time during which the contact detecting part is not contact with the work-piece, on the basis of a detected result by the contact detecting part 111 in a period of time during which the rotary tool 10 rotates.SELECTED DRAWING: Figure 6 【課題】回転工具に関する位置の測定精度を向上させる。【解決手段】工具位置測定装置１００は、被加工物に接触させる接触球部１０１ａを含み、測定対象の回転工具１０における刃部１０ａの先端側の位置で当該接触球部１０１ａが測定対象の回転工具１０における柄部１０ｂに対して同軸で回転するように取付け可能である導電性の測定子１０１と、測定子１０１における接触球部１０１ａが被加工物に接触したか否かを検出する接触検出部１１１と、回転工具１０が回転している間における接触検出部１１１の検出結果に基づいて、接触検出部１１１が被加工物に接触した接触時間と、接触部が被加工物に接触しなかった非接触時間との合計時間に対する当該接触時間の比を演算する接触時間比演算部１１２とを備える。【選択図】図６