Run out measurement of the watch parts fixing axis in the cylindrical grinder machine : multi step method application for rotating axis performance with a newly developed elastic deformation instrument for two core axes coincidence

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Other Title
  • 円筒研削盤時計部品取り付け軸の回転運動精度測定 : 四軸弾性変形機構によるセンタリング装置とマルチステップ法の適用
  • エントウ ケンサクバン ドケイ ブヒン トリツケ ジク ノ カイテン ウンドウ セイド ソクテイ 4ジク ダンセイ ヘンケイ キコウ ニ ヨル センタリング ソウチ ト マルチステップホウ ノ テキヨウ

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Description

When we try to measure the run out accuracy of a tool machine spindle, we generally use both a sophisticated polished sphere as a roundness master and a condenser type probe, then we make the machine spindle rotate and we measure the master sphere surface run out attached to the spindle. This data contain not only spindle run out error but also sphere profile error. We apply multi step point method for the purpose of separation of run out error and sphere profile error. Co-axiallity; Run out center of the spindle and the center of a master sphere should be coincident almost perfectly, otherwise complete and accurate separation by the multi step method will not be applicable. We applied a newly developed two dimensional adjusting instrument on which the upper mentioned master sphere is located. This instrument consists of 4 smaller diameter columns and 1 bigger one. Bigger cylinder is elastically bent first by 4 bolts screws, then four columns deforms, too. Two reductions of bolts displacement has been done by these columns. Now it is possible to adjust the sphere center within a few or less than 1μm. We make sure the spindle run out is 1.3〜1.2μm and the sphere profile is 3.8〜3.9μm respectively within 0.1μm repeatability.

Journal

  • Micromechatronics

    Micromechatronics 50 (194), 26-33, 2006

    The Horological Institute of Japan

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