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質問 Why is the repeatability the best in the world?
答え The conventional probe had been fixed with a press-fitting or epoxy adhesive the ball (5) of the internal mechanism .(Fig.1 formerly fixing system)
Epoxy adhesive (plastic) is unstable and change over time. Material that changes over time is not suitable for measuring instrument. Reproducibility is guaranteed ± 1 μm even if the length of the stylus is extended to 80 mm.
I noticed the frictional resistance (10) generated on the ball (5)
and the needle pin (3) in Figure 1.DLC coating was applied to reduce μ≈1 to μ≈0.05.
Repeatability is guaranteed ± 1 μm with 80 mm stylus. This is the best in the world.[Patent 5936199]
These two patent structures have become the best in the world [Patent No. 5133884] [Patent 5936199]

製品リンク Products that are relevant to this question is as follows. It will jump to the corresponding page by clicking.
[Point Finder Series]  [Centering Gauge Swing Type]