What is a Co-Ax Indicator? - Higher Precision Blog
https://www.higherprecision.com/blog/what-is-a-co-ax-indicator
WEBJul 8, 2019 · A coaxial indicator is one variety of indicator used to measure the center of bores, shafts, arbors, holes, and more. When clamped into a tool holder, like a mill, the coaxial indicator is positioned at the center of the axes across the hole and the tip of a probe is adjusted to touch the surface around with the tool is being centered.
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