Why is an outside micrometer not suitable for measuring deep internal grooves?
The spindle cannot reach into grooves
An outside micrometer measures across an object between a fixed anvil and a moving spindle on a C-frame.
Both the anvil and spindle face each other on the outside of the frame, made to grip a surface from outside.
A deep internal groove is sunk inside the workpiece, and the micrometer's spindle and anvil cannot enter that narrow recess.
Because the measuring faces cannot reach into the groove, an inside micrometer or bore gauge is used instead.
Hence, the answer is the spindle cannot reach into grooves.
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