How does the base of a micrometer depth gauge differ from that of a standard micrometer?
It is flat and wide for stability on surfaces
A standard micrometer has a C-shaped frame with an anvil and spindle that grip a workpiece between them.
A micrometer depth gauge instead has a flat, wide base (the reference face) that rests across the top of a hole or slot, while the measuring rod extends down to the bottom.
Hence, its flat, wide base gives a stable seating on the surface so the depth is measured squarely.
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