Depth gauge is a precision measuring instrument designed to determine the depth of holes, slots, and recesses
with high accuracy. Today, we will provide a detailed breakdown of the depth gauge's structural nomenclature,
key component functions, and operational procedures.
Ⅰ. Main Components of a Depth Gauge
1. Beam: The beam serves as the main body of the depth gauge, typically made of stainless steel
or other wear-resistant materials. It features engraved graduations for measurement reading, functioning similarly
to a standard ruler where the scale markings are essential for taking measurements.
2. Frame: The frame is the component that secures and supports the beam, usually constructed from metal materials.
Acting as the "skeleton" of the depth gauge, it ensures the stability of the beam and measurement accuracy.
3. Measuring Probe: The measuring rod is the component that detects the depth of the measured object,
typically made of hard alloy or other wear-resistant materials. It functions as the "antenna" of the depth gauge,
capable of extending into holes or grooves for measurement.
4. Locking Screw: The locking screw is used to secure the position of the measuring rod. Once the desired depth
is found, tightening the locking screw fixes the rod in place for easy reading of measurements - similar to how we lock
the reading position when using calipers.
II. Detailed Explanation of Depth Gauge Structural Components
1.Reference Surface: The reference surface is the flat plane on the frame that contacts the measured object,
serving as the starting point for measurements. Similar to aligning the zero mark of a ruler with the edge
of an object when measuring length, proper contact with this surface ensures measurement accuracy.
2. Graduation Marks: Graduation marks are the measurement indicators engraved on the beam, typically marked
in millimeters (mm) or inches (in). These markings enable precise reading of depth values.
3. Probe Tip: The probe tip is the contact point of the measuring rod that touches the measured object.
Its shape and dimensions directly impact measurement precision—common tip types include flat, pointed,
or ball-shaped for different applications.
III. Depth Gauge Operation Guide
1.Positioning the Frame: Firmly press the depth gauge's reference surface against the target object's surface
to establish the measurement baseline.
2. Extending the Measuring Rod: Gently lower the measuring rod into the hole or groove until the probe tip
makes full contact with the bottom surface.
3. Locking the Rod: Engage the locking screw to secure the measuring rod in position, preventing accidental
movement during reading.
4. Reading Measurement Values: Record the measurement where the beam's graduation marks align.
IV. Depth Gauge Usage Precautions
1.Maintain Cleanliness: Before and after use, thoroughly clean all components of the depth gauge, particularly
the measuring rod and reference surface, to prevent contamination from affecting measurement accuracy.
This follows the same principle as cleaning any precision instrument prior to use.
2. Handle with Care: Avoid impact between the depth gauge and hard objects to prevent damage to the beam
or measuring rod. Always exercise caution when handling to maintain instrument integrity.
3. Proper Storage: Store the depth gauge in a dry, well-ventilated environment to prevent moisture accumulation
and corrosion. A protective case is recommended for long-term storage.
