What Is a Dial Caliper Gauge?
A dial caliper gauge is a measuring instrument primarily used to measure inside and outside diameters and thicknesses. Its frame consists of various parts, making it a specialized instrument.
The contact part of the gauge extends from the dial, resembling the horns of a stag beetle in a “U” shape. This part is used for measuring dimensions by aligning the tip of the “U” with the appropriate measuring section on the object. Choosing a contact portion that matches the measuring section simplifies the measuring process.
Uses of Dial Caliper Gauges
First, select the suitable measuring element for the part to be measured from company catalogs. Next, set the dial caliper gauge on a model and adjust it to zero at the specified dimension. After removing the gauge from the model, touch it to the relevant measuring section of the workpiece to check the dimensional difference on the dial. The dimensions can be determined by the difference between the set dimension and the measured dimension.
Similar to dial indicators, calibration of the dial caliper gauge is essential and must be performed regularly using a specified method. Proper calibration ensures accurate dimensional readings on the dial.
Principles of Dial Caliper Gauges
Dial caliper gauges mainly consist of the dial gauge itself, a measuring element at the tip, and a frame (such as two U-shaped or L-shaped columns) connecting them. Their specialized shape allows for measuring parts that are inaccessible with standard dial indicators or digital calipers. Examples include measuring the outer diameter of a shaft in a complex interior, the concave radius of a cylindrical shape within an enclosed perimeter, or the thickness or height of a part where a height gauge cannot reach.
The frame has a fixed side and a movable side, allowing the tip of the installed dial gauge to move in tandem with the measuring element. This movement is then displayed as a dimensional difference on the dial gauge.
It is important to note that the direction of the frame’s movement may differ when the tip of the measuring element and the dial gauge touch the object. For high-precision measurements or when the contact between the measuring element and the workpiece is unstable, it is necessary to use an actual product model with known dimensions for zero setting, or to clarify measurement procedures and rules.