Height gauges help measure an object’s or workpiece’s height. They can do this with many accuracies so you can be sure the measurement is correct. Height gauges can also help you mark objects’ locations relative to a reference plane, which can be helpful for future measures.
A height gauge is a device similar to a stadiometer used in medical facilities to measure a patient’s height. Although it is not as accurate or precise, it still serves its purpose. Height gauges are mainly used in quality control of manufacturing and production operations to establish features’ exact dimensions and locations.
This article will give you information about height gauges. You will learn about the different types of height gauges and what their specifications are. You can also learn about how they are used.
General Height Gauge Components and Set-up
Height gauges are tools that help you measure the height of things. The sliding carriage has a moving stylus or scribe mounted to a vertical axis beam or column. This beam is set up, so it is perpendicular to the base of the height gauge, which helps make it more stable for measurements.
The beam or column height varies from 6 inches to over 6 feet, depending on the type. Custom gauges may add additional length to the column. The carriage movement can be changed, and if needed, it can be locked in place with a set of adjustment screws that can make coarse or fine changes. A measuring jaw with parallel base surfaces is used instead of the measuring jaw. Instead of using the measuring jaw, a specialized scribing attachment may be utilized if desired.
When using a height gauge, you should use a granite surface plate to measure and scribe part features from a datum plane. A touch probe, scriber, or another measuring probe can be used to locate the appropriate quality or measurement point on the workpiece being inspected. Before taking measurements, it is essential to ensure that the gauge is seated correctly on the surface and that no contamination might interfere with accurate measurements.
Manufacturers of height gauges usually recommend that the bottom of the gauge be inspected before use. It is to remove any scratches, burrs, or other surface imperfections that may impact readings. Denatured alcohol is a mild cleaning agent to remove any material built up from using stones.
The height gauge and surface plate must be clean before using them. Using a test probe on the surface that will be used as the reference plane or point, the height gauge should be set to zero. Test the cover by pressing down on the part’s corners. Any variation in the indicator reading indicates that the surface level is inaccurate, and you must halt.
Types of Height Gauges
Height gauges are roughly classified into four types:
- Vernier height gauges
- Dial height gauges
- Digital counter height gauges
- Electronic height gauges
Vernier Height Gauges
Vernier height gauges are used to measure things more accurately. They come in sizes from 6 inches to 6 feet. They have imperial or metric measurements or both.
Dial Height Gauges
Dial height gauges are available in smaller sizes, typically less than 12 inches or 300 mm. They have a needle pointer that makes it easy to read the measurement. Because they are small, they are portable and can be stored in a toolbox.
Digital Counter Height Gauges
Digital counter height gauges are a type of height gauge with a dial and needle-like regular height gauges. Still, they also have a digital display that shows tenths of an inch. It makes it faster and easier to measure things accurately. They also can maintain an absolute or floating zero if needed.
Electronic Height Gauges
Electronic height gauges differ from other height gauges because they have digital displays instead of analog dials. It makes it easier to measure things in different units. Higher-end models also have extra features that make it easier to measure things accurately.
An air bearing or cushion technology allows the gauge to move light and smooth.
An automated measuring carriage facilitates measurement by eliminating the requirement for the operator to move the carriage.
Built-built temperature adjustment to account for differences in coefficients of thermal expansion across material types being measured
With RS323 or USB bus output, you can use it with SPC software programs to store and send data. The features help automate the measuring process, making it easier for the operator to take more measurements in less time.
Height Gauge Sizes and Specifications
- Height gauges are usually sized and specified by a few standard parameters. It includes the height gauge’s size and how it is defined. Remember that these specifications may vary depending on the brand and the height gauge you’re looking for. Knowing these specifications will make it easier to find or specify a model of the height gauge.
- Measuring range/size – The height gauge can provide measurements over a vertical range.
- Graduation – The number of lines that appear on the device’s measurement scale. It allows for more precise measurements.
- Accuracy – A gauge’s accuracy is how compact the size is to the actual value. Accuracy can be measured in terms of how close the measurement is to the gauge’s full-scale value or length units. The accuracy will depend on the measuring range and units; for example, a gauge with a higher measuring range will show more significant variations (+/- accuracy specification).
- The resolution reflects the least significant digit of the instrument’s measured value. For digital height gauges, this number of digits usually demonstrates the instrument’s resolution.
- Repeatability – The repeatability of a gauge is how consistent its readings are. It means that if you measure the same dimension multiple times, you will get the same reading every time. If a gauge has poor repeatability, each measurement will yield a different result.
- Measuring force – The force applied to the test workpiece by the gauge measuring probe or jaw.
- Maximum measurement speed – Motorized height gauges measure how quickly the carriage moves along the beam. It is typically measured in length/time units such as mm/s.
- Perpendicularity – A specification defines how far the height gauge beam is from the surface plate or base.
- Display Type An electronic height gauge is a tool used to measure the height of objects. It features several display options, including LCD, LED, and high-resolution color display.
- Depending on the model and gauge type, various measuring probes and carriers can be used to measure holes, slots, angles, and other part properties. These include disc probes, cylindrical probes, taper probes, depth probes, and spherical probes. There are also transducers for checking perpendicularity and measuring crooks.
Uses of Height Gauges
Gauges used to measure the thickness of materials and products are known as measuring gauges. They can perform a variety of tests, including:
- To calculate how far a specific feature on a part is from a reference surface to make sure it meets specifications and tolerances
- To make a part with accurate vertical dimensions or features from a datum plane so that it can be machined more accurately
- to quantify part characteristics in two dimensions
- To double-check center-to-center dimensions
- To determine flatness
- Angle measurement
- To determine the straightness/squareness/perpendicularity of portions
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Frequently Asked Questions About Height Gauges
What Are Height Gauges Used For?
Height gages measure and scribe part feature from a datum plane. A scriber, test indicator, touch probe, or CMM-style probe is usually used to locate the measured component. Height gages are an essential instrument for quality control.
What Is a Height Gauge Called?
Height gauges are devices that use a lower resolution to measure someone’s height. They are frequently utilized in healthcare settings such as clinics and surgeries. Height gauges can also calculate an object’s size using the scriber’s underside as the datum.
How Accurate Are Height Gauges?
Height gauges can be accurate to a thousandth of an inch (0.001″). Micrometers or electronic height gauges can be accurate to a tenth of an inch (0.0001″) or even better. The main weakness in accuracy for a height gauge is how square it is to the reference plane being measured.
What Is the Use of Vernier Height Gauge?
A height gauge, also known as a vernier height gauge, is used to measure the height of different types of objects. This precise and accurate measurement makes it an essential tool for quality control.
What Is Digital Height Gauge?
Height gauges are used to accurately measure the height of an object or piece of work. These precision measuring instruments also provide notable locations on an item relative to one reference plane for subsequent use.