A height gauge is a measuring device used either for determining the height of something, or for repetitious marking of items to be worked on. The former type of height gauge is often used in doctor's surgeries to find the height of people. These measuring tools are used in metalworking or metrology to either set or measure vertical distances; the pointer is sharpened to allow it to act as a scriber and assist in marking out work pieces. They may also be used to measure the height of an object by using the underside of the scriber as the datum. The datum may be permanently fixed or the height gauge may have provision to adjust the scale, this is done by sliding the scale vertically along the body of the height gauge by turning a fine feed screw at the top of the gauge; then with the scriber set to the same level as the base, the scale can be matched to it. This adjustment allows different scribers or probes to be used, as well as adjusting for any errors in a damaged or re-sharpened probe. Height gauges are primarily used in workshops and factories to measure the depth of a feature or to measure a distance with accuracy. According to "Quality Digest Magazine," all height gauges consist of a base, vertical shaft, a measuring unit that travels up and down along the shaft, and an arm protruding from the measuring unit that directly contacts the material being measured. A home-remodeling enthusiast could use a height gauge to accurately measure out, and subsequently mark, an exact cut location on a pipe or beam.
Vernier Height Gauges
· Lock the arm in place after positioning it on top of the piece being measured.
· Find the "zero" ("0") on the vernier scale that traveled with the arm along the length of the shaft.
· Record the number on the vertical shaft that falls opposite or just below the zero marking on the vernier scale. This is the first portion of your measurement.
· Determine by eye which numbered line on the vernier scale most closely aligns with a line on the vertical shaft. This numbered line is the final portion of your measurement.
· Combine the number opposite the zero line and the best-aligned vernier scale number to obtain the final height measurement of the object. If the zero line lands just past the 2.35-inch marking on the vertical shaft, and the best-aligned number on the vernier scale is "4," then the final measurement height is 2.354 inches.
Dial Height Gauge
· Lock the arm in place after positioning it on top of the piece being measured.
· Record the last visible number located under the measuring equipment on the vertical shaft. The numbers on the shaft are often in increments of 0.1 inches.
· Record the measurement marking that the needle is pointing to on the dial face. The dial indicator on a height gauge typically uses a 0-to-100 scale similar to the dial face on a caliper, with each line being a successive .001-inch representation and every .010-inch increment being numbered.
· Add the measurements from the vertical shaft and the dial together to obtain the total height measurement of the object. For example, if the shaft reads 1.2 inches, and the needle on the dial face is pointed to "53," the final height measurement is 1.253 inches.
Digital Height Gauges
· Lock the arm in place after positioning it on top of the piece being measured.
· Locate the digital display on the measurement unit.
· Read the number on the digital display. This is the height measurement of the object.
· Lock the arm in place after positioning it on top of the piece being measured.
· Find the "zero" ("0") on the vernier scale that traveled with the arm along the length of the shaft.
· Record the number on the vertical shaft that falls opposite or just below the zero marking on the vernier scale. This is the first portion of your measurement.
· Determine by eye which numbered line on the vernier scale most closely aligns with a line on the vertical shaft. This numbered line is the final portion of your measurement.
· Combine the number opposite the zero line and the best-aligned vernier scale number to obtain the final height measurement of the object. If the zero line lands just past the 2.35-inch marking on the vertical shaft, and the best-aligned number on the vernier scale is "4," then the final measurement height is 2.354 inches.
Dial Height Gauge
· Lock the arm in place after positioning it on top of the piece being measured.
· Record the last visible number located under the measuring equipment on the vertical shaft. The numbers on the shaft are often in increments of 0.1 inches.
· Record the measurement marking that the needle is pointing to on the dial face. The dial indicator on a height gauge typically uses a 0-to-100 scale similar to the dial face on a caliper, with each line being a successive .001-inch representation and every .010-inch increment being numbered.
· Add the measurements from the vertical shaft and the dial together to obtain the total height measurement of the object. For example, if the shaft reads 1.2 inches, and the needle on the dial face is pointed to "53," the final height measurement is 1.253 inches.
Digital Height Gauges
· Lock the arm in place after positioning it on top of the piece being measured.
· Locate the digital display on the measurement unit.
· Read the number on the digital display. This is the height measurement of the object.