Using a manual height gage is simple.Once you have the height gage set in place, there are two critical references that need to be established. When to use a manual or automated height Gage? The primary weakness in accuracy for a height gauge is how square it is to the reference plane being measured. A micrometer or electronic height gauge is accurate to a tenth (0.0001″) or sometimes even better. A typical height gauge is good to a thousandth (0.001″). Look at the height gage to make sure it is beefed up for the job, and check to make sure it has a precision surface to rest on. As a concerned parent to your height gage, it’s up to you to deal with its issues and choose who will be working with it. If the base is 6 inches long, a 50-microinch error would grow to more than 0.0003 inch in 36 inches. altitude is used in measuring the distance above a fixed level. Height may be used in measuring something from bottom to top. Outside dimensions are measured by the outside caliper and inside dimensions are measured by the inside caliper. What is the accuracy of a Vernier height gauge?Įxplanation: A Vernier depth gauge or Vernier height gauge is a precision instrument used to measure the depth of holes, recesses, slots, and steps within an accuracy of 0.02 mm. What is height gauge used for?Ī height gauge is a measuring device used for determining the height of objects, and for marking of items to be worked on. Standard height gauge with vernier graduation and digital height gauge. Record the number on the vertical shaft that falls opposite or just below the zero marking on the vernier scale.Find the “zero” (“0”) on the vernier scale that traveled with the arm along the length of the shaft.Lock the arm in place after positioning it on top of the piece being measured.With measurement contact in its lowest obtainable position, adjust gage to indicate zero. Select two additional checkpoints in the upper half of the measurement range. Randomly select six checkpoints in the lower half of the measurement range. How do you calibrate a height gauge?ĭivide the total measurement range of IUT into two equal parts. If the reading is 0.08 mm, the zero error is referred to as −0.08 mm. Negative zero error refers to the case when the jaws of the vernier caliper are just closed and the reading is a negative reading away from the actual reading of 0.00 mm. If the reading is 0.10 mm, the zero error is referred to as +0.10 mm. To scribe a part with accurate vertical dimensions or features from a datum plane so that additional machining can be done.To measure the distance from a reference surface to a specific feature of a part to verify that it meets specifications and tolerances.upper and lower are parallel to the base. Which of the following is incorrect for vernier height gauge? Explanation: Both surfaces of measuring jaw i.e. Which of the following is incorrect for Vernier height gauge?ġ. Generally a scriber, test indicator, touch probe or CMM-style probe is used to locate the measured feature. Height gages are normally used on a granite surface plate to measure and/or scribe part features from a datum plane. They claim consistency of ☐.0001 inch and can be extremely precise up to 0.001 inch.Ī height gage does exactly as its name indicates-measures the height of a workpiece. How accurate does a height gauge measure?Ĭenter-line distances, internal/external diameters, and step heights are some of the different measuring tasks that can be carried out by high-specification digital height gauges. Potential causes of error Like the caliper, the error factors involved include parallax effects, error caused by excessive measuring force due to the fact that a height gage does not conform to Abbe’s Principle, and differential thermal expansion due to a temperature difference between the height gage and workpiece. What are two possible sources of error when using a Vernier height gauge?ġ. 11 How does a circular scale height Gage work?.10 What is the accuracy of a height gauge?. ![]()
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