A cylinder is a circular container with a fixed diameter and height. It's a common container for storing air and other gases under pressure due to the internal strength of this shape. The bore of a cylinder is the diameter of its interior and allows you to determine the cylinder's volume when you also know its height. A dial bore gauge is a specialised instrument for measuring a cylinder's bore.
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- Dial bore gauge
Obtain a dial bore gauge. This device has a long stalk with a dial indicator at one end and a tripod at the other end. One leg of the tripod is an interchangeable post, and the other two legs of the tripod are hardened buttons. A gauge plunger lies between these two buttons.
Zero the gauge by measuring a reference cylinder. This cylinder has the correct bore of the test cylinder you will measure later. Rotate the face of the dial until the needle aligns with the zero on the dial.
Insert the dial bore gauge into the test cylinder to the desired depth. Rock the gauge back and forth until you get the minimum reading. This occurs when the gauge is at a right angle to the bore and the needle reverses direction.
Read the dial measurement as indicated by the needle. This measurement will indicate the deviation from the reference measurement that you made in step 2, rather than an absolute measurement of the cylinder's bore. A negative reading means the cylinder's bore is smaller than the reference measurement. A positive reading means the cylinder's bore is larger than the reference measurement.
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