The right measuring tool is inevitably related to the needs of your shop. ![]() As always, however, there’s no clear answer to this question. Starrett 781XTZ-258 3-Point Contact 2-2 5/8-Inch Rangeĭial bore gauges are a good compromise as they work great with any type of hole, they are not too expensive and are fairly easy to use. ![]() What’s the catch? Out of all the tools we recommend above, they are the most expensive. They are self-centering, self-aligning and can be extended for deep holes. Doesn’t require a second measuring toolįowler Full Warranty Extender Dial Bore Gage Set, 52-646-400, 1.4-6″ Measuring Range, 0.0005″īy far the easiest and most accurate tool to measure internal diameters.Easy to set up, very little skill required.They are easy to set up, as the read-out will tell you when the tool is perpendicular to the hole axis and they are great for measuring the taper of deep bores. A dial bore gauge is easier to position than any other tool mentioned above and is very accurate. It’s a sensible option if you are going to be measuring bores frequently as the read-out is given on the dial, with no secondary measuring. 001″ Tublar Inside Micrometerĭial bore gauges are the most used tool for measuring inside diameters and for a good reason. Practice is needed to obtain an accurate measurement as it’s not easy to make sure that the tool is perpendicular to the hole axis.When this happens, you use the numbering system on the thimble to find your measurement. This then extends until each end of the tool is touching the inside of the bore. As the thimble turns, the micrometer expands like a curtain rod. Rod-type micrometers, characterized by their “pen-like” shape, are more suitable for larger diameters as they are extendible. Jawed micrometers, similar in shape to calipers, are mostly used to measure small holes. They are available in two different types: rod-type (or tubular) and jawed. Inside micrometers are accurate, direct measuring tools. Requires “skilled” hands to position it correctly in the hole.Not as accurate as other ID measuring tools.Modern digital models, however, are now equipped with a display to read the measurement.Īlthough they are a valuable tool, inside calipers are not used as much nowadays as they were in the past. Just like telescoping gages, old school inside calipers don’t measure the diameter directly and they need to be used in combination with a measuring tool such as a ruler or micrometer. The friction of the screw and adjusting nut counteracts the tension of the spring which determines the position of the legs. Inside calipers, also called spring-joint calipers, consist of two legs, a spring, and an adjusting nut. Starrett S579GZ Self Centering Telescoping Gauge With 2 Telescoping Arms Requires a second measuring tool to take the measurement.Fairly inexpensive when compared to other ID measuring tools.No practice needed to fit it into the hole. ![]() The size of the head is then measured using a device such as a micrometer. After choosing the appropriate size, the head of the gage is inserted in the hole and locked with the locking screw at located at the bottom of the tool. Measuring an inside diameter with this type of tool is fairly simple. They are typically T-shaped, with a head featuring telescopic rods that can retract and extend to fit the hole. Telescoping gages measure the size of the bores by transferring the internal dimension to a remote measuring tool, in most cases a micrometer. Let’s take a look at the different types of tools to identify which ones are the most accurate and efficient. This is mostly due to the fact that some tools are easier to position than others and therefore require more skills and practice. These tools, commonly known as bore gauges (or gages), come in a wide variety of types and sizes and are used to measure the inside diameter of a hole or cylinder.Īlthough they are all designed to deliver very precise measurements, some of them are more accurate than others, especially when it comes to repeated measurements. Since you need a specific set of tools to perform boring operations, hole measurement also requires specific tooling. Jokes aside, boring is a frequent operation in machine shops as holemaking applications are pretty common, especially in the automotive or gunsmithing sectors. Machining is the only field where boring can actually be considered entertaining.
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