Types of Digital Micrometers

Let's look more into the various types of Digital Micrometers. As I mentioned before there are basically Digital Micrometers measured for external dimensions and internal dimensions. Digital Micrometers is Micrometers with a Digital scale to enhance the ability of a Micrometer to measure precise dimensions. In today's market Micrometers with dial and digital read out are commonly available. Based on this let's list out the various types of Digital Micrometers available.

Outside micrometers

Outside micrometers are used for measuring outer dimensions, like the thickness of sheet stock or outside diameters of round stock. The screw thread micrometer is a type of outside micrometer used to measure not only the diameter of screws, but also the pitch of their threads. The object to be measured is placed between the stationary end of the micrometer, called the anvil, and the moving end, called the spindle. A knob, called a ratchet, is turned, pushing the spindle against the object. The thickness may be indicated by a mark on a vernier scale or by digital display.

Inside micrometers

Inside micrometers are used for measuring the inside dimensions of an object: the inner diameter of a tube, bushing, cylinder, etc. They consist of a micrometer head, a set of extension rods, and in some cases a handle. The length of the head itself is what is measured, since it is placed within the diameter being measured; the smallest heads available are one-quarter-inch. The extension rods are used when the maximum length of the head is too small for the opening. The handle is used for inaccessible places, and the diameter is read from a vernier scale or a digital display.

Depth micrometers

Depth micrometers are used for measuring the depths of blind voids, grooves, recesses, etc. A flat surface at the top of the hole is required for the micrometer base to sit on, and the micrometer should be held firmly in place for an accurate reading. The ratchet is turned until the spindle touches the bottom of the hole, and the depth is read from the vernier scale or digital display.

Bore and Tube Micrometers

Bore is essentially the inner diameter and shape of a cylinder. Bore micrometers, also called bore gauges, are similar in use to inside micrometers, but function in a different way. They read a value relative to the known vale of a "master" bore, such as a preset micrometer, and their precision also allows measurements of ovality or deviations in shape.

Tube Micrometers are essentially outside micrometers that have been modified for measuring the thickness of the walls of tubes and other cylindrical objects.