#Starrett depth gauge how to#

The following represent typical specifications but recognize that some specifications may vary depending on the specific type of depth gauge being considered.

When selecting a depth gauge, there are several key specifications and features to which consideration should be given before selecting a specific type or model. Vernier scales allow for precise measurements without the need to add additional graduation marks on the main scale which, at some point, renders the instrument unreadable.

#Starrett depth gauge how to#

To learn more about how to read a Vernier scale, please check-out this reference. The use of the Vernier scale permits the operator to obtain additional precision of depth readings using mechanical interpolation off the Vernier scale against the main scale. Vernier style depth gages use a Vernier scale concept like that which is used on a Vernier caliber. The resolution of depth rulers is generally lower than that of other types of depth gauges. Some models of depth ruler allow the user to rotate the orientation of the scale relative to the plane of the base surface, thus being able to be used to measure both the depth of the opening as well as its angular position. The thimble and sleeve on the depth gauge micrometer are identical to those found on a standard micrometer and reading the value of depth is performed in the same manner.ĭepth rulers, also called rule depth gauges, are a simpler form of depth gauge that features a graduated straight scale or ruler affixed to a locking bolt that can be raised and lowered into the recess to obtain a reading of depth. Because there is an electronic display used, a power source – typically a battery – is needed to power these instruments.ĭepth gauge micrometers provide a depth measure and have a rachet that can be turned to move the spindle face into the recessed opening until it contacts the bottom of the hole. The primary types include:Īnalog or dial-type depth gauges feature a mechanical dial and needle indicator to illustrate the depth measurement on the dial face.ĭigital depth gauges, also called electronic depth gauges, replace the dial and needle indicator that is used with dial depth gauges, substituting a digital display that directly indicates the measured depth directly with a given number of digits. Within the machining metrology space, there are several different types of depth gauges available. To learn about other measurement gauges, see our related guide on the types of gauges. The balance of this article will focus primarily on the former type of depth gauge only, namely the instrument used in machining metrology. That instrument is usually employed in situations where it is necessary to gauge the depth of holes drilled into bones for securing implants or other similar surgical uses. Another use of the term depth gauge is associated with medical applications and is termed a surgical or orthopedic depth gauge. Devices of this type are often referred to as diving depth gauges and are used by scuba divers to record the pressure associated with their dive levels. One alternative is the type of pressure monitor and display that can be used to indicate the pressure level associated with a given depth of immersion in water.

It should be noted that the term depth gauge may also refer to several alternative types of products. Generally, the proper usage is the former. Most references to the word gauge when referring to measurement instruments spell the noun with the letter u (gauge), but there are still cases where the spelling of the noun omits the letter u (gage), resulting in the term depth gage. The material’s surface represents the reference plane against which the depth measurement is made by the instrument. Image credit: Bildagentur Zoonar GmbH/Ī depth gauge typical refers to is a precision measurement instrument that is used by mechanical engineers, manufacturing engineers, and machinists among others, to accurately obtain the measurement of the depth of a bored cavity, recess, hole, groove or other similar openings that were created below the surface level of a material. Digital depth gauges offer convenience and precision