A depth gauge measures the depth of a bore, hole, or cut and can be a precision tool or as simple as a piece of tape. It is critical in manufacturing processes, such as setting the depth of a pinion against a ring gear in an automobile drive axle. Digital measuring devices are becoming more common in production lines. Incorrect readings can result in damaged products.
A depth gauge is an instrument used to measure the depth of a bore, hole or cut. Often referred to as a depth micrometer, the depth gauge can be a precision measuring tool that can provide depth reading in a variety of measurements. It can also be as simple as a piece of tape wrapped around a drill bit or similar drilling tool to indicate when the correct depth has been reached. Sometimes, a depth gauge is nothing more than a tool that is inserted into a hole. It has an indicator marked red for “no go” and one green for “go”, which is pushed up and out of the tool handle when the probe hits the bottom of the hole, indicating a hole properly practiced.
When working on a very critical project, the use of a micrometer style depth gauge will provide an exact measurement of the depth of a hole or cut to ensure correct machining has been completed. This precise measurement, however, is often lost in a production line type machining operation and is the typical go/no go depth gauge commonly used to check a machinist’s work. Many machine shops and manufacturing plants are starting to use digital measuring devices to make it easier for workers, who lack the ability to quickly read fine measurements on a micrometer, to check the depth of a drilling, reaming or cutting stage in a production cycle.
Understanding the critical aspect of setting a component to the correct depth is critical in some manufacturing facilities. Setting the depth of a pinion against a ring gear in an automobile drive axle, for example, is a very critical step in the longevity of the vehicle’s drive axle. Close enough is not good enough in this type of gear setup, and the depth gauge needs to be accurately checked three or four places after the decimal point in this type of application. Anything less than perfection will result in a damaged and failing drive gear within a very short distance.
The depth gauge is a fundamental tool used in many manufacturing processes, from automotive engines to surgical instruments and ceramics. Failure to read the depth gauge correctly when creating the recess for a ceramic pot and lid will result in a loose lid or worse, a lid that doesn’t fit at all. When used in gunsmith operations, the correct depth gauge reading is dependent on allowing the round to sit deep enough in the firing chamber to prevent breech explosions.
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