Various Methods used For Dial Bore Gauge

Level of complexity in setting a dial bore gauge all depends upon the method you have chosen to use. Today, we are going to take you through the general methods by which you can set a dial bore gauge, and the associated advantages and disadvantages of each method. We believe possessing the knowledge of how to accurately set a dial bore gauge is an important skill for any machinist or metrologist.

In general, the process of setting a dial bore gauge is important to maintain an accurate reference point of zero. The reference point of contact on the dial bore gauge is taken into consideration to set the nominal size, and when the bore gauge is been properly set, it will show a reading of zero when measuring the particular nominal size. In other words, you need a zero point from which you measure beyond. Setting the zero point, or the nominal size can be accomplished through a number of methods.

METHOD: 1

A common method to set a dial bore gauge involves using an external micrometer. The steps to accomplish this are:

1. Calibrate your micrometer to the size of the bore you are testing.
2. With the help of the extensions needed for the specific bore diameter, set up your dial bore gauge using the proper extensions.
3. Set your gauge in between the micrometer spindle & anvil.
4. Through a rocking motion, adjust the gauge into the micrometer.
5. Zero the indicator to the minimum reading and that is your nominal size.

This method is no doubt the fastest and most convenient method, given if you have all the available of the tools involved. However, when we use a micrometer to set your dial bore gauge, you are bound to risk all including the measurement errors of the micrometer itself, and of misaligning the spherical measuring points of the gauge to the micrometer.

METHOD: 2

Another way to set a dial bore gauge is to utilize a master ring. In order to set your dial bore gauge in this way:

1. Lay your master ring on a smooth, hard surface, like a granite surface plate.
2. Set your bore gauge in the ring, thus supporting it.
3. Adjust the sensitive contact point of your bore gauge until the indicator reads zero.

The key benefits of this method are that the actual measurement goal is duplicated and master rings can be easily made available to very closely match the size of a part. The major disadvantage for using these master rings for setting your dial bore gauge is that they are very expensive tools, and procuring one for every potential bore sizes you require could become quite costly.

METHOD: 3

A third method of setting a dial bore gauge involves the use of a gauge block assembly.

1. By setting gauge blocks into a clamp with jaws at both ends, you are able to create a highly accurate reference master by which to set your gauge.
2. Gauge blocks are readily available, and most workshops or warehouses will already have them on hand.
3. Additionally, gauge blocks provide multiple sizes which can result in more flexibility of measurement and savings in cost.
4. The central disadvantage of using gauge blocks in order to set your dial bore gauge is the time that it takes to assemble the gauge blocks to match the required nominal size or zero point.
5. Furthermore, you run the risk of having potential errors resulting from the wringing process that may be tricky to pick up on.

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