Dial bore gauge with dial gauge – SA070

The dial bore gauge with dial gauge is an instrument designed for checking internal diameters, ovality, taper and dimensional deviations on holes, bores and cylindrical seats. It is a highly versatile solution widely used in workshops, toolrooms and quality control departments whenever reliable and repeatable verification of internal measurements is required, especially on mechanical components where more accurate checks are needed compared to other measuring methods.

The operating principle of the dial bore gauge with dial gauge is based on comparative measurement. The instrument is first zeroed on a known reference value, then inserted into the bore to be checked and slightly oscillated until the reversal point of the dial gauge pointer is found. At that point, the deviation from the reference value is read. This system makes the dial bore gauge particularly effective when the objective is not only to know the diameter, but also to understand whether the bore is regular or shows ovality or taper.

One of the main advantages of the dial bore gauge is the possibility to check ovality. By measuring the same diameter in different orientations, the measured values can be compared to verify whether the bore maintains the same dimension at several points. Using the same principle, taper checks can also be carried out by comparing measurements taken at different depths within the same bore.

From a technical point of view, this instrument is suitable both for checking relatively small diameters and for much larger internal diameters. The available range covers measurement fields from 6-10 mm up to 250-450 mm, allowing use across a very wide range of applications. Measuring depth is also an important aspect: depending on the measuring range, it can vary from 50 mm up to 400 mm, a particularly useful feature when checks must be performed deep inside the bore and not only near the opening.

This combination of wide measuring ranges and extended measuring depth makes the dial bore gauge particularly interesting for companies working with components of different sizes. With the correct dial bore gauge configuration, it is possible to inspect many different bore dimensions while maintaining a single measuring logic between production and quality control.

From a practical standpoint, the dial bore gauge is especially useful for quick but reliable checks on internal machining operations, particularly when tight tolerances are involved. It helps the operator not only verify diameter conformity, but also better understand the actual behaviour of the internal machining process, highlighting possible variations between different sections of the same bore.

For setting, checking and calibration of dial bore gauges, a gauge block packers is particularly useful. It allows stable assembly of gauge blocks, creating reliable measurement references. This is especially advantageous when checking dial bore gauges on predefined fields or large diameters, because it allows correct instrument setting before use and reduces the need for numerous dedicated setting rings.

The dial bore gauge is a very useful solution for those looking for an instrument capable of combining versatility, accuracy and ease of checking on different internal diameters. It is suitable for precision mechanical production, cylindrical components, boring operations and dimensional inspections where it is important to quickly verify both size and bore geometry.

Applications

• Measurement of internal diameters on holes and bores
• Ovality checks on internal diameters
• Verification of bore taper at different depths
• Inspection of large bores
• Deep internal measurements
• Measurement of cylindrical bores
• Dimensional inspection in workshops
• Use in toolrooms and quality control departments

FAQ – Dial bore gauge with dial gauge

What is a dial bore gauge with dial gauge?
It is a comparative measuring instrument used to check internal diameters, ovality and taper on holes, bores and cylindrical seats.

What is a dial bore gauge used for?
It is used to verify internal measurements with greater detail than a simple diameter reading, highlighting possible bore geometry deviations.

How does an internal dial bore gauge work?
The instrument is zeroed on a known reference value, inserted into the bore and slightly oscillated until the dial gauge reversal point is found. At that point, the deviation from the reference value is read.

Can the dial bore gauge check ovality?
Yes, this is one of the main advantages of the instrument. By measuring the same diameter in different orientations, values can be compared and possible ovality verified.

Is it suitable for taper verification?
Yes, by performing measurements at different depths within the same bore it is possible to compare the readings and detect any variation along the bore axis.

What is the difference between a dial bore gauge and a dial gauge?
The dial bore gauge is the complete system used for comparative internal measurement, while the dial gauge is the indicating element displaying deviation from the measured reference value.

Which measuring ranges are available?
The available range covers fields 6-10 mm, 10-18 mm, 18-35 mm, 35-50 mm, 50-160 mm, 160-250 mm and 250-450 mm.

Can large diameters also be measured?
Yes, the dial bore gauge is also available for very large measuring ranges.

Can measurements be performed in depth?
Yes, depending on the measuring range, operating depth can reach up to 400 mm, making the instrument suitable for deep internal inspections.

Why is the dial bore gauge useful in workshops?
Because it provides fast, repeatable and technically reliable checks on internal diameters, helping the operator verify not only the dimension but also the machining quality.

How is a dial bore gauge correctly set and checked?
The dial bore gauge must be zeroed on a known reference value before measurement. For this operation, a gauge block setting fixture is extremely useful, as it creates stable references for checking and calibration.

Can the setting fixture replace setting rings?
In many applications yes, because it allows reference dimensions to be built using gauge blocks, reducing the need for numerous setting rings.

In which sectors is a dial bore gauge used?
It is widely used in mechanical workshops, production departments, metrology rooms and quality control, wherever accurate inspection of internal diameters and bore geometry is required.

What are the most common mistakes when using a dial bore gauge?
The most frequent errors are incorrect zero setting, dirty internal surfaces, unstable contact inside the bore and readings taken away from the correct reversal point.