Precise Selection of Mitutoyo Dial Indicators

In the field of precision measurement, Mitutoyo dial indicators are renowned for their high accuracy and reliability, making them indispensable tools for measurement. However, with numerous models available, selecting the right one can be challenging. Understanding the various icons and symbols can greatly assist in your selection process.

Selecting Based on Measurement Accuracy

Dial indicators with a graduation of 0.01mm ("Dial Test Indicators" or "Percentimeters") are suitable for general dimensional inspection of mechanical parts. For micron-level high-precision requirements, those with a graduation of 0.001mm ("Dial Gauges" or "Thousandthmeters") are ideal.

(Dial face showing "→||←" with 0.01mm or 1μm indicating the graduation value)

Full range indication error 13μm

Indicators marked with this specific icon offer high accuracy exceeding the JIS standard by 15μm.

Dial Face Scale Types

Continuous Scale

The dial face of the continuous scale type allows for measurement over the entire range, making it easier to measure large variations.

Balanced Scale (or Symmetrical Scale)

The dial is evenly divided left and right with zero as the basis, making it more suitable for comparative measurement.

Double Spaced Scale Type

If you need to take readings for extended periods or under high intensity, the double spaced scale type indicator reduces eye strain and makes reading easier.

(Left: Double spaced scale, Right: Standard scale spacing)

Type with Coaxial Revolution Counter

For long stroke measurements, choose an indicator with a coaxial revolution counter. The long hand and short hand rotate simultaneously, helping you obtain measurement values quickly and accurately.

(Type with coaxial revolution counter)

(Image: Standard type for comparison)

Reverse Reading Type

The reverse reading type dial indicator is suitable for measuring hole depth or steps, offering convenience similar to using a depth gauge, making the process simple and efficient.

(Reverse reading type compared to continuous scale)

One Revolution Type

The one revolution type indicator features a unidirectional rotation design, limiting the pointer's revolution to within one turn, which helps prevent reading errors.

Selecting for Environmental Resistance

Based on your actual application environment, you can choose dial indicators with water and dust resistance features:

Waterproof & Dustproof Type (e.g., IP63, IP64)

These indicators have protective measures like seals and bellows on movable parts such as the spindle, preventing ingress of oil and water from various directions, protecting the internal precision mechanisms. Ideal for oily environments.

(IP64/IP63 type indicator)

Water Resistant & Oil Proof Type

These indicators are designed with water, dust, and oil resistance from the front and top, also suitable for dusty and oily operating environments.

( Water Resistant & Oil Proof type indicator)

Selecting for Durability

You can also choose more robust and durable types of dial indicators based on需求 (needs):

Shockproof Type

The shockproof type indicator has an internal shock absorption mechanism that protects against impact from rapid upward movement of the spindle, offering stronger impact resistance.

Upper/Lower Dead Point Cushion Type

The upper dead point cushion type has internal rubber components to cushion the impact when the spindle rises and stops. The lower dead point cushion type has a ring-shaped rubber washer on the upper part of the spindle to cushion the impact when the spindle descends and stops, extending service life.

(Upper dead point cushion type)

(Lower dead point cushion type)

Jewel Bearing Type

Jewel bearing type indicators use jewel bearings for enhanced durability.

Selecting Functional Types

Additionally, some functional types of dial indicators are available:

Low Measuring Force

When measuring easily deformable parts, using an indicator with high measuring force might deform the part. The low measuring force type applies a "gentle" force, preventing damage to the workpiece, making it the ideal choice.

Back Plunger Type

When aligning in confined spaces like machine tool tables, reading a conventional indicator is often inconvenient. Try the back plunger type indicator, where the spindle is perpendicular to the dial face, allowing for direct reading from above or the side.

( Back plunger type indicator)

Peak Hold Type / Pointer Adjustable Type

The pointer adjustable type indicator allows you to adjust the pointer position by turning the top knob while the spindle remains stationary, offering flexibility for different measurement and reading requirements. (Note: Original text mentioned two types but described one; Peak Hold typically holds the max value).

(Pointer adjustable type / Peak hold type mechanism)

Conclusion

By comprehensively considering factors such as the measurement object, environment, required accuracy, reading convenience, and mounting method, you can select the most suitable Mitutoyo dial indicator for your application.