What is Johansson Mikrokator?

Introduction

A comparator is not only a measuring device but it is also used as a comparison device. This is because it can help compare the measured value of a substance with the actual value. Numerous comparators, such as the Johansson Mikrokator, are available on the market. A Johansson Mikrokator, also known as Abramson’s movement, is a mechanical comparator utilized to get a mechanical magnification of the difference in length relative to a standard. This instrument particularly values high accuracy in industries and laboratories, such as aerospace, automotive, and mechanical engineering, where high accuracy is imperative. The Johansson Mikrokator achieves sensitivity and reliability through relatively simple mechanical principles. In contrast to electronic comparators, it is a very reliable tool in the presence of stability and precision.

Scope

The Johansson Mikrokator plays a pivotal role in applications requiring micrometer-level accuracy. Its primary purpose is to compare the dimensions of a test piece against a standard or reference measurement. The following are some common areas where it is extensively used:

• Manufacturing Quality Control: Ensuring components meet exact specifications in aerospace, automotive, and tool manufacturing industries.
• Research Laboratories: Performing precision measurements for scientific experiments and prototype development.
• Gauge Calibration: Verifying the accuracy of gauges, micrometers, and other measuring instruments.
• Material Testing: Analyzing dimensional changes in materials under varying conditions such as temperature or stress.

Procedure

The Johansson Mikrokator employs a simple yet ingenious mechanical principle involving a strip of metal, a lever, and a pointer. The following is an overview of its operational procedure:

• It operates based on a button rotating on a string loop.
• A force given to the plunger’s tip or bottom causes it to travel upward.
• The bell crank lever is attached to the upper part of the plunger.
• One of the bell crank lever’s arms experiences an upward force from the plunger. The upward force of the plunger causes another arm to shift because two arms are joined at a 90-degree angle.
• The twisted strip becomes even more twisted or untwisted as a result.
• The Length of the strip changes depending on whether it is twisted or not.
• As a result, as the plunger moves, the light pointer turns slightly, displaying the deflection on the linear.

Sample size

The following are the technical specifications of Johansson Mikrokator:

Result

A mechanical comparator called the Johansson Mikrokator determines how much two pieces differ in Length. This gadget uses a button that spins on a thread loop to magnify the length difference. The following equation provides the ratio that represents the magnification of the Johansson MikroKator:

where,

• l = Length of the metal strip
• n = Number of turns on the metal strip
• w = Width of the metal strip.

The magnification of this instrument depends upon the length of the strip and the number of twists in the twisted strip.

Conclusion

The Johansson Mikrokator is an accurate, reliable instrument for measuring even minute differences in Length between any two pieces. The mechanical magnification system helps to catch and show the deviation and offers the advantage of a power-independent electronic-free solution for dimensional comparison; simplicity, durability, and outstanding accuracy make it indispensable in a quality control and precision engineering system that guarantees the component meets exact tolerance and standards. Even with electronic and digital comparators, the Johansson Mikrokator is highly useful, especially in power-independent operating conditions. It is, therefore, very popular among professionals who want high accuracy in dimensional metrology.

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