What Is a Scissors Gauge?
Scissors gauges are a type of limit gauges, which are tools used to measure whether the outside diameter of a rod-like object (shaft) is within a predetermined dimension by placing it between the rod and the shaft. They are also called a snap gauge because they are made of a steel plate.
They are tools that have two measuring faces, one on the street side and the other on the stop side, and are used to measure an object by placing it between them.
The standard type has a measuring range of 0 to 1000 mm and a minimum display of 0.01 mm.
There are two types of shapes, single or double-ended, with the single-ended shape being widely used due to its ease of use.
Uses of Scissors Gauges
Scissors gauges are used in various industries, including the automotive industry, electronics, semiconductors, control equipment, and construction.
In particular, they are used to inspect products that require micron-level accuracy, products that require time-consuming inspections due to the existence of multiple measurement items for a single product, and a small number of products.
Examples are as follows:
- Inspection of engine parts such as measurement of piston shape and outer diameter.
- Maintenance of automobile internal combustion engines.
- Parts production for motorcycle modification.
- Checking the thickness of thin sheets.
- Inspection of motor shafts.
- Maintenance of precision machinery and process control systems.
- Measurements and inspection of machine parts.
- Repair of agricultural machinery.
- Measurement of parts with specified tolerance in shaft machining and lathe machining.
- Thickness measurement of metal plates and blades.
Features of Scissors Gauges
Scissor gauges have a simple structure, with the maximum value of the tolerance of the shaft diameter set at the gauge passage and the minimum value set at the gauge stop. If the shaft diameter does not pass through the passage, the shaft diameter is too large, and if it passes through the stop, the shaft diameter is too small.
Martensitic stainless steels, which have high strength, hardness, and wear resistance through heat treatment, and die steels, which can be hardened to high hardness, are also often used.