Poker gauge is one unique tool among different types of measuring instruments is available in mechanical or digital form on ships. Related Read: Measuring Bearing Clearance of Engine with Feeler & Swedish Gauge Poker Gauge
It is essential that after the use of the telescope gauge, the strip should be cleaned and retracted back to its housing, else it may damage the feeler strip. It is used to measure the bearing clearance of the top shell.
The long feeler strips protrude out of the cover like a telescope so that it can be inserted into remote places where feeler gauge access is not possible. Similar to the functionality of feeler gauge, this type of gauge is also known as tongue gauge, and it consists of long feeler gauge inside a cover with tongue or curved edge. The feeler gauge is widely used to measure piston ring clearance, engine bearing cleaner, tappet clearance etc. The feeler gauge is used to measure the clearance or gap width between surface and bearings.Į.g. The thickness of each strip is marked on the surface of the strip. Feeler gaugeįeelers gauges are a bunch of fine thickened steel strips of different thickness bundled together. The Least count of the micrometre is 0.01 mm or 0.001cm. They are available in two types- Inside micrometre (to measure inside diameter) and Outside micrometre (for measuring outside diameter). Large micrometre is used as a special mechanical measuring tool for main engine to record the outer diameter of the piston rod. The large micrometre calliper is used to measure large outside diameter or distance. The micrometre size can vary from small to large.
It is an excellent precision tool which is used to measure small parameters and is much more accurate than the vernier calliper. Least Count= Value of one main scale division – Value of one vernier scale division. Least count of the vernier calliper is the difference between the values of main scale division and one vernier scale division. Vernier calliper is one of the most used mechanical measuring tools onboard ship. It can be a scale, dial or digital type Vernier calliper. It has got two different jaws to measure outside and inside dimensions of an object. It is counted in the list of quality measuring instruments, which are used to measure small parameters with high accuracy. Other types are odd leg and divider calliper. Some callipers are integrated with a measuring scale hence there is no need of other measuring instruments to check the measured length. After measuring the body/ part, the opening of the calliper mouth is kept against the ruler to measure the length or diameter. This tool is used on those surface where a straight ruler scale cannot be used. It requires an external scale to compare the measured value. They are used to measure internal and external size (e.g. They are usually of two types- inside and outside calliper. Related Read: How Are Nautical Charts Corrected On Ships (Using Scale &Ruler)? Calipers It is made from stainless steel which is durable and will not rust or corrode. The ruler and scales are not used where precise measurement is required. They are used for quick measurement of parts and always kept with other measuring gauge or tools in the workshop for handy access. They are usually available in the measuring scale of inch or cm. They can be a single steel plate or a flexible tape type tool. This tool is one of the most famous measuring instruments in mechanical engineering. They are used to measure lengths and other geometrical parameters. There are many instruments, tools and gauges which are used on a daily basis onboard ship for measurement, fault finding, wear down etc.įollowing are the essential tools, gauges and mechanical instruments and their uses: Photo by arnphoto/depositphotos Popular mechanical gauges and tools used on ships are: Ruler and scales Popular mechanical gauges and tools used on ships: These are critical engineering parameters, which describe the condition of the working machinery.īelow, we have compiled a list of mechanical measuring instruments and mechanical gauges which are extensively used on the ship for the recording of different parameters. Measuring instruments and gauges are used to measure various parameters such as clearance, diameter, depth, ovality, trueness, etc. For different types of machinery and systems, various measuring tools, instruments and gauges are used on a ship. Machinery onboard ships require regular care and maintenance so that their working life and efficiency can be increased, and the cost of operation, which includes unnecessary breakdowns and spares, can be reduced.
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