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Plant manufacturing instruments for measuring dimensions in mechanical engineering

Plant manufacturing instruments for measuring dimensions in mechanical engineering

This involves quality assurance, quality control and metrology. We use quality assurance to gain confidence that quality requirements will be fulfilled. Quality control is used to check that requirements have been fulfilled. This is a subtle difference and in practice the terms are sometimes used interchangeably. Metrology is the science of measurement. It is how we ensure that we can confidently compare the results of measurements made all over the world.

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Content:

Tech 101 – How to use measuring tools

VIDEO ON THE TOPIC: Measuring Instruments, Least Count, Parts name and Details

With a need to make quality products which meet design specified tolerances, a large number of firms, research and development centers, and school and college laboratories use measuring instruments that have high accuracy and precision. The special branch of science that deals with such instruments is known as metrology.

Here we will look at the features and use of certain well known precision measuring instruments used for linear measurement. Vernier Caliper: It is an instrument used to measure internal and external dimensions of an object with a great accuracy.

It is provided with inward jaws and outward jaws to facilitate the measurement. A screw clamp is provided that can lock the position of the vernier scale, so that the instrument can be moved without disturbing the reading. A manually operated vernier caliper has a main scale in millimeters or inches and a sliding vernier scale attached to the movable jaw, as shown in the figure.

The term "least count" is used to define the accuracy of a vernier caliper. It is the ratio of the smallest division on the main scale to the total number of divisions on vernier scale.

So when we measure a dimension of an object using a vernier caliper, the formula for final dimension is,. Disadvantage: It is very delicate to choose the vernier scale reading, which is the line on the vernier scale, exactly coinciding to a line on the main scale.

Nowadays, vernier calipers with digital displays or dial gauges are available. These reduce the complexity of choosing the coincidence of main scale and vernier scale and calculating the final reading as in manually operated vernier caliper.

But due to less cost, manually operated vernier calipers are more popular. Micrometer Screw Gauge: To measure diameter of thin wire or thickness of thin metal sheets with accuracy, micrometer screw gauge is very useful. It has U-shape frame with fixed sleeve. Rotating thimble movement is converted to linear movement of spindle. Main scale and vernier scale are displayed on sleeve and thimble respectively.

In the case of the micrometer screw gauge, the least count is the ratio of pitch to the number of divisions on the circular scale. Here the distance moved by the spindle per revolution is termed as "pitch. The ratchet will take care of the excessive pressure on the wire. So the final diameter of wire can be given by the formula.

A digital version of the micrometer screw gauge which gives a direct reading is also available. For special engineering applications like "over-pin diameter of gear" measuring, gear tooth micrometers are provided with ball-anvil spindles which can be changed according to gear profile. Tooth thickness micrometer measures "root tangent of a gear. Dial Indicators: Measurement of deflection is needed in many industrial applications. Examples of this include measurement of the movement of a car body while testing in bending moments and checking the waviness of a surface of a machined component.

In both cases, small linear displacements are to be measured with accuracy. Dial indicators, mounted on magnetic stand provide accurate measurements of deflection for the parts under study.

They are also available in an electronic version. Height Gauge and Surface plate: Accurate height measurement of machined components can be done with a height gauge placed on a surface plate. The working principle of a height gauge is similar to the vernier caliper. It is available in all the three types, i. The surface plate is a thick solid granite plate placed horizontal to the ground. A sharp pointed scriber is provided on the gauge to make a mark on the object.

The object to be measured for height is placed on the surface plate. With the help of an adjusting screw, the scriber can be moved up and down. Here we discussed the precision measuring instruments for linear measurements widely used in industry according to their features. Bright Hub Engineering. Skip to content Types of Precision Measuring Instruments Used in Industry With a need to make quality products which meet design specified tolerances, a large number of firms, research and development centers, and school and college laboratories use measuring instruments that have high accuracy and precision.

More Info. Popular Pages What is Measurement? What are Mechanical Measurements? Privacy Policy.

With a need to make quality products which meet design specified tolerances, a large number of firms, research and development centers, and school and college laboratories use measuring instruments that have high accuracy and precision. The special branch of science that deals with such instruments is known as metrology. Here we will look at the features and use of certain well known precision measuring instruments used for linear measurement.

While it may be true that you can never have too many tools, some of the most useful tools you should have in your toolbox are not chromed or made with safety-grip handles. Some of these measuring tools are not cheap, but each performs at least one essential function that professional mechanics and manufacturers use on a regular basis and that you may someday also have a need for. Usually, you discover you need them right in the middle of a job, so it is a good idea to be preemptive and acquire these measuring tools as time and money permit. We list these tools roughly in what we consider order of importance, but you can set your own priorities based on use and cost. Vernier Caliper An accurate sliding rule measuring tool, similar to micrometers, that can be used to measure inside and outside diameters as well as depths. There are several different kinds of vernier caliper; the earliest units were merely slide rulers with opposing stepped jaws; however, other versions with the addition of a dial face make even more accurate measurements on a smaller scale.

Types and Use of Precision Measuring Instruments

A coordinate measuring machine CMM is a device that measures the geometry of physical objects by sensing discrete points on the surface of the object with a probe. Various types of probes are used in CMMs, including mechanical, optical, laser, and white light. Depending on the machine, the probe position may be manually controlled by an operator or it may be computer controlled. CMMs typically specify a probe's position in terms of its displacement from a reference position in a three-dimensional Cartesian coordinate system i. In addition to moving the probe along the X, Y, and Z axes, many machines also allow the probe angle to be controlled to allow measurement of surfaces that would otherwise be unreachable. The typical 3D "bridge" CMM allows probe movement along three axes, X, Y and Z, which are orthogonal to each other in a three-dimensional Cartesian coordinate system.

Coordinate-measuring machine

Mechanical gauges are instruments that measure pressure, dimensions, levels, etc. They can be mechanical or electro-mechanical devices and offer displays ranging from direct-reading rules to digital LCDs. Gauges which measure pressure are classified as analog or digital depending on their readouts. Dimensional gauges are classified by what they measure, be it bore diameter, depth, or height, and are specific to machining processes.

Ruler and scales : They are used to measure lengths and other geometrical parameters. They can be single steel plate or flexible tape type tool.

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. For different types of machinery and systems, various measuring tools, instruments and gauges are used on a ship. Measuring instruments and gauges are used to measure various parameters such as clearance, diameter, depth, ovality, trueness, etc. These are critical engineering parameters, which describe the condition of the working machinery. Below, 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. There are many instruments, tools and gauges which are used on a daily basis onboard ship for measurement, fault finding, wear down etc. They are used to measure lengths and other geometrical parameters. This tool is one of the most famous measuring instruments in mechanical engineering.

Types of Mechanical Gauges

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Беккер ощутил тупую боль в желудке. - У кого же. В глазах Клушара вспыхнуло возмущение. - У немца.

Ruler and scales They are used to measure lengths and other geometrical parameters. This tool is one of the most famous measuring instruments in mechanical engineering. They can be a single steel plate or a flexible tape type tool. They are usually available in the measuring scale of inch or cm.

Different Types of Mechanical Measuring Tools and Gauges Used on Ships

Он не мог поверить, что дожил до подобной катастрофы. Он отдал распоряжение вырубить электропитание, но это все равно произойдет на двадцать минут позже, чем следует. Акулы со скоростными модемами успеют скачать чудовищные объемы секретной информации через открывшееся окно.

Из размышлений об этом кошмаре его вывела Соши, подбежавшая к подиуму со свежей распечаткой. - Я кое-что нашла, сэр! - возбужденно сказала.  - Висячие строки в источнике. Альфа-группы повсюду.

Types of Gauges - A ThomasNet Buying Guide

Он отбросил бесполезный мотоцикл и пустился бежать со всех ног. К несчастью для Беккера, вместо неуклюжего такси Халохот обрел под ногами твердую почву. Спокойно подняв пистолет, он выстрелил.

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