Metal measuring tape rng

Features and scope

Unlike conventional construction and hydrogeological tape measures, the size of which is often limited to 10 meters, the geodetic model is distinguished by its long length, reaching 30, 50 and even 100 m. Moreover, 100-meter tapes are the most popular. There are also 20-meter samples, however, due to their insufficient length, they are much less often used by specialists.

All geodetic models are designed to work in extreme climatic conditions and are capable of operating in a temperature range of -40 to 50 degrees and 100 percent humidity. Moreover, thanks to the use of durable, but at the same time elastic materials, the tape is not afraid of knocks, breaks, strong bends and loops. Resistance to deformation is especially necessary when using the instrument on difficult terrain in difficult measuring conditions.

The scope of application of geodetic tape measures is quite wide. They are used to determine the distances between points located at a considerable distance from each other. The tool is indispensable for geodetic, cartographic and topographic works, as well as in construction and when surveying garden plots. It is used to measure age-related horizontal deformations of the land, determine the points of coordinates of various objects, carry out land surveying and spatial-geometric measurements with further application of the results to plans and maps.

In addition to geodesy and cartography, roulette is widely used in the development of territories and the formation of landscapes, as well as in athletics competitions, where it is used to measure the flight range of a spear, hammer or ball.

Device

Each roulette wheel necessarily has a standard set of components.

• Measuring cloth. This component is a thin metal or plastic strip with a measuring scale.
• Hook. It is a small metal protrusion that allows it to catch on the edge of the measured object. Also, some models have two hooks - one on the front side of the measuring scale, and the other on the inside.
• Frame. This is a plastic or metal frame into which the canvas is twisted.
• Locking mechanism. This component is located on the body in the form of a button. It allows the measuring web to be locked in one position.
• Spring. It is located inside the case and is responsible for winding the tape.

Popular models

The modern market for measuring equipment presents a wide range of geodetic tape measures. Below are the most popular samples, most often mentioned in the requests of Internet users.

The Chinese-made Matrix Master model corresponds to the second class of accuracy and is available with a measuring blade size of 12.5 mm x 50 m. The body of the product is made of impact-resistant plastic, and the handle has a two-component design and provides a comfortable grip. The model is equipped with a sharp tip that allows you to fix the device in the ground for long-distance measurements, and the measuring tape is covered with a polymer compound that is quite resistant to abrasion. The dimensions of the tape measure are 47x27x6 cm, the cost is 641 rubles.

You can see an overview of the GROSS 31480 geodetic tape measure below.

Verification

carried out according to MI 1780-87 “Sample tapes and metal measuring tape. Verification method ”.

Basic means of verification:

- micrometer MK25-2, GOST 6507-90;

- Vernier caliper ШЦ-11-250-0.05, GOST 166-89;

- universal measuring microscope of UIM-200E type, GOST 14968-69;

- comparator for checking tape measures according to MI 1780-87;

- measuring magnifier LI-3, GOST 25706-83;

- dashed length measure CL of the 3rd category, GOST R 8.763-2011;

- measuring tape of the 3rd category, GOST R 8.763-2011.

It is allowed to use similar verification tools that ensure the determination of the metrological characteristics of the verified measuring instruments with the required accuracy.

The verification mark is applied to the verification certificate.

Description

The principle of operation is mechanical. Roulettes consist of a measuring tape and a body. The measuring tape can be enclosed in an open housing with a handle, where winding and unwinding of the measuring tape is carried out using a handle, or in a closed housing where there is a device for automatic tape winding.

Measuring tapes are made of carbon or stainless steel and have a protective anti-corrosion coating: for carbon steel - enamel coating, for stainless steel - varnish coating. The scales of the tape measure are marked with millimeter, centimeter and meter intervals.

The pull-out end of the measuring tape of the tape measures is provided with a ring, hook or weight. The cargo has a cylindrical shape. Scale strokes and digitization are applied to the load, the bottom end of the load serves as the beginning of the scale.

Modification number - 27: R1U2K, R1N2K, P2U2K, P2N2K, R3U2D, R3U2K, R3N2K, R5U2D, R5U2K, R5U2G, R5N2K, R5N2G, R10U2K, R10U2G, R10N2G2G, R10U2K, R10U2G, R10N2G2K, RU210220210 , R50U2K, R50U2G, R50N2K, R50N2G, R100U2K, R100U2G, R100N2K, R100N2G, differing from each other in nominal tape length, design, overall dimensions and weight.

The device and principle of operation of the construction tape

The essence of the functions performed by the tape measure is the linear measurement of the length, width, height, girth of sufficiently voluminous objects.

According to the design principle, all modern tape measures are the same: a body, a measuring tape with a tip of different shapes, a reel and a special winding mechanism.

The working element is a flexible tape placed in the housing made of thin high-strength alloy steel or special types of elastic plastic.The stores offer tape measures of completely different lengths - from a meter to fifty, the most popular among home craftsmen - from 3 to 10 m.

The color of the canvas is usually yellow, the calibration of the divisions can be performed both in the metric system (usually just such are made for Russia), and in a combination of the metric and American, inch, system of measures. The color of the markings and numbers on the scale is bright black and red, made with a paint that is resistant to wiping and smudging.

According to the type of unwinding mechanism, these measuring instruments are classified into:

• hand-wound tape measures with a high degree of reliability and ease of use. These are roulettes with a handle, the mechanical rotation of which allows the tape to be wound onto a reel. The manual mechanism is used for industrial tools with a long belt (from 10 to 25 m), on which, due to design features, it is impossible to install a spring mechanism. As a household tape of this type, they are now extremely rare and in the very near future, they will probably finally pass into the category of rare ones.
• roulettes with a return mechanism - almost all household automatic roulettes now have a spring mechanism that rolls the working canvas to its original position inside the body. The device of such tape measures, as a rule, assumes the presence of one to three locking buttons for the convenience of temporary or permanent fixation of the tape at any position in the hand. Stoppers not only fix the tape at a certain mark, but also prevent spontaneous tape rewinding. A mechanism of this type is used for tape measures with a tape length not exceeding 10 m.
• In addition to the manual and spring mechanism, an electronic (digital) rewinding mechanism is also used. A tape measure of this type has an electronic device for reading measurements.

One of the most important parts of modern building tape measures is a curved magnetic tip located at the retractable base of the measuring band - it allows you to fix the edge of the tape, for example, on a metal structure, which is especially convenient when working alone.

A separate type is tape measure with a sinker, designed to measure the level of liquid in containers. Their design is a metal case with a manual return coil installed inside and a steel measuring blade with a weight fixed on the tip.

Geodetic tape is suitable for work on open construction sites or large land plots. The measuring sheet is usually completely covered with a layer of nylon to protect against abrasion of the scale markings applied on both sides, to ensure maximum protection of the tape against corrosion, and therefore the durability of the tool

The return mechanism has a high speed, and working with such a tape requires accuracy and care.

Laser rangefinders with precise measurements (up to 1 mm) are a new generation of construction tape measures. Even large-scale measurements or measurements of inaccessible heights without the use of a ladder can be performed by one person. Has a convenient function of storing the last measurements, which allows you to quickly calculate the measured surface area. Professional laser tape measures do not give measurement errors even in sunny weather. Powered by batteries.

Each roulette wheel necessarily has a standard set of components.

• Measuring cloth. This component is a thin metal or plastic strip with a measuring scale.
• Hook. It is a small metal protrusion that allows it to catch on the edge of the measured object. Also, some models have two hooks - one on the front side of the measuring scale, and the other on the inside.
• Frame. This is a plastic or metal frame into which the canvas is twisted.
• Locking mechanism. This component is located on the body in the form of a button.It allows the measuring web to be locked in one position.
• Spring. It is located inside the case and is responsible for winding the tape.

Dimensions (edit)

Modern manufacturers produce a huge number of tape models with different sizes. They are enshrined in a special GOST, which manufacturers adhere to.

Also, roulettes must comply with OKPD 2 - this is a general product classifier. In this case, we mean measuring instruments. In addition, there is a so-called accuracy class, which is provided by the same GOST.

Correspondence table of accuracy class and error of measuring tape at different lengths.

For household needs, a tape measure with a length of 3 m measuring web is enough.This length is quite enough for measuring various objects in everyday life - the height and width of the entrance doors, the height of the cabinets, etc. m or even 15 m.

Of course, the selection of the length of the measuring web will depend on the object being measured. More sophisticated measuring instruments are used on large construction sites and in various industrial facilities. Their length can be up to 50 m.

Design

Geodetic tape is a measuring device consisting of an open or closed shockproof housing, a built-in drum and a measuring tape wound around it. The reel is equipped with a comfortable handle that allows you to wind the measuring tape manually, or it is equipped with an automatic twisting system, which greatly facilitates the operation of tape measures when measuring long distances.

Hand drum systems are less convenient and require additional time to rewind the web. Models are produced with different ratios of revolutions, of which the most common are 1: 3 and 1: 5, meaning that in one rotation of the handle the drum makes 3 or 5 revolutions. Almost all models are equipped with a sharp peg, which, if necessary, is stuck into the ground and securely fixes the device. Roulette handles are often two-piece and feature ergonomic, comfortable shapes.

The measuring tape of tape measures can be from 125 mm to 2 cm wide and is made of metal or PVC. A scale is applied on its surface by etching, engraving or embossing, which does not fade or wear off during operation. The durability of the markings is due to the presence of a thin wear-resistant coating, which is always present on all types of belts. Polyamide, anticorrosive phosphate layer, synthetic resins, high-strength enamel or transparent wear-resistant varnish are used as a protective layer. The end of the measuring tape is often equipped with a special ring that allows the web to hook onto a peg driven into the ground, which is the starting point of reference.

Completeness

The scope of delivery of a tape measure with a pull-out end with a ring or hook includes:

- Measuring metal tape of 2 classes of accuracy;

- dynamometer DPU-10.1-2 (supplied at the request of the consumer);

- passport;

- packing box;

- RI.000.00 MP “Metallic measuring tapes of 2 classes of accuracy. Verification method ”.

The delivery set of the weighted tape measure includes:

- Measuring metal tape of 2 classes of accuracy;

- cargo;

- manual;

- packing box;

- RI.000.00 MP “Metallic measuring tapes of 2 classes of accuracy. Verification method ”.

Description

Metallic measuring tapes are a metal tape with an applied measuring scale at millimeter intervals, placed in a case with a winding mechanism.

Roulettes are produced in several modifications, the distinctive features of each of which are shown in Table 1.

Table 1

3m

5t -

General view of roulettes is shown in Figures 1 - 26.

G

Figure 4 - General view of TL3M roulettes

-G.* "

- ‘’ Z1 “1 /

Figure 22 - General view Figure 23 - General view

tapes TS20 / 2, TS30 / 2, TS50 / 2 tapes TR20 / 5, TR30 / 5,

TR50 / 5

Figure 26 - General view of PR100 / 5 roulettes

Types and brands

Before buying a measuring tape, you must familiarize yourself with the methods for calibrating measuring instruments. These methods are established in a special law "State system for ensuring the uniformity of measurements".

There are also some very specific types of roulettes.

• For example, roulette Р20УЗГ. This device is used to measure the level of oil products in tanks. The appearance of such a roulette wheel differs from the standard one. It has a handle on which a measuring blade made of carbon steel or stainless steel is located, and a weight is fixed at the end of the blade.
• One of the most popular and reliable tape measures with a length of 10 m is a product with a lot P10UZK. This tool has a GOST test and can be used both in everyday life and on serious construction sites.
• A similar model, but with a smaller size, is the Р5УЗК. This tape has a web length of 5 m. Usually the number in the title means the maximum length.

• A convenient option for construction is the Fit 17720 tape measure with a length of 20 or 30 meters. This length is sufficient for measuring even large objects. The product has a plastic case, and the measuring blade is made of steel. Steel measuring webs guarantee the durability of the device. There is also a strap on the body of the instrument for convenience.
• An excellent option for household needs is a product from the Target manufacturer. This device has a rubberized housing that fits perfectly in the hand, and the parameters of the measuring blade are 3 mx 25 mm. This width is much wider than that of standard tape measures. This ensures excellent visibility of the scale.
• There are also adhesive tapes such as Tajima Pit. In fact, this is no longer a tape measure, but a measuring blade without a case, which is glued to the required surface. The length of this tape can be completely different. As you can see, today there is a large selection of different roulettes.

You can find out how to choose a roulette by watching the following video.

Tags: measuring, tape measure