How much do you know about steel ruler and tape measure?

Original title: How much do you know about steel ruler and tape measure? Tape measures are very common to everyone, and now almost everyone has one at home. Steel tape has a wide range of applications. It can be used to measure the size or distance of long workpieces. It is widely used in construction and decoration. It is a good helper in people's work and life. Today, the editor of Xiyu Mall will mainly explain to you the standards of steel tape verification regulations, the composition of components and their uses. Standard for verification regulation of steel tap This regulation is applicable to the verification of newly manufactured and in-use ordinary steel tapes, depth-measuring steel tapes and steel tape. 1. Steel tape is a measuring tool for measuring length, which is generally divided into four types according to its structure, as shown in the following figure. Expand the full text The standards for the verification regulation of steel tape are as follows: This regulation is applicable to the verification of newly manufactured and in-use ordinary steel tapes, depth-measuring steel tapes and steel tape. Steel tape is a measuring tool for measuring length, which is generally divided into four types according to its structure, as shown in the following figure. 2. Verification items and conditions (1) Verification conditions ? Verification temperature The temperature shall be (20 ± 5) ? when verifying the steel tape of engineering grade; The temperature shall be (20 ± 8) ? when the steel tape of Grade 11 is verified; The verification temperature of the steel tape is (20 ± 8) ?. ? Tension of steel tape during verification 1) The tension for verifying the common steel tape and steel tape is 49 N. 2) The tension of the steel tape for depth measurement shall be 9.8 N for the light rudder and 15.7 N for the heavy rudder according to the mass of the ruler. 3) The tension of steel tape with nominal length less than sm and arc tape is not specified during verification. Note: The tension can also be determined according to the user's requirements, but it should be indicated on the verification certificate issued, and the correction and measurement uncertainty should be given. The error of tension shall be less than IN. ? Before verification, the constant temperature time of the ruler to be verified at the specified temperature shall not be less than 4ho. (2) Verification items and tools of steel tape The verification items and verification tools of steel tape are listed in Table 1. 3. Technical requirements and verification methods (1) Appearance and interaction of each part ? Requirements 1) The pulling out and winding of the steel tape shall be light and flexible without jamming, and each functional device shall be able to effectively control the winding of the tape. 2) Lay the tape on the verification table with specified tension. The tape surface shall be free of unevenness and distortion. Both edges of the tape shall be smooth and free of sharp edges and burrs. The width of the tape shall be uniform. The hook of the ruler shall be kept at a right angle, and there shall be no deviation visible to the eye. 3) The surface of the tape shall be provided with an anticorrosive coating, which shall be firm, smooth and clean, with uniform color and luster, and free of obvious bubbles, peeling, wrinkles, rust, spots, scratches and other defects. 4) All graduation lines of the tape must be uniform, clear and perpendicular to the edge of the tape,printed tape measure, and there shall be no double lines or missing lines. Individual lines are allowed to have broken lines not greater than the width of the line. 5) The distance from the zero line of the ordinary steel tape and steel tape to the pull ring is generally 100 ~. The end line is 250 ~ from the mouth of the ruler box. The zero position of the steel tape for sounding is at the end of the ruler, and the end line is 250 ~ from the mouth of the ruler box. 6) The division value of ordinary steel tape is 1 ~, 5 ~ and 10 ~, and their line lengths shall be significantly different. The division value of sounding steel tape and steel tape is 1 ~. Lines of the same kind shall be of equal length. 7) Within each decimeter (DM), the centimeter (cm) graduation line shall be marked with the numerical value in centimeter (cm). For a steel tape with a total length of less than sm, the lines of the decimetre (DnL) and meter (m) divisions shall be marked with a value in centimeters (cm) from the zero line. For a steel tape with a total length of more than sm, the value in centimeter (cm) shall be marked within each meter (m) for the decimetre (DM) division line, and the value in meter (m) shall be marked one by one from the zero division line; the unit of m may not be marked after 10 m. 8) The connection parts of the steel tape shall be firm and reliable, and not easy to produce tensile deformation. 9) The straightness of ordinary steel tape with arc-shaped section shall be: when the tape extends horizontally to the length specified in Table 2,bespoken tape measure, it shall not be folded down. Table 2 10) When the tape of the steel tape encircles a circle with a diameter of 30 mm at any position, the tape shall not be tortuous, and shall recover naturally after being released. Plastic deformation is not allowed, and cracks are not allowed on the coating. 11) The full length, model, manufacturer name (or trademark), MC mark, factory number and production date shall be marked on the tape or box of the steel tape. Numbers and words must be clear and neat. The surface of the ruler box (or frame) shall be bright and clean, and free of cracks, rust and defects. The appearance of the new steel tape and the interaction of each part shall meet the following requirements. The steel tape in use shall not have appearance defects that affect the accuracy. ? Verification method Test and visual observation. (2) Line width ? Requirements See Table 3 for line width and error. ? Verification method In case of any doubt in visual observation, a reading microscope with a division value of 0.01 mm can be used for verification. (3) Indication error ? Requirements 1) Zero error The zero error of the steel tape for sounding is the error from the end of the tape to the 500 mm line, and the allowable error is ± 0.5 mm. 2) The allowable error II between any two lines shall be calculated by the following formula according to different accuracy grades of the steel tape under the standard condition of verification: Grade: = ± (0.1 + 0.IL) mm Grade: = ± (0.3 + 0.2L) mm Where L is the length in meters, and when the length is not an integer multiple of a meter, the nearest larger integer "meter" number is taken. For ordinary steel tape of the ring or hook type (i.e., the zero point is on the end face of the ring or hook), the absolute value of the allowable error from one end face of the tape to the interval length of any line may be increased: It is 0.1? For the working scale and 0.2mm for the 11-grade scale. Note: The allowable error of the steel tape for sounding is the allowable error between any two lines after 500 ~ lines. 3) See Table 4 for the allowable error of millimeter and centimeter divisions. The industrial grade steel tape in use is allowed to be degraded for use if it fails to meet the industrial grade requirements after verification. ? Verification method 1) Verification method of zero error Lay the ordinary steel tape with hook or pull ring at the end of the tape on the steel tape verification table, and compare it with the qualified standard steel tape after applying the specified tension. Align the ruler hook (or pull ring) indicating the zero position with the zero line of the standard steel tape, and read the error value at 100 ~. The zero error of the sounding steel tape is verified with a zero calibrator, mini tape measure ,personalized tape measure, as shown in Figure 2. 1 — baffle; 2 — V-shaped support; 3 — ruler; 4 — ruler belt; 5 — pulley; 6 — ruler First, place the ruler of the tested deep steel tape on the V-shaped support of the zero calibrator, make its front end face close to the zero position baffle of the zero calibrator, and place the tape on the table of the calibrator along the axis of the ruler. At this time, read the zero error at the 500 mm line marked on the table of the calibrator. 2) Verification method for indication error of steel tape at any section Use the qualified Class I standard steel tape on the steel tape verification table to compare and measure with the tested ruler (the friction between the steel tape verification table and the tested ruler shall be ? 4 N). Firstly, the standard steel tape and the verified steel tape shall be fastened on the verification table by the compacting device, and the tension shall be applied to the other end of the standard steel tape and the verified steel tape respectively as required. Adjust the zero adjustment mechanism on the verification table to align the zero line of the verified ruler with that of the standard ruler (for the steel tape for depth measurement, the line at 500 ~ is aligned with that of the standard steel tape), and continuously read the error of each section and the total length section by section per meter. For the steel tape with a total length of less than 3m, the inspected section shall not be less than 3 sections. The indication error between any two lines shall be evaluated by selecting 2 to 3 sections within the full length range while being verified meter by meter, and the indication error shall not exceed the allowable error of the corresponding section. When the total length of the ruler to be verified is greater than the length of the verification table, the sectional method can be used for verification, and the total length error is the algebraic sum of the errors of each section. The indication error of the circumference ruler shall be verified first, and then the indication error of the diameter ruler. At this time, the reading microscope with a division value of 0.01 mm must be used to aim at the reading. The indication error of millimeter and centimeter division shall be verified with a reading microscope with a division value of 0.01 mm when there is any doubt. The indication error can also be verified by other methods whose measurement uncertainty is 1/4 ~ 1/10 of the allowable indication error of the verified ruler. (4) Indication error of the tested steel tape It shall be the algebraic sum of the reading of the inspected point and the corrected value of the standard steel tape. The indication error of the steel tape for sounding is the algebraic sum of its zero error and the indication error of the tape after 500 mm. 4. Processing of verification results and verification period (1) Processing of verification results After verification, the steel tape conforming to the provisions of this regulation shall be stamped with the corresponding grade, and the verification certificate shall be issued. The correction value of the depth measuring steel tape shall be given in the verification certificate. A verification result notice shall be issued for the unqualified. (2) Verification period The verification period of steel tape in use is generally half a year, and the longest period shall not exceed one year. Components of steel tape The tape measure is mainly composed of a shell, a tape strip, a brake, a tape hook, a lifting belt, a tape spring, an anti-falling protective sleeve and a label. The specific functions are as follows: 1. Shell: ABS new plastic, with glossy texture on the surface; resistant to falling, wear-resistant and not easy to deform. 2. Ruler strip: 50 # Grade I strip steel with a thickness of 10 threads (0.10 mm) is used; the surface of the ruler is the most advanced environment-friendly paint: tasteless, smooth and wear-resistant, with bright colors and clear and bright scales. 3. Braking: With upper, side and bottom three-dimensional braking, the hand control feeling is stronger. 4. Ruler hook: The rivet ruler hook structure is not easy to deform and ensures more accurate measurement. 5. Lifting belt: two types of rubber and nylon; high-grade and high-quality; strong and durable, with good hand feeling. 6. Ruler spring: generally made of 50 # carbon steel and 65 # manganese, with strong toughness and high accuracy. 7. Anti-fall protective cover: high-quality plastic to prevent falling and collision damage and enhance durability. 8. Labeling: Labeling production can be carried out according to customer requirements. Use of steel tape 1. Composition and principle The tape measure is mainly composed of a tape, a disc spring (clockwork spring) and a tape measure shell. The so-called disc spring is like the clockwork in the old chain clock. When the graduated scale is pulled out, the disc spring is wound up to generate a rewinding force, and when the pulling force of the graduated scale is released, the graduated scale can be pulled back by the pulling force of the disc spring. 2. Distance measurement The commonly used distance measurement methods are tape distance measurement and electro-optical distance measurement. Measuring with a tape measure is to measure along the ground with a tape that can be rolled up. It belongs to direct distance measurement. Electro-optical ranging is to use instruments to transmit and receive modulated light waves between two points, and to measure the distance according to its propagation speed and time, which is called electronic physical ranging. Electro-optical ranging belongs to indirect ranging. 3. Distance measurement with tape measure Types of Tape Measures and Spacing Tools There are steel tapes and tape measures with lengths of 20 m, 30 m and 50 m. 4. Distance measurement Generally, the whole length of n is measured first, marked on the ground with a measuring drill or a line, and finally the remaining length is measured. The total length is: NX ruler section length + surplus length In order to prevent errors in measurement and improve measurement accuracy, round-trip measurement is required. The difference between the forward measured length and the backward measured length, divided by the probable value of the length, is converted into a fraction with a numerator of 1, which is called relative error, or relative accuracy. The relative accuracy of the steel rule gauge shall generally not be less than 1/3000. The standard length L is between the two end points of the scale field, which is measured by the identified steel ruler. L 'is obtained by temperature correction, and (L-L')/L is the correction per meter. Multiplied by the nominal length, the correction is obtained Length correction of steel tape gauge (1) When the correction value of ruler length is greater than 1/10000 of the ruler length, the ruler length correction shall be increased; (2) When the difference between the temperature during span measurement and the standard temperature is plus or minus 10 degrees, the temperature correction shall be added; (3) When the ground slope measured along the ground is greater than 1.5%, the height difference correction shall be added. Steel tape is the main type of tape, which can be divided into self-rolling tape, braking tape,bra measuring tape, rocking tape and so on. The use of steel tape is also relatively simple, but attention should be paid to the operation, improper operation or carelessness will be scratched. Return to Sohu to see more Responsible Editor:. tape-measure.com

Original title: The man who dreamed of turning himself into an alien expressed his satisfaction after the successful operation. Introduction: French h...

BookCase Walls in NYC - Bookcase walls allow you to create a smooth transition between spaces, and looks like a part of the house itself, +1 (646) 494...

Vedic Learnings - It can be a meaningful and life-long quest to study Vedic philosophy and teachings. Here is a road map to assist you travel the le...

MetaMask Login Chrome makes it easy for you to access your Ethereum-based digital asset and dApps safely. MetaMask is one of the most popular cryptocu...

Aging is an inevitable part of life, and as our loved ones grow older, it becomes essential to provide them with the care and support they need. Swarn...

Digital Seva Portalis the best Digital India Portal...