Standard steel tape composition and the principle of measuring tape is mainly composed of feet, disc spring (clockwork spring), tape shell of three parts, the so-called disc spring, spring is like a chain on the old clock. When pulled scale, disc spring is wound tight, have to rollback the force, when loosen the tension of the scale, scale were disc spring pull back. Tape measure is also called the measuring tool, eighty-five bra measuring tape percent of the world's tape all exports from China! Thus it can be seen that the Chinese construction importance in the world. Can see more diligence of the Chinese people, contributing to the world's infrastructure. The outside diameter of is a kind of measuring things, such as measuring the length of the table. This time need to use feet hook at the end of the table, and then pull the tape measure to the other side of the table. Process, due to the flexible steel tape ruler hook, hook will and feet with the front end of the hair, there is a crack, a crack is 1 mm, this article makes up for the 0 mm - 1 mm distance, the measuring accuracy. Hook tape ruler of flexible steel tape is a very important quality requirements. We observe a steel tape ruler with front end, feet of belt scale is not started with 0 mm, but starting from 1 mm. This means that when you measure a object, feet with display is 10 mm, actually only 9 mm. Flexible feet hook can solve this problem well.
Standards for the outer diameter of steel tape is a kind of measuring things, such as measuring the length of the table. This time need to use feet hook at the end of the table, and then pull the tape measure to the other side of the garment measuring tape table. Process, due to the flexible steel tape ruler hook, hook will and feet with the front end of the hair, there is a crack, a crack is 1 mm, this article makes up for the 0 mm - 1 mm distance, the measuring accuracy. Another is the inside diameter of measuring things, or measuring scale hook to hang, such as measuring the width of the door. At this time to make feet hook to the wall, and then stretched feet with measurements. When the foot hook to resist metope, feet hook and feet is close to the front, the thickness of the feet hook is 1 mm, the thickness of the feet hook just makes up for the 0 mm - 1 mm distance, the measuring accuracy. Visible, feet hook must be loose! Loose steel tape ruler of the hook is not fake, also won't bring measurement is not accurate, but the clever design of the steel tape is deliberately. This design saved steel tape in various environments measurement accuracy, widening the scope of use of steel tape. Pull tape after fixed tape seamstress measuring tape can roll up because tape with spring inside, pull in measuring length, actual it is stretched and the length of the spring scale, once your measurements, the inside of the tape spring automatically contraction, rod under the action of spring force also follow contract, so the tape will be rolled up. This instrument is suitable for the new manufacturing, verification of the steel ruler. Summary of steel tape verification platform steel ruler including ordinary steel ruler and cotton fiber steel rule 'is measuring the length of the measuring tool, made of stainless steel sheet; Under the feet of scribed line on the cable lines on both sides. Ordinary steel ruler of nominal length is 150300500 (600), 1000, 1 500, 2 000 mm 6; Nominal steel rule of cotton fiber length is 50 mm. The square end of the scale to work side, the other end of circular arc form and with hanging hole, test items and test conditions for steel ruler verification of error of indoor temperature should be within the range (20 + 5) ℃. Gauging and test tools in interior equilibrium temperature time should be no less than 2 ho
