Measure Correct – measuring tools and measuring instruments
Measure Correct - measuring tools and measuring instruments
A good project include good measuring equipment. The only way to work precisely is possible and all the pieces fit together later exactly. As good measuring devices facilitate the work, because measuring tasks can run lighter and no unnecessary work is wasted.
Therefore, there is for each type of measurement in accordance with appropriate measuring tools in different accuracy ranges. While cooperating metal parts must be made accurate to one hundredth of a millimeter sometimes, millimeters or centimeters are sufficient for other work. Therefore hardly a handyman will need all measuring tools.
For a first impression, we present the most common measuring equipment here.
Measuring tools and instruments: Articles Overview
- Electronic rangefinder
- Ruler, meter rule, folding rule
- Measuring tape and a roll meter
- Calipers and vernier caliper
- Fine micrometer
- steel rule
Ultrasonic Range Finder
The ultrasonic rangefinder makes itself, as the name suggests, the ultrasound to the benefits. Although the technology behind it is complicated, the function is relatively simple. A transmitter transmits ultrasound signal and measures the time until it comes back to the unit. From the required time, the exact distance can be measured. However, sound spreads wide and therefore it is difficult to determine an exact measurement point. Therefore, the ultrasonic distance measurement is mainly suitable only for large areas.
To the point it brings the laser rangefinder. This works similar to the ultrasonic range finder, but used a light pulse. This can be precisely directed at a point and therefore does not require large areas. However, lighting and reflective surfaces can affect the measurement result.
Ruler, meter rule, folding rule
Inch Stock (meters rod members scale)
Ruler, yardstick or, strictly speaking, the folding rule. All titles the same thing and everyone knows what is meant by this - the foldable measuring means which everyone has and is still looking for.
The folding rule is available in various lengths and designs. Depending on the application purpose, it may be made of wood, plastic or metal. Commonly used are lengths of 2 m and materials, such as wood or plastic. About the quality of the accuracy class, which is indicated by the Roman numerals I, II and III decides. but also the joints of limbs scale are important. While metal joints promise to folding rules Wooden durability, plastic folding rules are often milled very accurately and snap exactly one at 0 °, 90 ° or 180 °. Likewise, some folding rules have to measure the opportunity angle, but this is quite inaccurate and therefore only a guideline. The folding rule is the most widely used measuring equipment in the DIY sector.
Measuring tape and a roll meter
The tape measure or a roll meter is a very space-saving measuring equipment. In a fairly small housing a measuring tape may be housed in different lengths. By default, measurements common to 2 m as well as tape measures 5m are not uncommon. Longer tape measures up to 50 meters are often built open and the strap is made of fiberglass.
The accuracy the measuring tape is specified in the EC accuracy class. The Roman numerals are 1 - 3 for the following possible deviations over a length of 10 m:
Measuring tape or a roll meter
- I: ± 1.1 mm
- II: ± 2.3 mm
- III: ± 4.6 mm
Even with a roll meter indoor measurements. There are decisive criteria. Even if that is criticized because of ignorance that the end hook is loose and can be moved, so no exact measurements would be possible without this loose fit. For outdoor measurements when the end hook is hooked behind the piece to be measured, this little pulls out and the inside of the hook is the zero measure. Is pressed with the inner measurements of the hook against an edge, it pushes slightly pure and the outer edge is set to zero. The end hook has therefore getting as much game as the sheet is strong, from the end hook is made. Additionally, it is possible that a roll meter is equipped with an additional viewing window. In this the rear side of the measuring tape is visible with an additional scale. This is exactly offset by the width of the Rollmaßgehäuses and thus shows in internal measurements in the length between end hook and the housing outer edge.
Calipers and vernier caliper
Calipers - vernier caliper
The caliper or vernier caliper is a measuring device to measure dimensions in the tenth area. Due to the design this measuring means is very well suited for the measurement of diameters, as in the determination of screw sizes. Additional peak measuring jaws (top) allow for precise determination of internal dimensions or holes. Optional calipers are provided with a depth, which is suitable for the determination of borehole depths or paragraphs. No matter which measurement (external, internal, or depth measurement) is executed, it will always read the same way. This means that the two principal limbs are applied to a 12 mm screw, also have the pointed legs for measurement of 12 mm and the depth is exactly 12mm out.
Reading on the calliper
The use and reading of a vernier caliper requires some practice, but it can be learned relatively quickly.
- For this purpose, the two measuring jaws are applied to the workpiece to be measured and verified, at which point the scale of the vernier (movable part) is applied to the main scale. The zero line determines the Millimetermaß what in the example 13 mm is. the first graduation does not apply to a division on the main scale, the previous counts. Even if he is closer to the next tick.
- To determine the tenth measure, it is checked after which subsamples the vernier is exactly one graduation of the main scale. In the example, it is the 5. Tick. The measured dimension is thus 13.5 mm
Fine micrometers (microns) are used, as the name suggests, the fine measuring in hundredths area. In the DIY sector, such accuracies are rarely needed.
In order to enable such accurate measurements, two hardened measuring surfaces are screwed together via a thread with a very small pitch. A slip clutch or ratchet prevents the bolt thereby build up a pressure and falsify the measurement result. Depending on how far the measuring screw can together, the dimension is displayed. Since a micrometer is restricted in their range, they are available in increments of 25 mm.
Most measuring screws have a pitch of 0.5 mm. This means that two rotations result in a change in length of 1 mm, which makes it difficult for some to read a micrometer correctly.
The steel rule is not only an auxiliary means for measuring, it can also be good use for marking. It can be easily bent and measure allows to scribe and round surfaces.
Also on metallic surfaces, the steel rule is to run hard enough to it a drawing pin to crack initiation. There are different lengths and thicknesses. Long thin dimensions can be rolled up and so the roll meter very similar.