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Since it is manufacturing based on a JIS standard, in the state (state where KOMBEKKUSURURU and a thin width tape measure do not apply tension) where predetermined tension was applied in the line which becomes an axis direction on the basis of the temperature of 20 degrees C, it becomes as the following formula according to the arbitrary length from a reference point, and the length between arbitrary 2 scale lines.
The 1st grade:±(0.2+0.1L）mm L : Measurement length (m)
* In the case of the tape measure on the basis of edge side, the tolerance from a reference point adds ±0.2mm to the value of an upper type.
The next calculation rectifies.
Correction-for-pull type
Lp = (P-PO) L / A ⋅ E
Lp ：The flexible value by tension (mm)
P ：Tension at the time of measurement (N)
P0 ：Standard tension (N)
L ：The length of a tape measure (mm)
A ：Cross-section area of a tape measure
* Comet = 2.32mm2
Comet mini = 1.29mm2
Steel = 2.60mm2
Stainless steel = 2.60mm2
E ：Elastic coefficient
* Comet = 20.6x104 (N/mm2)
Comet mini = 20.6x104 (N/mm2)
Steel = 20.6x104 (N/mm2)
Stainless steel = 19.3x104 (N/mm2)
Correction-for-temperature type
Lt=Ld(T-20)
Lt ：The flexible value by temperature (mm)
L ：The length of a tape measure (mm)
T ：Temperature at the time of measurement (degree C)
d ：Coefficient of linear expansion
* Comet = 11.5x10-6(/degree C)
Comet mini = 11.5x10-6(/degree C)
Steel = 11.5x10-6(/degree C)
Stainless steel = 14.0x10-6(/degree C)
* Since the above-mentioned numerical value is the thing of product of our company, in use of the product of the other company, please ask each maker.
Moreover, since it is also when "the cross-section area of a tape measure" becomes specification change also in product of our company, when rectified, please give me affirmation.
Since clear (transparent melamine resin) coating on the surface of a tape is dried at \200 degrees C, use in not much hot environment cannot be performed.
It is the JIS standard which fulfills the following conditions. A tape measure calls, the mass of that a size is 5m to 200m, and it is a 5m integral multiple and a weight comes out 200g-2, and it is a certain thing.
In addition, if three points, an inspection report, a proofreading certificate, and traceability, can be arranged and obtained, it can respond to ISO.
Especially sizes other than a standard weight are not specified. In addition, the standard weight of our company is a 350g product made from true brss.
It is not a JIS standard. Moreover, in ISO, they are an inspection report, a proofreading certificate, and a traceability of calobration accuracy. It can respond, if three points of documents can be arranged and obtained.
Since a scale has thickness compensation by carrying out, a reading becomes a diameter as it is.
The tolerance at the time of the inspection in our company (difference of an actual measurement and a calculation value) is as in the following tables.
| Measurement range | Diameter(V-type) | Diameter(VH-type) |
|---|---|---|
| Less than 3000mm | Less than ±0.10mm | Less than ±0.03mm |
How to calculate a calculated value
{（Measurement range）+（thickness of a tape）} x pi
* Unit. mm
* By our company pi= 3.14159 It has calculated.
When a tape is wound around a measured thing, shrinkage tape external surface is extended by the inside of a tape. Since it will be in the state where there are no expansion and contraction at the center of tape thickness at this time, compensation of thickness is set to (1/2of thickness)+(1/2 of thickness by the side of opposite) =1.
Therefore, when thickness is 0.2mm 0.1+ opposite side
0.1=0.2mm becomes a compensation value.
Although it is possible, the use as a standard will be the requisite.
Since thickness compensation has been carried out, when using a standard outside diameter tape for the diameter measurement of inner, the numerical value which added the twice of tape thickness to the reading becomes a diameter.
It is not attached to a standard article.
Although an in-house inspection report can be attached if there is a demand, it takes the time for delivery for about two weeks. Moreover, when a proofreading certificate and a traceability system figure are required, combine. Please request.
The thing of specification in which the tape has appeared from the rolling-up case tip is not preparing.
The tape of our company is produced by the standard which does not let a tip pass fundamentally. It is because wear on the surface of a tape is brought forward by letting a tape pass at the tip of a case and exfoliation of clear coating and scale ink occurs early.
