ASTM B428-93(2004)
(Test Method)Standard Test Method for Angle of Twist in Rectangular and Square Copper and Copper Alloy Tube
Standard Test Method for Angle of Twist in Rectangular and Square Copper and Copper Alloy Tube
SIGNIFICANCE AND USE
The rectangular or square copper alloy tube covered by this test method may be used in applications in which control of twist is important to proper fit in final assembly and to minimize rework to bring the tube into compliance. It is recognized that the amount of twist, in degrees, per increment of length can change as a result of the weight of the product and its length during measurement.
This test method provides a procedure for measuring the twist in square and rectangular copper and copper alloy tubes as a measure of the deviation from straightness.
This test method allows the purchaser and supplier or manufacturer to inspect square and rectangular copper and copper alloy tube with a standard technique that provides acceptable twist in delivered tubes.
SCOPE
1.1 This test method establishes the requirements for the determination of the angle of twist in rectangular and square copper and copper alloy tube.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B 428–93 (Reapproved 2004)
Standard Test Method for
Angle of Twist in Rectangular and Square Copper and
Copper Alloy Tube
This standard is issued under the fixed designation B 428; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Procedure
1.1 This test method establishes the requirements for the 4.1 Place the tube specimen lengthwise on the reference
determination of the angle of twist in rectangular and square plane. Whenever the specimen has noticeable edgewise curva-
copper and copper alloy tube. ture, place the specimen so that a side having convex curvature
1.2 This standard does not purport to address all of the is in contact with the reference plane. Further placement
safety concerns, if any, associated with its use. It is the requirements are as follows:
responsibility of the user of this standard to establish appro- 4.1.1 For rectangular tube, place a major outer dimension
priate safety and health practices and determine the applica- side (width side) against the reference plane, as shown in Fig.
bility of regulatory limitations prior to use. 1.
4.1.2 For square tube, having curvature along all edges,
2. Significance and Use
place the specimen so that the side with the least convex
2.1 The rectangular or square copper alloy tube covered by curvature is against the reference plane.
this test method may be used in applications in which control
4.2 Clamp one end of the specimen so that the tube surface,
of twist is important to proper fit in final assembly and to adjacent to that end and facing the reference plane, will be in
minimize rework to bring the tube into compliance. It is
firm contact with this plane. Keep the other end of the
recognized that the amount of twist, in degrees, per increment specimen free.
of length can change as a result of the weight of the product
4.3 Position the protractor segment flush against the free
and its length during measurement. end of the specimen, as shown in Fig. 2, and measure the total
2.2 This test method provides a procedure for measuring the angle of twist by reading the degrees for that angle line which
twist in square and rectangular copper and copper alloy tubes
most nearly coincide with the lower outside edge of the tube
as a measure of the deviation from straightness. end. In making this reading, keep the lower edge of the
2.3 This test method allows the purchaser and supplier or
protractor segment in contact with the reference plane or hold
manufacturer to inspect square and rectangular copper and it parallel to this plane by use of the parallel
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
e1
Designation:B 428–93 (Reapproved 1998) 2004)
Standard Test Method for
Angle of Twist in Rectangular and Square Copper and
Copper Alloy Tube
This standard is issued under the fixed designation B 428; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
e NOTE—Fig. 1 has been editorially changed.
1. Scope
1.1 This test method establishes the requirements for the determination of the angle of twist in rectangular and square copper
and copper alloy tube.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Significance and Use
2.1 The rectangular or square copper alloy tube covered by this test method may be used in applications in which control of
twist is important to proper fit in final assembly and to minimize rework to bring the tube into compliance. It is recognized that
the amount of twist, in degrees, per increment of length can change as a result of the weight of the product and its length during
measurement.
2.2 This test method provides a procedure for measuring the twist in square and rectangular copper and copper alloy tubes as
a measure of the deviation from straightness.
2.3 This test method allows the purchaser and supplier or manufacturer to inspect square and rectangular copper and copper
alloy tube with a standard technique that provides acceptable twist in delivered tubes.
3. Apparatus
3.1 Horizontal Reference Plane (see Fig. 1 and Fig. 2) of sufficient length to support the tube specimen and a clamping device
to hold one end of the specimen against the reference plane.
3.2 Transparent Plastic Protractor Segment engraved with angle lines as shown in Fig. 3.
3.3 Parallel Face Blocks.
4. Procedure
4.1 Placethetubespecimenlengthwiseonthereferenceplane.Wheneverthespecimenhasnoticeableedgewisecurvature,place
the specimen so that a side having convex curvature is in contact with the reference plane. Further placement requirements are as
follows:
4.1.1 For rectangular tube, place a major outer dimension side (width side) against the reference plane, as shown in Fig. 1.
4.1.2 For square tube, having curvature along all edges, place the specimen so that the side with the least convex curvature is
against the reference plane.
4.2 Clamp one end of the specimen so that the tube surface, adjacent to that end and facing the reference plane, w
...
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