AS ISO ASTM 52921:2020 Standard terminology for additive manufacturing一Coordinate systems and test methodologies

AS ISO ASTM 52921:2020 Standard terminology for additive manufacturing一Coordinate systems and test methodologies.
initial build orientation, u—of a part, is the orientation of the part as first placed in the build volume and becomes the reference for any further part reorienlation (see A 1 .6).
DIscuss)N—Thc initial build orientation is most easily communicated via 31) computer models (which can he interrogated for part position and orientation relative to the build volume origin). Where practical, the initial build orientation may he designated as the part orietuauon in the 3D computer model. Without electronic transIr of computer mxlels, it should be documented with image(s) of the part(s) within the build volume and their orientation relative to the build volume origin (see Al .6 and A 1.7).
bounding box is aligned parallel to the X, Y, and Z axes of the build volume origin (as shown in A 1 .5(c)). its orientation may be described by listing which axis is parallel to the longest overall dimension of the hounding box first, followed by the axis which is parallel to the second longest overall dimension of the hounding box second, followed by the axis which is parallel to the third longest overall dimension of the hounding box.
IJIscussIoN— For example, a specimen which is placed so that its longest dimension is parallel to the Z axis, the second longest dimension is parallel to the X ax is, and its shortest overall dimension is parallel to the Y axis shall he deli iied as having a ZXY orientation (see A I .8 and A I . 10 for examples).
D1s’tIssIoN—Where symmetry allows unambiguous designation of orientation by listing fewer than three axes (in descending order of length). orthogonal orientation notation can he further abbreviated (see AL.9 and Al.l0).
DiscussioN—Some combinations of part symmetry in an orthogonal initial build orientation fully define only one possible orientation and therefore no image is required to communicate the initial build orientation. This is the case for parts like the dog bone specimen (D638 or Iso 527) in Al.10, which are bilaterally symmetrical (see Al.9) through its geometric center in the XY, Xl YZ planes and have no rotational symmetry. AS ISO ASTM 52921 pdf download.