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Back marks, Cross centres and Pitch

Back marks, Cross centres and Pitch. Aims and objectives To be able to identify where the back mark measurement is taken from To understand the relationship between the back mark length and the flange length of the section.

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Back marks, Cross centres and Pitch

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  1. Back marks, Cross centres and Pitch Aims and objectives To be able to identify where the back mark measurement is taken from To understand the relationship between the back mark length and the flange length of the section. To be able to identify where the cross centres measurement is taken from. To identify the practical application of the PCD measurement and how it is used in conjunction with the line of chord calculation To identify a linear pitch.

  2. Backmark for Equal leg RSA

  3. Backmarks for Unequal leg RSA

  4. Backmarks for Unequal leg RSA (cont)

  5. S2+S3+S3 = S4

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