The standard ASME Y14.31-2008, Undimensioned Drawings provides the requirements for undimensioned drawings that graphically define objects with true geometry views and predominantly without dimensions. This standard also provides recommendations for drawing and noting bend lines and bend information.
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Q7: CLB is centerline of bend.
Q8: Sheet metal typically thicker than 6 mm (0.25 in)
Q9: BUP 90° X R. 250 means bend
Q10: The term sheet metal refers to metal
Q11: Sheet metal thickness generally ranges between .03
Q13: OML is over the middle line of
Q14: The term bent or bend refers to
Q15: Precision sheet metal prints require close tolerances
Q16: Bend allowance is the amount of extra
Q17: Extremely thin sheet metal thicknesses are referred
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