Crib Semi-Finished CRIB safety allowance - This variable contains the amount, in mm, which will be added to the minimum calculated blanksize to allow for edging tolerance; this allowance is used both when selecting the blank, and of course in crib diameter. Range from 0 to 10 mm. Applies only to semi-finished blanks.
Finished CRIB safety allowance - This variable contains the amount, in mm, which will be added to the minimum calculated blanksize to allow for edging tolerance; this allowance is used both when selecting the blank, and of course in crib diameter. Range from 0 to 10 mm. Applies only to finished blanks.
Blank seg drop - This is the segment drop of the lens blank, the vertical distance from the geometric center of the blank and the top of the segment.
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