Charlene, Material is a large factor in the depth of scoring, as well as to the quality and ease of removal. I've seen from a .018" to a .031" remainder. The 031" would break, but not cleanly. Made for a stronger panel, but the .018 was easier and the product looked much better. The assembly also becomes a factor since some have the entire panel assembled, requiring a thicker V and some have the board scored so they may be removed then assembled. The depth and angle aren't as important as what is left. This may be a value that you use regardless of the thickness. As for combination, consider only the hardness for the thickness remaining. Consider making a matrix of you findings Type Fr-4 Fr-4 Panel assembled etc...... Thickness .020" .031" Sorry I can't be more specific, since it is application driven. Chris Robertson [log in to unmask] What depth, and angle do you spec on your panel drawings for scoring a board with a .062 thickness? Does it make a difference on the Board Material because we are using a combination of FR4 and RF35 for a 4 layer board. -Char ---------------------------------------------------------------------------- -- Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/