Dear Members, I need information/help for the following. AA.Presently we buy masslam.How to ensure drilling accuracy with reference to inner layers.We do only four layer boards now. Any simple equipments to see drill hole accuracy with reference to innerlayers.Currently I etch one panel after drilling to check the drill hole concntrcity w.r.t IL BB.Any simplle equipment to measure the remaining thicknees after V-cut(v groove) CC.We need to introduce lot tracability.Any suggestion in this regard.Any ipc /mil spec detailing possible method? Thanks in advance for the information R.Srinivasan Engineering Mrg Likom PCB SDN BHD Malacca Malaysia Ph:+60 6 3345666 ext3030 Fax:+60 6 3345033 e-mail:[log in to unmask] http://www.likom.com.my