Dear Leow, If you can gain access to a Dynatex International Scriber/Breaker equipped with the "non-contact option it should do a nice job for you. This will allow you to subdice the chip without touching the topside. Glenn B. Guilford 212 Whitetail Lane Clarks Summit, PA 18411-9095 + 570.587.0940 gguilford@worldnet.att.net