It has been my experience that cracking in "harder" material can be solved with an undercut drill with slower than normal infeeds. There are also some "alternative" drill designs available on the market that work quite well in this situation. If you would like contact me off of the TechNet at [log in to unmask] I wish you luck. Mark R. Ford, Application Engineer - Megatool On Mon, 8 Jun 1998 15:42:01 +0100 James A Larson <[log in to unmask]> writes: >Has anybody experienced Radial Cracking as viewed from a >horizontal section or Fishscale cracking as viewed from a >vertical section using Cyanate Ester Resin. This resin system >is used to fill a 2 oz. copper plane layer in a 8 and 10 layer board. > >If so what parameters have you compensated for to help >minimize this situation? > >We've modified press parameters and drill parameters with >minimal success. > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV >1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with >following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC web site (http://jefry.ipc.org/forum.htm) for >additional information. >For technical support contact Hugo Scaramuzza at [log in to unmask] or >847-509-9700 ext.312 >################################################################ > > _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################