Hi Kandasamy, Let me add a little to Jens comments. He is right about the difficulty in piercing FR4. The 0.8mm size is technically possible, but you need to use a "step punch" ie a 3.2mm reducing to 0.8 for the last 20mm or so. This is not really feasable in practice for the following reasons; the stripping force needed for FR4 is very close to the piercing pressure. Most mechanical presses cannot cope with "positive mechanical" stripping and typically you will need something like a multi nitrogen gassed cylinder stripper box fitted above the die set. It is very easy to pull the bevelled heads off the piercing punches! The punches should be HSS grade tool steel with annealed heads. I cant remember the names of the manufacturers, but they were all German. The initial "edge" goes off the tools very quickly with FR4, and then tends to hold in a slightly "blunt" stage. Punch/die clearance is critical as is the back relief in the die plate. Sorry but is was too long ago to remember the exact detail, however the punch manufacturers will be able to provide that data. Lastly, the hole quality will be terrible and you will get a pile of fine glass dust from the piercings. My advice - use a different material or drill!! Good luck, Wes Smith At 08:49 24/01/98 +0800, you wrote: >>Hello ! > >Hello! > >>Can any one help us to provide the following informations regarding FR4 >>laminates. > >Let's see..... > >>1. Is single sided 1.6mm thick 35 micron copper FR4 laminate available? >>Who manufacture this type? > >Absolutely no problem. Even in India! Contact either 'PCS (in Pune)' or >'Sandur Laminates' in Bangalore. I have both company details in the office >(I'm home now). Low cost/grade FR4 35/0 is available in Delhi. > >>2. FR4 can be punch able? Both holes (diameter 0.8 mm to 5 mm) and outer >>profile. > >FR4 is basically outline punchable. 0.80mm holes can NOT be punched. You >need also a very good punch tool maintainance. FR4 is a glass material and >glass is harder then steel. > >>3. If so, what type of tool is required? Who is the supplier of such tool? > >Sorry, this one I donno. > >>With regards and advance thanks, >> >>Kandasamy Chandrabose > >Happy CHinese New Year! > >Jens Behrens > >The PCB Laminate FAQ: http://www.felsweb.com/lam_faq.htm > ========================================== > Fels Ltd. URL HTTP://www.felsweb.com > GPO Box 8721 Tel.: +(852) 2423-1812 > Hong Kong Fax.: +(852) 2423-1899 > [log in to unmask] > ========================================== > >################################################################ >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 the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >################################################################ > > > ################################################################ 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 the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################