I've heard that the general rule limiting blind vias is a 1:1 aspect ratio. You are at it with the 16 mil holes & 16 mil depth. It seems like you are doing the right things (i.e. vibration, etc.) so I'm not sure what else to suggest. MB _____________________________ Reply Separator _________________________________ Subject: Blind vias & fine lines Author: [log in to unmask] at SMTPLINK-HADCO Date: 2/12/97 10:07 PM Techneters, Can anyone help? I am having two problem areas: 1) Blind via holes 16 mil diameter 16 mil deep contacting with 4 inner layers. I cannot always plate copper into all holes. If I do copper plate them I cannot tin plate all the holes. I have vibrators on the cathode movement frame and a giant to clout the fight bars with a 2 pound hammer. Is there anything else I can do?!? 2) Circuits with 2 mil track and gaps. The finish required is electroless nickel/immersion gold. How can this be done without causing the tracks to short with nickel spikes? Thanks in advance, Roger Hammond *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************