I just did a WEB search for "tombstoning", and this link came up, which might help: http://www.loctite.com/pdf/SMT_Anti-Tomstone_Article_Reprint.pdf
---Phil LYM IN> Dear All, LYM IN> I always set the polygon connect to pads directly, and it always work fine. LYM IN> But now, we found there are components stand after reflow, some contain LYM IN> pads connect to polygon, some not. I wonder if this is caused by the polygon LYM IN> connet style or any other reason. So my question is: LYM IN> 1, what are the key points to cause components stand after reflow? LYM IN> 2, When will components-stand always occur during reflow process? Preheat or LYM IN> cool. LYM IN> 3, How to slove this problem? LYM IN> I am looking forward to your constructive suggestions, any input would be LYM IN> great appreciated! LYM IN> Best Regards, LYM IN> Luo. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
