Lou. I used to have the solder pot tested on a quarterly basis, and the only change I had to make was to add extra tin once. All the other contaminants remained stable. Steve. "Tempea, Ioan" wrote: > Hi Lou, > > we are doing it on a quarterly basis for as long as I can remember and I > didn't notice any significant difference between each set of results. All > the contaminants are very low each time. And we passed all the ISO audits. > > Frankly, I think that twice a year is not a bad idea. > > Regards, > Ioan > > > -----Original Message----- > > From: Lou Hart [SMTP:[log in to unmask]] > > Sent: Wednesday, July 11, 2001 9:54 AM > > To: [log in to unmask] > > Subject: [TN] Wave solder pot analysis > > > > TechNetters, I'd appreciate comments on contaminant analysis of a wave > > solder pot. We had been sending a sample out for analysis (type "C" I > > think it is, by the mil spec) once per month. Now the solder supplier is > > telling me that once every six months is more than enough. I've been > > taking the contaminant data and plotting Q charts (for short-run SPC the > > modern way, as I've been mentioning in this forum) with the monthly data. > > What has been your practice and recommendation? > > > > At the moment, it is hard for me to feel comfortable with a twice-yearly > > analysis of what seems to me to be an important material in our > > manufacturing process. Lou Hart > > > > -------------------------------------------------------------------------- > > ------- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > > To unsubscribe, send a message to [log in to unmask] with following text in > > the BODY (NOT the subject field): SIGNOFF Technet > > To temporarily halt delivery of Technet send the following message: SET > > Technet NOMAIL > > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > > E-mail Archives > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > > additional > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > > ext.5315 > > -------------------------------------------------------------------------- > > ------- > > --------------------------------------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------