Praveen, Good question. From my viewpoint it depends on the targeted results of AOI. In a past life we did post paste as well as post reflow. Of course the theory of getting information earlier in the process being the best course of action can only be advisory when you ask either one or the other. With what you have asked here, I would prefer the post reflow. My thinking is that you seem to already be OK with the paste process, and if you have the placement process pretty well nailed down the the latter of the two locations would be a better bet because it allows you to validate a good total process. Whereas if it is before reflow you don't get a good 'picture' of what is happening in reflow. Now if you put it post reflow and find a lot of problems, then you could always move it to pre reflow to help determine the real cause. Of course the opposite is true also in that if you place it pre reflow and don't see problems but there seems to be problems later in the process, then post reflow might help a bit. Probably the best action is to decide on one place and see what you get. Personally, if the paste printing, placement and any other process prior to reflow seem to be in check, I would prefer to look at the finished product. Good luck. Richard Hamilton At 12:18 AM 8/31/01 +0000, you wrote: >Hi everyone, >I just wanted to know where would it be preferable to postion an AOI >equipment on a production line. I have known of people who prefer to use it >before reflow and some who have suggested after reflow. >What would the implications be if this equipment is placed prior to and >after reflow? >Also, if one had to evaluate an AOI equipment (not solder paste measuring >equipments), then what factors would one have to consider to gage the >capability of this equipment? >Thanks >Praveen > > > >__________ --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------