Electronics Forum | Sun Mar 18 23:01:11 EDT 2007 | diesel_1t
Hi there, I want help on the following issue. Where I work, we place a component QFP 256 terminals (20 mil pitch)from hitachi (renesas), we use a MPM UP-3000 screen printer, IP-III placement machine and Vitronics 8 zones reflow Oven. lead plating
Electronics Forum | Sat Mar 24 07:07:52 EDT 2007 | stefi
Hi, Thanks for the reply, The fiducial which posed problems is a 1 mm diameter gold plated circle fiducial. The problem with this is that the vision system sees it darker than the surrounding area. The surrounding area is all copper covered with th
Electronics Forum | Fri Mar 23 23:26:40 EDT 2007 | mika
Hi, We are facing a complete new package type for us in our prototype production. RoHS LGA 36 Land Grid Array with 36 so called pads instead of bumps underneath. It is totatlly flat. This component is only 6.5 x 3.5 x 1.6 mm and we recieved them in a
Electronics Forum | Wed Apr 04 14:29:16 EDT 2007 | rgduval
Anyone have experience wave soldering rigid flex assemblies? I've just picked up a new job from a customer; it's a rebuild for the company, but new to me. The customer had previously taken their business elsewhere due to delamination problems with
Electronics Forum | Fri Apr 13 10:13:30 EDT 2007 | Bob R.
We had a crisis with one BGA causing huge yield losses due to this defect. Nothing we could do with the profile got rid of it. Changing paste didn't get rid of it. It was the BGA warping in reflow, caused the corners to lift up when the solder was
Electronics Forum | Mon Apr 23 11:49:46 EDT 2007 | ck_the_flip
Wow, you're using the Surface Mount Adhesive for mechanical vibration? I've never heard of SMT adhesive being used for things other than holding the components in place before wave solder. Does it work for mechanical purposes? Glue/Wave is a proce
Electronics Forum | Thu May 17 19:21:39 EDT 2007 | diesel_1t
We are currently using Oven Rider (ECD) to "verify" just the conduct of the peak temperature; we define which product is the higher runner for this line and then with the settings for this product (already profiled with thermal couples attached to th
Electronics Forum | Thu May 24 17:37:25 EDT 2007 | jmelson
I did one batch of low-density (0805 and standard SO chips) with excellent results. I then spent some time figuring out how to calibrate the mechanical alignment station (most of the calibration offsets on this machine were either zero or several mm
Electronics Forum | Thu Jun 07 14:17:55 EDT 2007 | mfgengr
Thank you ChrisW. I agree completely. The decision to idle the temperature or turn the wave off is primarily a function of machine utilization. Period. The utilization % break even point for idle vs. turning the heat off is calculated by comparing th
Electronics Forum | Fri May 18 13:50:38 EDT 2007 | realchunks
Hi Grant, Replacing a wave witha spot solder? You must have very few comonents to solder or all day to solder them. Why are thinking of doing this? Well, I have looked at just about every selective machine out there. What it all boils down to is
