Electronics Forum | Mon Sep 30 04:27:40 EDT 2013 | grahamcooper22
I am not sure what the IPC spec is suggesting....K type thermocouples are normally specified upto 1250 C, of course there is a tolerance in their accuracy and this probably degrades after hundreds of uses through a reflow oven, but normally the accur
Electronics Forum | Thu Oct 17 21:13:35 EDT 2013 | hegemon
But where does it go, that it needs to be refreshed or replenished on the stencil? Does that "just like wax" product wind up in my solder joints, no matter how small the percentage, and would it then qualify as a contaminant? I heard there are some (
Electronics Forum | Mon Oct 28 08:27:53 EDT 2013 | emeto
There are many profilers(physical devices) on the market. Most of them have software that makes predictions based on information about the paste, oven model...., but I wouldn't trust the predictor as on your boards you will have different parameters
Electronics Forum | Thu Oct 31 12:33:14 EDT 2013 | pbarton
You should have no difficulty with QFN or QFP parts when using non-RoHS solder. The QFP's are most likely to have tin plated leads and the metallisation on the QFN lands the same, or ENIG. Check the component part datasheets to verify the plating an
Electronics Forum | Thu Oct 31 12:37:37 EDT 2013 | pbarton
You should have no difficulty with QFN or QFP parts when using non-RoHS solder. The QFP's are most likely to have tin plated leads and the metallisation on the QFN lands the same, or ENIG. Check the component part datasheets to verify the plating an
Electronics Forum | Thu Oct 31 17:45:44 EDT 2013 | hegemon
I have no knowledge of the Vitrox AOI, but in general, I would say that decide which company can provide you with the best support given your location. Local reps, Field Service Rep locations and availability should be investigated, as you will need
Electronics Forum | Wed Nov 13 16:48:19 EST 2013 | spoiltforchoice
I would expect any half decent machine to place 0603 parts slap bang on target to the typical defined accuracy for such parts on most machines of perhaps ~60 microns or better. Self correction during reflow is IMHO much less pronounced with lead-free
Electronics Forum | Fri Jan 24 08:14:24 EST 2014 | davem
m_imtiaz, Over the last 15 years or so I've found that using the stencil foil thickness +2mils/-0mils has worked very well. For example, if you have a 5mil stencil thickness your upper control limit would be 7mils and your lower control limit would
Electronics Forum | Tue Jan 21 13:43:12 EST 2014 | rgduval
Jorge, Your description of the process sounds about right. A fixture to hold the flex cable taut (and in a repeatable location) that allows you to paste/place/reflow is essential. As for notes: Be hyper aware of moisture/humidity in regards to
Electronics Forum | Fri Feb 14 14:09:06 EST 2014 | marcpeo
In general the chains don't need to be heated to 400 deg C for cleaning. In other words, most of the fluxes and constituents in the paste don't collect on the chain and gum it up. Bottom line: the heat treatment is not needed for 95% of the users.
