Electronics Forum | Thu Aug 10 10:00:40 EDT 2006 | slthomas
Temp. and humidity levels are dependant upon your chemical (paste and adhesive) specifications. Ballpark I'd say 70�F and 40%-45% RH are good targets, as our paste spec. says optimal ranges are 70-77� and 30-70 RH. As far as air quality, if you bui
Electronics Forum | Mon Jun 25 19:36:36 EDT 2007 | bga_kid
If you calculate CFM using the numbers you have provided you are pulling 1396CFM out of the oven. I am not sure what Hellers spec is but I know a Speedline OmniExcel Air machine should be set at 300CFM. I do know for a fact that to much exhaust can s
Electronics Forum | Sun Nov 24 10:12:44 EST 2002 | kcorrin
Thanks for your response Dave. I did look at the bare boards after wave solder and they seem to solder fine in that process. I do not see any soldermask bleed on bare boards. Regarding "thin" plating...I have had issues in the past when the board sup
Electronics Forum | Sun Sep 28 17:14:53 EDT 2008 | ronsou
small pads like 0402 tend to get hot quite > easily. looks like excessive heat is your problem > here. pads are wetted, component leads are not. > this means solder paste flux on top layer was > exhausted before entering in reflow. your profile
Electronics Forum | Tue Sep 02 15:29:36 EDT 2008 | bvdl
small pads like 0402 tend to get hot quite easily. looks like excessive heat is your problem here. pads are wetted, component leads are not. this means solder paste flux on top layer was exhausted before entering in reflow. your profile is the 'in-be
Electronics Forum | Mon May 24 06:04:09 EDT 2004 | johnwnz
Nitro, I msuggest you get your oven manual out and start reading!! it depends on yoru machine, the point of injection, how many zzones it's designed to cover (some only inject for reflow) what your inward flow rate is, what yoru exhaust rate is and
Electronics Forum | Wed Oct 07 13:15:06 EDT 2015 | markhoch
You can most certainly use the same reflow oven for both leaded and lead-free pastes. Obviously your thermal profiles will be different, as the lead-free paste should have a higher reflow temp. As long as your oven has adequate exhaust and flux manag
Electronics Forum | Wed Jun 22 13:00:12 EDT 2005 | slthomas
"His opinion was that you could never achieve 500cfm, even with a jet engine attached, as the outlet on the oven was too small..." I had that experience with a washer that blew steam out of the entrance. He said we'd collapse the pipe before we ever
Electronics Forum | Wed Feb 17 17:15:17 EST 2010 | jax
Did you just change anything on the Exhaust?... even if the change was adding something else to the main exhaust trunk, if you don't have each item seperated. Although CFM changes should not effect the Blower Speeds or the Zone stablizing time, since
Electronics Forum | Thu Feb 07 12:18:41 EST 2008 | tonyamenson
Does anyone use or have any simple wave/reflow oven exhaust monitors with a visual check (LED). I was going to design something crude resembling a fan with an electric winding (electric motor of sorts)and a load (resistor maybe with a transistor if
