Electronics Forum | Mon Oct 12 22:35:55 EDT 1998 | Hank Hsiung
Hello, friends: Do you know where I can buy cheap double sided flexible circuits, especially adhesiveless system. Also, when I make double sided flexible circuit assembly, beside using temporary stiffener, any other method to do double sided as
Electronics Forum | Sat Oct 17 23:54:15 EDT 1998 | Kallol Chakraborty
the size of panel > is the free real-state) or greater, would help in selective stiffening of the panel itself for multiple placement for multiple assemblies hence achieving cost reduction. Hope it helps. If you need any info. for our company for t
Electronics Forum | Tue Jun 17 11:18:20 EDT 2003 | Claude_Couture
How are the 8 units distributed on the panel? 1 X 8, 2 X 4? Are there "V" groves scored in the panels to "break away" the units? Do you run on edge conveyor in the reflow oven? You need center support if you have 2X4 pattern with "V" grooves. Or us
Electronics Forum | Tue Apr 25 13:05:08 EDT 2006 | Hoss
TMC, Are you interested in this approach because you only have a flat belt conveyor and want to keep the components from being moved by the belt on the second pass? If so, you might try adding some stiffeners to the board edges to stand the board o
Electronics Forum | Thu Sep 07 07:41:06 EDT 2006 | Bubba
Check for coplaner leads if this just exists at reflow process, i.e. look at part before oven, turn on 3D at placement machine. If you see after wave solder, the wave could cause coplanarity issues on top as well if you are going slow enough to refl
Electronics Forum | Mon Aug 27 13:02:32 EDT 2012 | rway
We will look at the oven speed. We considered stiffeners but opted against that due to the risk of moving parts pre-reflow due to handling. 90 deg? I don't know. This may or may not help with the bowing. Considering there is little to no substra
Electronics Forum | Mon Jul 01 09:33:08 EDT 2019 | dbuschel
if you can't change the PCB materials or design at this point, you might be able to reduce it somewhat through the use of fixtures or edge stiffeners. Unless it is a particularly thick board, I don't think the reflow profile would be the issue. The t
Electronics Forum | Thu Jun 17 10:25:43 EDT 1999 | Brian Wycoff
| | We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centr
Electronics Forum | Thu May 07 21:25:56 EDT 1998 | D.Lange
| I am running a board that is .062" thick and has components that over hang the edge of the board by .090". I have bottom side smt components (chip caps and resistors only) and use the turbulent wave to help solder the components. The problem I am
Electronics Forum | Sat May 09 11:54:12 EDT 1998 | Bob Willis
All the comments that have been made a great but I do have to say that much of the problem comes back to the design engineers not designing for manufacture. Centre board supports would have sorted the problem without jigs. | | I am running a board t
