Electronics Forum | Fri Mar 16 02:20:09 EDT 2007 | Wayne
Have to check with paste manufacturer. paste on the stencil should be at least 12 hours paste on the board before mounting should be at least 4 hours.
Electronics Forum | Fri Mar 16 07:10:53 EDT 2007 | davef
1 Print paste on a bare board or laminate. 2 Place components in the paste. 3 Gently invert and support the board above a table. 4 At one hour intervals, record the number of components that have fallen from the board.
Electronics Forum | Fri Mar 16 07:16:35 EDT 2007 | chrissieneale
Thanks for that - i now have a starting point! Always the hardest bit. I'll report what i find! Chrissie
Electronics Forum | Mon Mar 19 06:47:36 EDT 2007 | chrissieneale
After a little investigation (with my eyes closed and fingers crossed) how about up to 24 hours?! ?! I think i might have found one of the root causes of my oooooodles of rework.
Electronics Forum | Mon Mar 19 14:24:30 EDT 2007 | jdengler
I have been involved with the evaluation of close to a dozen pastes from 5 manufactures. I never found one that would rest on a board for anything close to 24 hrs and still have acceptable performance. Jerry
Electronics Forum | Tue Mar 20 03:48:06 EDT 2007 | chrissieneale
Already figured i would do that if it came to it - still planning my approach, which will hopefully eliminate this whole 'waiting after pasting' nonsense anyway. Suggestions very welcome though, as it may well get to the test and see stage! Cheers
Electronics Forum | Thu Oct 06 10:57:16 EDT 2011 | emeto
Denmark, it looks that you really have a problem. You just don't tell us what is it.
Electronics Forum | Thu Oct 27 10:07:06 EDT 2011 | jillatchoice
I have a good source for Juki and Philips feeders. Please let me know what PN you need and I'll check my stock. Thanks, Jill Choice Equipment Inc. jillatchoice@aol.com
Electronics Forum | Fri Jul 21 07:01:33 EDT 2017 | emeto
Reflow oven profile and X-ray should give you all the answers that you need. Thermocouples should be attached to this ground plane.
Electronics Forum | Mon Jul 24 09:29:14 EDT 2017 | emeto
Precisely! Your reflow profile is what proves temperature on the pad is right. X-ray is your visual representation of the result - customers love to see that you are correct.
