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From: | "karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] [OT] Solder paste woes |
In-reply-to: | <66c88bcb-820c-9a1d-1698-d0b36f32e3f3@linetec.nl> |
References: | <66c88bcb-820c-9a1d-1698-d0b36f32e3f3 AT linetec DOT nl> |
Comments: | In-reply-to "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
message dated "Wed, 17 Aug 2022 13:15:47 +0200." | |
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Message-Id: | <20220817122152.B1A0B824695E@turkos.aspodata.se> |
Date: | Wed, 17 Aug 2022 14:21:52 +0200 (CEST) |
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Richard Rasker: ... > My main problem is that even after hundreds of PCB's, the result is > unpredictable. Only 2 out of every 10 PCB's have a good crisp result, > like this: http://www.linetec.nl/electronics/paste_crisp.jpg > > The other PCB's often look like this: > http://www.linetec.nl/electronics/paste_mess.jpg ... This is what I noted: . there are more lint strands in the "mess" one . on some paste lands there is evidence of it sticking to the stencil . on U2 the paste don't align with the cu-lands . on the D2 andD3 silk, at the hole, there is some surplus paste, same on U6 bottom left hole inside the courtyard silk same to the left around the "+" silk sign some on the hole below U6's left side . overall on the "mess" one, the alignment is bad So, has there been movements and perhaps better cleaning will help ? Also, if you store the paste in the refrigerator, it will get more fluid when it heats up, so perhaps a more thick paste that you will allow to heat up before use to lessen the differents between pcb's. Regards, /Karl Hammar
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