Electronics Forum | Tue Oct 19 19:44:19 EDT 2010 | laen
I'm looking to mix up a batch of purple solder mask. Has anyone found a good ratio of red and blue that produces a pleasing purple? 50/50 produces a pretty ugly grape color. Is there a standard ratio most fabs use?
Electronics Forum | Thu Oct 21 23:20:05 EDT 2010 | camtechpcb
According to the Trichromatism.Half red and half blue will get purple.But the trichromatism only apply to color light. The red and blue soder mask are coloring material.Both of them absorb light.You mixed them up,so you lose blue and red,and get grap
Electronics Forum | Wed Oct 20 11:15:23 EDT 2010 | jax
Circuit and Local Fiducials are all the same. The difference is the amount of "Stretch and Skew" that is accounted for. Local fiducials apply "Stretch and Skew" to a single placement or area of the circuit, depending on Equipment used. Circuit fiduci
Electronics Forum | Wed Oct 20 11:39:01 EDT 2010 | mikesewell
On our Fuji NXT and AIM machines I never program local fids...we place down to 16 mil fine pitch and BGA, uBGA, multirow QFNs with no placement issues. Most boards are panelized in an array and we have corner fids added to the rails. Regards, Mi
Electronics Forum | Thu Oct 21 10:48:05 EDT 2010 | wrongway
depends on the machine the old amistar machines I used local fids they were needed we got new universal machines now it does'nt seem to need them we place down to 16 mil pitch and small bga with no problems at all using global fids
Electronics Forum | Thu Oct 21 05:42:15 EDT 2010 | jacki
Dear All Does anyone know about the low melting point solder paste which should be Copper Base? Usually the Copper base solder has 227'C of melting point.
Electronics Forum | Sun Oct 31 11:02:51 EDT 2010 | Mark
http://www.shanelo.co.za/List%20of%20articles/Indium%20Alloy%20list.pdf
Electronics Forum | Mon Nov 01 04:40:29 EDT 2010 | jacki
Hi Mark thanks and useful. However, I couldn't find the Copper base solder paste which melting point is lower than 210'C.
Electronics Forum | Mon Nov 01 11:43:45 EDT 2010 | patrickbruneel
Jacki, Lead-free Cu based alloys with melting point below 210C don’t exist.
Electronics Forum | Fri Oct 22 11:18:59 EDT 2010 | davef
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