Electronics Forum | Sun Feb 24 14:52:15 EST 2013 | davef
Aw, spare me!!! You guys have too much money to spend. Go to Walmart, KMart, where eva. Buy a electric fry pan griddle thing. Plug that suka in. Turn up the heat. Cook some boards, components [grilled cheese sammy??]. Get to work doing what eva. Liv
Electronics Forum | Tue Feb 25 06:06:11 EST 2020 | hexton
I am currently weighing up my options for resistors that will be fitted to a fully assembled PCB (PTH&SMT). Do I omit the stencil apertures leaving exposed pads (ENIG) so they can be hand soldered with fresh solder. Considering shelf life for soldera
Electronics Forum | Wed Feb 26 13:26:24 EST 2020 | rgduval
I'd agree with getting a stencil fully cut, and taping the pads you don't want paste on. But, I'd also check with the people that will be doing the hand soldering to see what they prefer. Some people prefer soldering on bare pads, some prefer solde
Electronics Forum | Tue Feb 25 18:36:03 EST 2020 | emeto
Flat surface is the number one choice for fresh part soldering. We did not discuss details about resistor size and location, but to keep them flat I will suggest no apertures on the stencil.
Electronics Forum | Wed Feb 26 07:07:19 EST 2020 | dontfeedphils
"One caveat with ENIG is sometimes washing with hot DI water can effect solderability later on." How so? (Genuinely curious)
Electronics Forum | Tue Feb 25 10:30:02 EST 2020 | richardcargill
If you get the stencil made with all apertures included then you can blank some off with sellotape. Saves you buying 2 stencils should you require them machine fitted in the future
Electronics Forum | Tue Feb 25 11:56:33 EST 2020 | slthomas
I think I'd opt for a stencil with everything already cut and then tape it if that didn't screw up your stencil gasketing. Then you just have to define the process for adding the optional parts and you can decide to use those apertures or not.
Electronics Forum | Tue Feb 25 06:18:55 EST 2020 | spoiltforchoice
First question would be why are you hand soldering these resistors? I would expect ENIG to be perfectly solderable after reflow and quite some time later. If you leave the apertures out of the stencil and then decide to automate fitting them, you'l
Electronics Forum | Tue Feb 25 06:34:50 EST 2020 | hexton
The reason the resistors are fitted at a later stage is to complete the circuit but the values that will be fitted depends on the frequency range desired. My preference would be to leave them free of solder, limiting the options for the process used
Electronics Forum | Thu Feb 27 02:55:53 EST 2020 | hexton
I want to avoid peoples preferences as they will differ and will not be a deciding factor. A heat gun will introduce risk to surrounding PTH components and having to add protection for those, will limit any gain in productivity. There is no question
