The solder-paste tag has no wiki summary.
3
votes
5answers
327 views
Why not reflow a PCB before placing parts?
A standard reflow method for low-volume assembly is:
Method A
Apply solder paste (using stencil or syringe)
Hand-place parts (using vacuum pickup pen or tweezers)
Oven reflow
-
But what happens ...
10
votes
1answer
417 views
Solder Mask and Cream in Eagle
I've got this part specification for the Paste Mask excerpted from the datasheet:
There's a lot of lingo in this short paragraph that I would like to better understand conceptually. Specifically I ...
6
votes
2answers
789 views
Solder does not stick to tip of soldering iron?
Basic question here, but it's driving me insane!
The solder does not seem to stick to the tip of my soldering iron. After the iron heats up, the tip appears black (sometimes on all sides and ...
5
votes
3answers
203 views
An idea for well-aligned component placement during PCB assembly
(Note: This question is in particular for low-volume self/manual assembly, i.e., without automatic pick and place machine).
Generally, stencils are used for well-aligned application of solder paste ...
5
votes
1answer
250 views
Soldering 0.5mm pitch ICs using stencil and reflow oven
I'm new to SMD soldering, and tried to assemble a couple of boards, using a reflow oven.
I 'm using a stencil (Kapton - mylar) and so far it worked fine except for the LQFP48 devices (pitch 0.5mm). In ...
4
votes
3answers
709 views
Questions on mass-production soldering
Wave soldering
I am trying to understand how wave soldering works. Unfortunately the Wikipedia article has has left me unsure about the process:
Is the entire board with its components ...
1
vote
1answer
124 views
Mylar Paste Stencils - Paste Mask File Conversion
I want to cut some cheap mylar stencils from mylar for quickly assembling some fine pitch SMT designs. I have access to a laser cutter for this purpose. The laser cutter accepts various file types... ...
3
votes
1answer
131 views
Component clearance for stencils and solder paste
I've never used stencils before, but now I'm going to have to (BGAs, lots of 0402 caps and resistors, etc).
How close together can the paste holes for say adjacent 0402 caps be for a stencil to work ...
3
votes
2answers
487 views
DIY Fluxes with ethanol-propanol-x-nol
Got inrested in DIY fluxes by reply here.
Can you substitute rosin-core wire with DIY flux and non-rosin-core-wire?
How and where to actually use DIY fluxes if you have rosin-core wire?
Which % of ...
6
votes
5answers
529 views
SMD solder now or later?
I'm soldering up some boards with smd parts, using a hot plate to reflow, and I'm (inevitably) realizing that I got some of the wrong parts. Now, is it better to leave the boards with smd components ...
