Em 3/3/2010 23:47, Marechiare escreveu:
> Isaac Marino Bavaresco escreveu:
>   =

>> Why not? The solder creates a meniscus that connect
>> the pad surface to the pin surface, otherwise  it would
>> be impossible to solder boards without plated holes.
>>     =

> Did not you notice that pins and wires were bent?
>   =


Perhaps I missed something in the original post. Are you saying that the
pins and wires are bent on the alluded board or in all boards in general?

I have a friend that bends the tip of all the pins and jumpers on the
bottom side of the boards, but he does this because his products are
used in motorcycles that have too much vibration.

We have lots of products in single-sided boards and we never bend the
tip of the pins on the bottom. The solder creates a cone-like (more
likely a "volcano-like") meniscus that have its base anchored to the
PCB's pad and the pin or wire protrudes straight from the tip of the
"volcano", very well soldered also.

I would say that in a vehicle this technique may indeed lead to failure
due to vibration, but for stationary equipment it is less than a concern.


Somebody said in another post that some components are impossible to
solder on the components side. That's true, but not for machined IC
sockets. Machined sockets have several mm of exposed pins on the sides.

I have made some prototypes with this technique myself, and what I did
was to add a "via" near the pin that cannot be soldered on the top side
and solder a short wire across it.

A friend of mine also used this technique already and what he did was to
solder a very thin strand of wire across every hole that needed to be
connected on both sides, and then inserted the components and soldered
them only on the bottom side. The strands of wire are so thin that they
don't take virtually any cross-sectional area of the hole.


Best regards,

Isaac
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