Problem with SM caps

[Archimedes' Lever]

My assembly and QC people are superb, and I pay them roughly 4 times
what most board stuffers pay, plus full benefits. And I wouldn't hire
you to wash their dishes, even if we didn't have a dishwasher.

Notice that I said GEAR, idiot. You likely do not even know what
dispensing tip sizes are available for your gear.

You are likely out of touch.

Throw more money at it, Johnny. It will fix itself that way.
Bwuahahahahah!

Board stuffing... Bwuahahahahah! I do not stuff boards, Johnny. Do
you?

 

[Capt. Cave Man]

Hi Everyone,
Ok, mystery solved. These things aren't caps, they are little EMI
filters! They popped up when I did my search of the Digikey database
when I was ordering, and in my error, I saw "filter, cap" and thought
that meant a filter cap, not a filter that contains a cap. Of course
DK is doing the right thing, and refunding my purchase and shipping my
replacements free, but they are also going into the web guys, and
making sure that a search for capacitors doesn't bring up filters!

Sorry to drive ya'll as crazy as I have been...

Charlie

Everyone affected will send you their hair replacement bills.

 

[Archimedes' Lever]

We have a soldering iron that looks like a pair of tweezers. Both
ends get hot and one just plucks the parts off. I don't like using it
to solder parts back on because its tips are crap.


I just lost some pads because I had to solder a resistor to the board
as a probe point. The scope probe got bumped and the whole mess came
off. I spent an hour soldering wires and gluing down PTH resistors to
get the board working again. :-(

I learned a long time ago that strain relief is important, even in a
quick test scenario.

 

[krw]

I learned a long time ago that strain relief is important, even in a
quick test scenario.

Nothing to tie it to. A 0603 pad was the best solution, though I now
use a hunk of 28GA wire and a dab of crazy glue. It gets ugly but the
board fix was worse since there was nothing left on the back of the
board.

 

[Archimedes' Lever]

Solder wick never gets all
the solder from under thepads, so you've got to use force to finally
break the part away. If you're lucky, the pad isn't damaged and you
just leave a bit of

Wrong. What it does is allow the reflow and removal operation you
previously described to be done with less heat, and less time on the
terminations, an essential operational step. No stress on the pads,
thermal or other wise in such a method. Yours works as well, it just
isn't that good for the part. UNLESS you get it off the solder tip
immediately. Or replace it and pitch the removed part.

 

[Archimedes' Lever]

Pool bores me. I'd rather ski,

Pool was the game of Kings, so I can understand you not being able to
do it or grasp it well enough to like it.

I can slalom and barefoot water ski, and I always hit the black
diamonds on the ski slopes. Plenty of reasons to say that snow sucks
more than indoor sports though.

 

[Archimedes' Lever]

coefficient
of friction 0.03,

Wrong. You think that is the figure for a human standing upright? More
like the figure for the skis, which essentially is meaningless in real
world use. You, however, certainly have a higher coefficient than cars
do, so your figure is off by at least an order of magnitude, and I would
say far more.

In other words... Jeez, what a lame claim.

 

[Archimedes' Lever]

Beats
knocking balls around a flat table with a stick.

It figures that that is all you think it is. Likely a bit more due to
the fact that your just plain are not all that dexterous. You probably
wouldn't even know the value of a co-linear stroke. You probably will
make or immediately think of some lame twit remark about the use of the
term 'stroke'. That pretty much sums up your mind set after seeing
stupid remarks like that.

 

[Archimedes' Lever]

If you solder a sm part vertically, one pad down and one sticking up,
it's incredibly fragile. I do that sometimes making copperclad
breadboards, and usually break them. Disc ceramics or axial resistors
are better for stuff like this.

John

A 'tombstoned' part (yes, Johnny that is the right term) is fine. The
thing one must do is set up a strain relief such that ANY part mounted on
the assembly that you are attaching to receives NO physical strain
whatsoever. That means a strain relief downstream to the connection.
Pretty much common sense.

Tombstoned parts are actually acceptable assembly processes in the IPC
standard that most currently follow. Just not for class 3.

 

[Archimedes' Lever]

Of course I don't. That's not my job. I do know that we have three
automatic solder stencil machines, and that we seldom dispense solder
with "tips."

Show me where ANY of us were talking about solder, you stupid twit.
This thread was about staking small parts.

Try to keep up, Johnny.

 

[Archimedes' Lever]

Engineers keep
different hours from production people; we're in late and stay late,

Pussy. Most engineers here get to work before 6:00 AM.

My evening hours are important to me. You get home, eat dinner, watch
the news, and crash, because unless you get to bed by nine so you can
have nine hours of pussy boy sleep, you can't get up in time to arrive to
work at pussy boy banker's hours.

I get to work by 6, get home by 3:30, and have all evening to myself.
That time is far more important to me than lying in bed all fucking
morning. I also do not crash until about 4 hours before I have to get up
again.

You put in half the work and claim full (fool) pay, and I put in twice
the work of the typical 'man' and likely get less than the Obama retard
wants to pay the folks he wants to spend millions of dollars of our tax
money to to re-sod the DC mall.

You can rest assured, however, that you are not as dumb as he is. That
ain't saying much though.

 

[Archimedes' Lever]

I admit that my production people are way
better at assembly and rework than I am, which is as it should be.
Everybody has their talents.

Yep. You can't shoot pool. Evryone has their talents. Yours just
number very few.

Had you embraced that in your youth, you might have more hand dexterity
skills now.

 

[Archimedes' Lever]

Nothing to tie it to. A 0603 pad was the best solution, though I now
use a hunk of 28GA wire and a dab of crazy glue. It gets ugly but the
board fix was worse since there was nothing left on the back of the
board.

Tack pack does work. The fine gauge wire helps if 'service loops' are
used as strain 'springs'. Similar to the way Shockley did it on the
first transistor.

I have used a twisted pair of fine hook up wire, twisted tightly enough
that they grapple each other well. Then I tie one to the service test
point, and the other to an SMD tantalum or other large form factor
anchoring pad.

 

[krw]

If you solder a sm part vertically, one pad down and one sticking up,
it's incredibly fragile. I do that sometimes making copperclad
breadboards, and usually break them. Disc ceramics or axial resistors
are better for stuff like this.

It was an axial resistor that provided the leverage to make a mess.
In this case I was trying to inject a test signal into the summing
node. All the probes got too heavy, the board moved, and...

 

[Spehro Pefhany]

One big tip works fine. The part comes off in a couple of seconds,
with no stress on the pads or on the part. Solder wick never gets all
the solder from under thepads, so you've got to use force to finally
break the part away. If you're lucky, the pad isn't damaged and you
just leave a bit of the end-cap plating on the board.

Silly.

John

A relatively big blob of Sn63Pb37 solder will heat both ends on a
small (0402 or 0603) SMT part, and the surface tension sucks the part
off the board so it disappears into the blob of solder, whereupon it
can be flicked off. Of course you don't re-use such parts, but they'd
probably be okay.

 

[Spehro Pefhany]

Don't be a jerk. Nobody likes jerks.

John

I like jerk chicken-- with "peas and rice" (actually beans and rice).

http://mamastime.files.wordpress.com/2008/04/riddim_chicken.jpg
http://mamastime.wordpress.com/2008/04/30/mmm/

I guess you could leave out the coriander.

 

[Rich Grise]

We have a soldering iron that looks like a pair of tweezers. Both
ends get hot and one just plucks the parts off. I don't like using it
to solder parts back on because its tips are crap.

I've achieved this effect by holding two small irons in one hand, a la
chopsticks.

Cheers!
Rich

 

[Rich Grise]

You and Sloman are playing the same pathetic game. This group is about
electronic design. Why either of you post here is a mystery.

It stimulates the trollfeeders. ;-)

Cheers!
Rich

 

[Spehro Pefhany]

I've achieved this effect by holding two small irons in one hand, a la
chopsticks.

Cheers!
Rich

Careful not to burn your mouth accidentally.

 

[James Arthur]

Careful not to burn your mouth accidentally.

Yep. Go easy on the hot sauce!