High level work-bench

[Gareth Magennis]

http://tinypic.com/r/m8mp9s/8
http://tinypic.com/r/2hdntyp/8

Good photos. Are those tin whiskers between the IC leads? Offhand,
it looks more like steel wool residue.

I'm at home now and don't have any pictures handy. The best I can do
is this series of photos of an RJ45 plug, taken with the cheap USB
microscope:
<http://802.11junk.com/jeffl/pics/RJ45/index.html>



I'd be very interested to see what a good quality USB microscope or similar
can achieve, compared with a DSLR with various fudging going on.
Perhaps a DDR RAM stick is the obvious control photo.

I notice your photo's are heavy with JPEG artifacts. I'm guessing this
would be a result of taking the photo, rather than what you might see on a
live monitor?


I don't know if they are tin whiskers or not, I just thought it was fluff,
but on inspection it probably isn't.
This stick has been lying around unprotected for years, don't even know if
it works!


Cheers,


Gareth.

 

[Jeff Liebermann]

On Sun, 30 Mar 2014 21:34:48 +0100, "Gareth Magennis"
<gareth.magennis@ntlworld.com> wrote:

I'd be very interested to see what a good quality USB microscope or similar
can achieve, compared with a DSLR with various fudging going on.
Perhaps a DDR RAM stick is the obvious control photo.

Not enough detail in a DDR RAM stick. Enlarged currency is the
ultimate test with the bonus of the flat bill not having a depth of
field problem. I'll see what I can do, but probably not for a few
days. Too many projects right now.

I notice your photo's are heavy with JPEG artifacts. I'm guessing this
would be a result of taking the photo, rather than what you might see on a
live monitor?

The artifacts are from compressing and enhancing the photo with
Irfanview. I rarely post photos in the original resolution. For this
test, I'll crop the photo, but not reduce it in size.

I don't know if they are tin whiskers or not, I just thought it was fluff,
but on inspection it probably isn't.
This stick has been lying around unprotected for years, don't even know if
it works!

Looks more like steel wool or file shavings. Whatever it is, it looks
conductive and should not be under the chip or between the leads.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Gareth Magennis]

"Jeff Liebermann" wrote in message
newsohhj95s0185i51aashk5h83gm220dov9d@4ax.com...

On Sun, 30 Mar 2014 21:34:48 +0100, "Gareth Magennis"
<gareth.magennis@ntlworld.com> wrote:

I'd be very interested to see what a good quality USB microscope or similar
can achieve, compared with a DSLR with various fudging going on.
Perhaps a DDR RAM stick is the obvious control photo.

Not enough detail in a DDR RAM stick. Enlarged currency is the
ultimate test with the bonus of the flat bill not having a depth of
field problem. I'll see what I can do, but probably not for a few
days. Too many projects right now.






Finally got my hands on the Raynox lenses.

Here is the Raynox150 on the end of the Canon zoom at 250mm:
http://tinypic.com/r/x45ir7/8

and software zoomed in:
http://tinypic.com/r/15xwxs0/8



Here is the Raynox250 on the same lens:
http://tinypic.com/r/5v23o2/8

and software zoomed in:
http://tinypic.com/r/ofprol/8


The Raynox150 puts the camera 20cm from the subject, the 250 is 12cm.




Gareth.



Cheers,



Gareth.

 

[Spehro Pefhany]

On Thu, 27 Mar 2014 09:42:26 +0000, the renowned N_Cook
<diverse@tcp.co.uk> wrote:

I was watching a bit of film of a master goldsmith/jeweller at work. His
workbench was at chest height, because mainly close-up work.
He then had forearm rests, fixed to the bench, for doing the precision
manipulation work.
Does anyone here who regularly repairs/reworks SM boards have a similar
setup? Could of course be a standard bench height but cut-down stool.

If money is no object, you can get electrically adjustable workbenches
(eg. the Lista Align series) that will let you go back and forth at
the touch of a button.

Cut down stool wouldn't be quite the same- your legs would be folded
up.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com