At 11:22 PM +0100 9/20/06, Tony Duell wrote:
Well done!. One comment, I would seriously
recomend putting some kind of
strain-relief on the wires at the edge connector. What I normally do is
screw a couple of tapped spacers to the connector feed, then screw a bit
of small angle brass (L cross section) to the other side of those, and
then fit cable clips to that as appropriate. Otherwise you will go mad
continually resoldering thr wires. Don't ask how I found that out :-)
I need to do something with all that, as I mentioned in one message,
this is the one part of the construction I don't like. Right now the
only way to unplug it is to use a pair of needle-nose pliers.
My problem is a decided lack of hardware on hand. You don't even
I stocked up on M2, M2.5, M3 and M4 nuts and bolts (of various lengths).
That covers must homebrewing applications. If you prefer the UNC threads,
they'll do too :-). I wouldn't even think of ordering less than 100 of
each part, for the common stuff (like M3 nuts), I tend to buy 1000.
I am perhaps lucky in that I have a reasonable mechanical workshop too.
If I need a special spacer, I make it from brass rod. A lathe makes it
easy to get it to the right length, to drill and tap the centre hole,
etc. I know this is not an option for everyone, though.
want to know what I had to do to come up with the
hardware to fasten
the 25-pin connector to the case!
The worse one is the HPIB (IEEE488) connector. The jackposts for that are
M3.5 thread. And nobody in the UK would sell me a couple. The end result
was that I bought a set of M3.5 taps and made them from stainless steel rod.
My first guess was some kind of tape cartidge box
(the translucent
plastic and the way it opens gave it away). I see others have correctly
said it was a TK50-like box. Well, I viewed the pictures in an local
internet cafe, and the box looks rectuangular (as opposed to square).
Either something is distorting the picture (does it look square to anyone
else?) or you've hit the well known perspective problem that affects
everyone who takes close-ups without a technical camera.
On my Mac and on my laptop (WinXP), they appear to be square. The
Oh, probaby a 'feature' of the LCD monitors in the internet cafe, then.
On those it looked to have about the same aspect ratio as an audio
compact cassette case.
pictures were taken with a Nikon D70 and 105mm Macro
lens, though I
did a pretty poor job on the depth of field. Maybe I should try with
That's one advantage of a technical camera. If you get the flim plane,
the plane of the less (yes, that's an approximation for a real lens) and
the plane of the subject all passing through one point [1] you get sharp
focus throughout the image plane. I am not going to attempt to spell the
name of the guy who named this principle, though.
[1] That point may be at infinity, that is the 3 planes can be parallel,
which is the case for most 'normal' cameras.
my "antique" Sony Mactiva <sp?>,
it's the 10x Optical zoom one that
Oh my carmeras are such antiques that they don't even know what a floppy
is :-).
writes to a floppy. I bought it nearly 10 years ago,
largely to be
able to photograph computer equipment, and because it would work well
Odd. That's why I bought an MPP Monorail...
-tony