20 Aug
2007
20 Aug
'07
5:37 p.m.
Vincent Slyngstad wrote:
I have one of these, and the wires with the plugs are a problem. Mine
came to me with only a few of these left, and I haven't been able to
replace them. For those who've never seen one (but care), there are
eyelets/rivets which are sized appropriately for a mini-banana plug,
set into the lab box to form the connection points. Then, a kit of
various lengths of wire is provided. The wires end on both ends with
something similar to the male pins from a large AMP connector or the
like. The thing is, they have an unusual tapered shape, rather than
a simple cylinder, which allows them to wedge into the eyelets nicely.
The pins appear to be brass, and the eyelets look like they might be gold
plated(?).
I (and probably others who own one) would love to get some more of the
wires, or at least a source for the tapered pins to make new wires.
If the tapered pins were available, I suspect brass eyelets could be
used for an inexpensive (and almost authentic) plug/connector scheme.
(Mini-banana plug hardware seems to be the antithesis of inexpensive!)
Vince
--------------
I assume you are talking about the DEC logic trainer? If you talking of the
CDC trainer, I have a couple of old chasses loaded with wires and buggies
that I use for repair. Even have some NOS wires and buggies.
Billy
20 Aug
20 Aug
5:50 p.m.
From: "Billy Pettit"
Vincent Slyngstad wrote:
Yes, I meant the DEC trainers that Ethan referred to.
Vince
I (and probably others who own one) would love to
get some more of the
wires, or at least a source for the tapered pins to make new wires.
I assume you are talking about the DEC logic trainer? If you talking of
the
CDC trainer, I have a couple of old chasses loaded with wires and buggies
that I use for repair. Even have some NOS wires and buggies. 
6:31 p.m.
From: "Billy Pettit"
How big (approximately) are these tapered pins, length, diamter at the
'big end', diameter at the 'small end'. Are they just plain tapered pins
(i.e. no spring contacts on the sides or anything).
I am wondering how hard it would be to make some from brass rod....
-tony
Vincent Slyngstad wrote:
Yes, I meant the DEC trainers that Ethan referred to. I (and probably others who own one) would love to
get some more of the
wires, or at least a source for the tapered pins to make new wires.
I assume you are talking about the DEC logic trainer? If you talking of
the
CDC trainer, I have a couple of old chasses loaded with wires and buggies
that I use for repair. Even have some NOS wires and buggies.
7:55 p.m.
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
Vincent Slyngstad wrote:
Unfortunately, I lack the tools to measure that accurately. What I
can say, is that the Molex 02-09-2118 male pins fit nicely into the
holes but don't "wedge" properly. (The flanges are also too steep
to grip well.) That implies to me that their diameter of .093"/2.36mm
is about right for the narrow tip. The wider base near the wire
crimp measures something like .106" to .113" or so. It's hard to
get accurate, as it isn't very uniform, and the jig I am using doesn't
hold the pin "straight".
It wouldn't surprise me to discover the holes are about .100", but
I can't directly measure those at all. But it is approximately
.09"-.10"(hole)-.11". The pins are also hollow, so there may be
a phenomenon where they compress slightly as you push them in,
contributing to the nice "wedged in" feel.
Vince
Yes, I meant the DEC trainers that Ethan referred
to.
How big (approximately) are these tapered pins, length, diamter at the
'big end', diameter at the 'small end'. Are they just plain tapered pins
(i.e. no spring contacts on the sides or anything).
I am wondering how hard it would be to make some from brass rod.... 
9:01 a.m.
From: "Alexandre Souza":
Mike Stein pointed to the simple expedient of using drill bits to size
the hole, and that result came in at 3/32", which is quite close to
the 1/10" that I had come up with from measuring the pins.
So, I'm sticking with 1/10" for inside diameter of the hole, with the
pins tapered from about .09" to about .11" over a distance of about
3/8". The total length of the pin, including the part that crimps,
is 5/8".
Anyone know of a pin like that? I understand that Tyco/AMP has/had
a "93 series" of tapered pins, but I can't find technical drawings
for them, nor a current supplier.
Tony had suggested milling some, and that gave me the idea that one
could mill a tool instead, to deform the standard .093" Molex pins
to the correct shape. (Basically something you'd jam into the back
to retaper the molded cylinder.) Might be worth a shot.
Vince
Unfortunately,
I lack the tools to measure that accurately. What I
Maybe some photos? 
4:15 p.m.
Vincent Slyngstad wrote:
Tony had suggested milling some, and that gave me the
idea that one
could mill a tool instead, to deform the standard .093" Molex pins to
the correct shape. (Basically something you'd jam into the back to
retaper the molded cylinder.) Might be worth a shot.
I don't have time to check this out but try seeing if the people who
make brass fasteners for CRYSTAL-RADIOS can make the fasteners of the
correct shape. I link around here.
http://www.schmarder.com/radios/index.htm
Vince
T.F.N.
6214
days inactive
6215
days old
6 comments
5 participants
participants (5)
-
alexandre-listas＠e-secure.com.br -
ard＠p850ug1.demon.co.uk -
bfranchuk＠jetnet.ab.ca -
Billy.Pettit＠wdc.com -
vrs＠msn.com