DEC Computer Lab for sale
mhs.stein at gmail.com
Mon May 31 12:24:43 CDT 2021
Sorry, these pins are smaller: .056" - .068'.
On Sun, May 30, 2021 at 6:02 PM Vincent Slyngstad <
vincent.slyngstad at gmail.com> wrote:
> On 5/30/2021 1:02 PM, Mike Stein wrote:
> > What's the length and the diameters at each end of the pin? I've got
> > some cables for Burroughs patch panels that might be useful.
> The pin diameter at the rounded tip is .093", a standard pin diameter.
> It flares to 0.102" or so, over about 0.34" of length. The overall pin
> length (including the insulation crimp/strain relief) is about 0.65".
> Also measured some patch cords (pin tip to pin tip):
> Brown is 2.75".
> Red is 4.75".
> Orange is 6.75".
> Yellow is 8.75".
> Green is 16.5".
> Subtract about an inch and a quarter for the length of the visible wire.
> There was also blue, though I don't have one to measure. My notes
> remind me that the blue looks about an inch or so longer than green,
> based on the cover photo of the manual. At that length it will
> comfortably reach across the device, whereas the green is just a little
> short for that.
> Found in my old notes:
> The DEC 12-03498 was a #41675 taper pin.
> Similar AMP taper pins:
> 42107 "88" series will fit.
> 42279 is similar, though obsolete.
> My old notes also suggest higher quantities for the patch cords; 100 of
> them all together:
> B 20
> R 30
> O 25
> Y 20
> G 10
> B 2
> > On Sun, May 30, 2021 at 3:40 PM Vincent Slyngstad via cctalk
> > <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> > On 5/30/2021 10:54 AM, Ethan Dicks wrote:
> > > On Sun, May 30, 2021 at 11:42 AM Vincent Slyngstad via cctalk
> > > <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> > >> https://so-much-stuff.com/pdp8/computerlab/computerlab.php
> > <https://so-much-stuff.com/pdp8/computerlab/computerlab.php>
> > >> The photos get a little bigger if you click them. Those bits of
> > stamped
> > >> brass or whatever they are made of were probably pennies each.
> > >
> > > I've thought about what it might take to manufacture a pair of
> > > rollers that could stamp those out but I haven't gotten very far
> > > it. Same idea for the backplane bus strip DEC used to sell on the
> > > roll.
> > >
> > > Depending on level of detail, either a small CNC or possibly a
> > > EDM could make the dies.
> > I thought about machining a ram to deform an existing modern pin (or
> > even just tubing) to create the taper.
> > I also tried to cast some out of solder, but they had bubbles and
> > were a
> > little too soft (tin-lead solder). Also, with a solder connection
> > really need a good strain relief. At some point it's too much work
> > what you're accomplishing (and still not very authentic).
> > Vince
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