9 May
2021
9 May
'21
11:09 p.m.
Folks,
Does anyone have a design for printing card handles for QBUS / UNIBUS
cards? It seems a natural application.
Some grepping of the list logs, a brief plonk through the gadawful
thingiverse search, and various googling have produced no existing
designs.
Thanks,
De
9 May
9 May
11:18 p.m.
Does anyone have a design for printing card handles
for QBUS / UNIBUS
cards? It seems a natural application.
I suppose I should be more specific: the plastic kind that are just
handles, also seen on flip chip cards, -8 stuff, whatever. Not
extractor levers or s-box stuff.
TIA,
De
11:25 p.m.
On May 9, 2021, at 11:18 PM, Dennis Boone via cctalk
<cctalk at classiccmp.org> wrote:
Does anyone have a design for printing card handles for QBUS / UNIBUS
cards? It seems a natural application.
There is an stl file on this page (4th down on the right):
https://so-much-stuff.com/pdp8/cad/3d.php
I had a few of these printed for a Unibone I put together, and they came out well.
cheers,
--FritzM.
10 May
10 May
12:20 a.m.
vince has some onhis site https://so-much-stuff.com/pdp8/cad/3d.php
On Mon, May 10, 2021 at 1:09 AM Dennis Boone via cctalk <
cctalk at classiccmp.org> wrote:
Folks,
Does anyone have a design for printing card handles for QBUS / UNIBUS
cards? It seems a natural application.
Some grepping of the list logs, a brief plonk through the gadawful
thingiverse search, and various googling have produced no existing
designs.
Thanks,
De
5:48 a.m.
Just don't expect it to be as tough as the original.
On Mon, May 10, 2021 at 3:20 PM Adrian Stoness via cctalk <
cctalk at classiccmp.org> wrote:
vince has some onhis site
https://so-much-stuff.com/pdp8/cad/3d.php
On Mon, May 10, 2021 at 1:09 AM Dennis Boone via cctalk <
cctalk at classiccmp.org> wrote:
Folks,
Does anyone have a design for printing card handles for QBUS / UNIBUS
cards? It seems a natural application.
Some grepping of the list logs, a brief plonk through the gadawful
thingiverse search, and various googling have produced no existing
designs.
Thanks,
De
6:08 a.m.
That would depend on which material/printer you use.
paul
On May 10, 2021, at 8:48 AM, Tom Hunter via cctalk
<cctalk at classiccmp.org> wrote:
Just don't expect it to be as tough as the original.
On Mon, May 10, 2021 at 3:20 PM Adrian Stoness via cctalk <
cctalk at classiccmp.org> wrote:
> vince has some onhis site https://so-much-stuff.com/pdp8/cad/3d.php
>
> On Mon, May 10, 2021 at 1:09 AM Dennis Boone via cctalk <
> cctalk at classiccmp.org> wrote:
>
>> Folks,
>>
>> Does anyone have a design for printing card handles for QBUS / UNIBUS
>> cards? It seems a natural application.
>>
>> Some grepping of the list logs, a brief plonk through the gadawful
>> thingiverse search, and various googling have produced no existing
>> designs.
>>
>> Thanks,
>>
>> De
>>
>
7:14 a.m.
On May 10, 2021, at 8:48 AM, Tom Hunter via cctalk
<cctalk at classiccmp.org> wrote:
Just don't expect it to be as tough as the original.
I would assume it would be trivial to do an injection-moulded run of
these handles, if 3D print schematics are available. They were
definitely well-copied in the hey-day of the PDP-11, with most 3rd-party
cards using identical handles, minus DEC branding.
I think the real question would be if doing a production run would be
worth it. To make it economical, you'd need to do a run of a few
thousand, but i can't imagine the market demand would be there for so
many handles. The other question is, why replicate the originals?
Surely, there's got to be a drop-in replacement that would be stronger,
even if it's a length of bent steel rod with the ends flattened and
drilled through. (I'm sure i've seen someone do this somewhere, but i
may have just dreamed it)
Josh Rice
10:15 a.m.
On 5/10/2021 9:25 AM, Fritz Mueller via cctalk wrote:
Resin casting will work, but it's messy, etc. I haven't had any trouble
with the toughness of 3D printed handles. Honestly, I often attach them
with a pair of small zip-ties instead of rivets, and they are still
plenty strong. The usual caveats about 3D printing apply -- just don't
print it so that the layers will be torn apart when you pull on it!
Maybe you PDP-11 guys are more used to hex cards, or something? I did
have some PCB made where the card fingers tended to bind, but that's
best addressed with some careful filing and a tweak of the CAD files for
the next run :-). (The CAD files on so-much-stuff have long been
tweaked for a good fit to the connector blocks.)
Vince
On May 10, 2021, at 7:14 AM, Joshua Rice via
cctalk <cctalk at classiccmp.org> wrote:
I would assume it would be trivial to do an injection-moulded run of these handles...
They might also be ideal for silicone mold / resin cast, for smaller/home production
runs? 
10:59 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vincent Slyngstad via
cctalk
Sent: Monday, May 10, 2021 1:16 PM
To: cctalk at classiccmp.org
Subject: Re: QBUS/UNIBUS card handles
On 5/10/2021 9:25 AM, Fritz Mueller via cctalk wrote:
Resin casting will work, but it's messy, etc. I haven't had any trouble
with the toughness of 3D printed handles. Honestly, I often attach them
with a pair of small zip-ties instead of rivets, and they are still
plenty strong. The usual caveats about 3D printing apply -- just don't
print it so that the layers will be torn apart when you pull on it!
Douglas Electronics used to stock these as Miscellaneous items alongside their DEC
compatible PCBs.
http://www.douglas.com/index.php/off-the-shelf-solutions/bread-boards/de-11…
However I don't see them listed anymore; nor am I able to find them using the search
function .
Possibly they simply sold out of their existing stock, and that was that.
You could inquire on the off chance that they just aren't listing any remainders.
paul
On May 10, 2021, at 7:14 AM, Joshua Rice via
cctalk <cctalk at classiccmp.org> wrote:
I would assume it would be trivial to do an injection-moulded run of these handles...
They might also be ideal for silicone mold / resin cast, for smaller/home production
runs? 
11:14 a.m.
I don?t know about the spacing of the holes, but BIVAR has one and two-hole card pull
handles.
https://www.bivar.com/product/cp-pcb-handles/
Datasheet: http://www.bivar.com/parts_content/Datasheets/CP-1and2.pdf
--
Ron Pool
10:02 a.m.
On 5/9/21 11:09 PM, Dennis Boone via cctalk wrote:
Folks,
Does anyone have a design for printing card handles for QBUS / UNIBUS
cards?
how about
https://www.essentracomponents.com/en-us/p/pcb-card-pullers
10:21 a.m.
Two thoughts -
* Not sure the mounting hole spacing is correct; the one from Vince's
site looks to be about 2" between centers; the Essentra says 1.25".
It's entirely possible I don't know diddly about DEC card handles
though.
* Minimum order 500, and 1000 before a price break.
De
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-
aek＠bitsavers.org -
amp1ron＠gmail.com -
ccth6600＠gmail.com -
drb＠msu.edu -
fritzm＠fritzm.org -
paulkoning＠comcast.net -
pbirkel＠gmail.com -
rice43＠btinternet.com -
tdk.knight＠gmail.com -
vincent.slyngstad＠gmail.com