For those interested, I received my vintage PCB stock yesterday and did some test etching to see how it came out. Also did some comparison photos: http://bradhodge.ca/blog/?p=1060
Pretty crazy – the boards even have the Techniques logos on them. Different color from my Mark-8 original boards, but nonetheless, cool to think I could make new Mark-8 boards with original Techniques logos on them!
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Sunday, June 11, 2017 9:40 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] Found vintage PCB stock
One tip with epoxy (and most other glues), use cheap, clear packing tape as a mask for keeping glue off. Practically nothing sticks to it. I use packing tape as a release coating on glue frames when I do laminations. Works great. I would also roughen the surface of the boards to insure good grip. If you have some scrap extra, glue that together in a dry run just to be sure it works well.
Lastly, bubbles in the epoxy may create a bad look. If you can find a vacuum chamber, degas the epoxy first. Then try to put the boards together from one edge to squeeze out any bubbles between. The vacuum can also be used to compress the board during the curing in a vacuum bag and maybe coax out bubbles trapped in between the boards.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Sunday, June 11, 2017 2:32 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Found vintage PCB stock
On Sun, 11 Jun 2017 11:02:25 -0700, you wrote:
>I bought a whack of these:I do that for double sided boards. You may want to use long setting
>
>
>
>http://www.ebay.com/itm/351681662704?_trksid=p2057872.m2749.l2648
><http://www.ebay.com/itm/351681662704?_trksid=p2057872.m2749.l2648&ssPageNam
>e=STRK%3AMEBIDX%3AIT> &ssPageName=STRK%3AMEBIDX%3AIT
>
>
>
>I don't know how accurate he is on age but if they're even just pre mid-80s
>that should, I hope, yield the right look. I do a lot of vintage/retro
>recreations and I just ∗hate∗ the look of modern PCB stock. Totally ruins
>it. If these are actual vintage early-70s I'll be able to make
>reproductions that visually are difficult to discern from original.
>
>
>
>Only negative is at 0.03 they are half the usual thickness. I had a crazy
>thought that maybe I could glue/laminate two together? Is that
>possible/sane?
>
(half hour or hour) epoxy depending on how fast you are. Make sure
your registration holes are EXACTLY aligned since this is critical. If
you use pins to hold them together, then use fat pins that don't
wobble. You may want to make a fixture for each board from some cheap
wood. Cover the board with masking tape to prevent epoxy
fingerprints.
Once pinned together and with the glue on, then tape the boards so
they cannot move.
Let sit for 24 hours between two cheap floor tiles to keep them flat.
Harvey
>
>
>Brad
>
>
![](\"https://ec.yimg.com/ec?url=https%3A%2F%2Fipmcdn.avast.com%2Fimages%2Ficons%2Ficon-envelope-tick-green-avg-v1.png&t=1572567821&sig=eUZcNfGsW_0c._Kj5ltMpQ--~E\")