On Nov 12, 2016, at 2:24 PM, Paul Koning <paulkon...@comcast.net> wrote:

> There are lots of paper manufacturers and lots of grades and thickness of 
> paper.  The thickness we're talking about is one that shows up in a couple I 
> looked at.  So it wouldn't surprise me at all if suitable paper could be had. 
>  The matter of cutting it to the correct shape is a different issue, 
> admittedly.  

It may not be all that difficult. Perhaps the right method here is a die-cut, a 
common method for doing custom cuts of paper — often far more complicated than 
punch cards. The basic idea is that you build a form up with steel rules that 
define the edges you want cut. These rules essentially act as a blade. Then you 
mount this on a press, and run through a stack of paper as if you’re printing, 
but in fact you’re just cutting.

Here’s a basic overview:

        https://www.youtube.com/watch?v=o1NKLPYS0Vo

A few years back, while photographing letterpress printers (see 
http://johnlabovitz.com/projects/letterpress), I met a fellow (Rob Barnes) in 
Denver who specializes in die-cutting. Like most die-cut operators, he uses 
mid-20th century Heidelberg letterpress printing presses. I have no idea if 
he’s interested in a retro-punch card project, but it might be worth contacting 
him.

        http://www.vintagepressworks.com

Frankly, I think the harder task is to find a good stock of appropriate paper.

Best,
—John

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