Archive for December 20th, 2019

Homage Tektronix Circuit Computer: Ball-point Pens vs. Paper

Extra Fine Pilot V5 pens have a 0.5 mm ball, in contrast to the 1.0 mm ball in the cheap pens I’ve been using, so they should produce much finer lines.

Which turns out to be the case:

Tek Circuit Computer - pen and paper comparison
Tek Circuit Computer – pen and paper comparison

That’s a stack of three “Homage” Tek CC bottom decks under a Genuine Tektronix Circuit Computer.

The black scale at the top of the picture (and the bottom of the stack) came from a 1 mm cheap pen in the collet holder, the two green scales come from a 0.5 mm Pilot V5RT cartridge in its new holder, and the Original is (most likely) laser-printed back when that was a New Thing.

As always, paper makes a big difference in the results. The brownish paper is 110 pound card stock with a relatively coarse surface finish. The white paper is ordinary 22 pound general-purpose laser / inkjet printer paper.

The 1.0 mm pen (top) doesn’t much care what it’s writing on, producing results on the low side of OK: some light sections, no blobs. Perfectly serviceable, but not pretty.

1.0 mm ball pen
1.0 mm ball pen

The Pilot V5RT really likes better paper, as it bleeds out on the card stock whenever the CNC 3018XL so much as pauses at the end of a stroke. Using white paper slows, but doesn’t completely stop, the bleeding, making the blobs survivable.

0.5 mm ball Pilot V5RT pen
0.5 mm ball Pilot V5RT pen

I’ve been using card stock to get stiffer, more durable, and more easily manipulated decks, but the improved line quality on the white paper says I should laminate the decks in plastic, just like the original Tektronix design.

No surprise there!

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