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IBM Selectric Typewriter & its digital to analogue converter

engineerguy4 HN recommenders · recommended in 5 months, 2016–2025
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explainer · general · evergreen · 2016–2025 on HN

Bill Hammack of engineerguy uses slow motion video to show how the IBM Selectric typewriter works. He focuses on its fully mechanical digital-to-analog converter, which turns key presses into rotation of the type ball.

HN commenters recommend it whenever the Selectric comes up, as a short, excellent explanation of its internals.

8 comments from Hacker News

@voxadam2023-04 · in “DIY IBM Selectric type balls give ’60s typewriters new life (and Comic Sans)”

The Selectric is a fascinating machine. I highly recommend watching "IBM Selectric Typewriter & its digital to analogue converter"[0] by The Engineer Guy. [0] ▶ this video

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@voxadam2025-09 · in “Comic Sans typeball designed to work with the IBM Selectric typewriters”

Bill Hammack (engineerguy) has an excellent video on the IBM Selectric titled IBM Selectric Typewriter & its digital to analogue converter .[1] [1] ▶ this video

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@golem142023-06 · in “How to make your own Selectric Typeballs”

To deepen the wonder, I'd be interested to see the longevity per material (PLA/Nylon/metal/...). I'd expect a lot of trial and error to deal with shrinkage and the probably high precision needed by the Selectric. But this is a great repository, thanks a lot! P.S. excellent short video by Bill Hammack on the Selectric internals: ▶ this video

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@djmips2023-03 · in “Mechanical aircraft weight and balance computer using whippletrees”

You might enjoy these. IBM Selectric Typewriter & its digital to analogue converter ▶ this video The Whiffletree: A mechanical digital-to-analog converter link

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@dghughes2016-06 · in “Xerox Alto Restoration Part 2: Firing up the monitor [video]”

You may enjoy Bill Hammack's video "IBM Selectric Typewriter & its digital to analogue converter" ▶ this video

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