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#hypotrochoid

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myrmepropagandist<p>Used the laser cutter to make a holder for my class set of spirographs — for the lessons I like to do my students need to know how many teeth the gears have. They write a program that produces the same curve using turtle. (with older students we do the trig, which I just call “magic circle functions” for the grade fives)</p><p>This will make it all go much smoother! <br>This is 8 sets packed into one box! <br><a href="https://sauropods.win/tags/math" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>math</span></a> <a href="https://sauropods.win/tags/mathEducation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mathEducation</span></a> <a href="https://sauropods.win/tags/teaching" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>teaching</span></a> <a href="https://sauropods.win/tags/spirograph" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>spirograph</span></a> <a href="https://sauropods.win/tags/mathematics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mathematics</span></a> <a href="https://sauropods.win/tags/k12" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>k12</span></a> <a href="https://sauropods.win/tags/hypotrochoid" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hypotrochoid</span></a> <a href="https://sauropods.win/tags/trigonometry" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>trigonometry</span></a></p>
IT News<p>Op Amp Contest: Generate Spirograph Shapes Using Only Op Amps and Math - If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out ... - <a href="https://hackaday.com/2023/06/05/op-amp-contest-generate-spirograph-shapes-using-only-op-amps-and-math/" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2023/06/05/op-amp</span><span class="invisible">-contest-generate-spirograph-shapes-using-only-op-amps-and-math/</span></a> <a href="https://schleuss.online/tags/hypotrochoid" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hypotrochoid</span></a> <a href="https://schleuss.online/tags/epitrochoid" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>epitrochoid</span></a> <a href="https://schleuss.online/tags/spirograph" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>spirograph</span></a> <a href="https://schleuss.online/tags/toyhacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>toyhacks</span></a> <a href="https://schleuss.online/tags/mcp6004" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mcp6004</span></a> <a href="https://schleuss.online/tags/opamps" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamps</span></a> <a href="https://schleuss.online/tags/art" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>art</span></a></p>
Stewart Russell<p>The Hoot-Nanny (later called "Magic Designer") was a children's drawing toy that drew six-lobed patterns like the one shown below.</p><p>I've uploaded a simple CC-BY-SA simulation in Python here:<br><a href="https://gist.github.com/scruss/529a8ad86ea4906cd7db999b285574d0" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">gist.github.com/scruss/529a8ad</span><span class="invisible">86ea4906cd7db999b285574d0</span></a></p><p>It generates HP-GL and is hard-coded (currently) to one pattern. It doesn't model any of the fixed circle-drawing points present in the real thing.</p><p>Have fun!</p><p><a href="https://xoxo.zone/tags/plotter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>plotter</span></a> <a href="https://xoxo.zone/tags/geometry" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>geometry</span></a> <a href="https://xoxo.zone/tags/hypotrochoid" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hypotrochoid</span></a></p>
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