Flat Spinning Top

prusaprinters

<p>Spinning top with weight mainly pushed to the edge, rather than the centre as is more normal, so gyroscopic effects give this a very stable spin. The top is spoked to further reduce central weight.</p> <h3> Instructions</h3> <p>Spin by holding the edges as you would spin a plate or bottle, or put your slender fingers in the gaps between the spokes and twist. I intend to design a proper handle to clip into the top of it, but it works okay as it is.</p> <p>I have managed reasonable spins on a tablecloth as well as a carpet with a rounded pivot -- it seems to work a bit better than other spinning tops on softer surfaces.</p> <p><em>v2</em> adds a little handle (or alternate pivot point), which should slot into the bottom/top of the spinning top.</p> <p><em>v3</em> is again a single print with an internal grip. It's a little bit too small for adult hands (so print at 1.5x if you want thumb/finger space), but should be fine for little kids.</p> <p><em>v4</em> has a tube finger grip with a wider space for thick fingers. It also includes rotated ring supports that should act as air fins to stabilise the top (and give it a bit of lift). There are two STL models, one to lift on clockwise turns (_RH), and one to lift on anti-clockwise turns (_LH).</p> <p><em>v5</em> is inner-ring free, has a thicker outer ring, and exploits a 45 degree angle upwards from the centre to reduce spinning top height. A rotate-extrude in CGAL wouldn't work for me, so I've compromised with a spider-like 8-way spoking.</p> <p><em>v6</em> tries to do away with the finger grip entirely, using finger rings instead. I ended up welding a spare handle onto the top, because I made the rings too small (the STL file has been updated to account for this).</p> <p><em>v7</em> also tries to do away with the finger grip entirely, but uses a bar instead of rings.</p> <p><em>v8</em> returns to the finger grip, after a discovery on use that the finger grip provides much more turning power. I have now worked out how to do a properly rotated polygon. The ring is also modified to be a slice of a hollow sphere that is centred on the pivot point.</p> <p><em>v9</em> is back to basics, but includes a split print with a M6 screw thread</p> <p><em>v10</em> changes to an M10 screw thread, and leaves the axle customisations to the user. See <a href="https://www.thingiverse.com/thing:1250982">M10 Toolkit</a> for things to put inside the axle hole. It works well with threaded rod and an end cap.</p> <p><em>v11</em> uses a non-spoked bottom with periodic holes in it.</p> <h3> 2 Minute Spin</h3> <p class="detail-caption">M10-Threaded spinning top with 60mm flat threaded rod and end cap. </p> <p class="detail-video"> <figure class="media"> <oembed url="https://www.youtube.com/embed/7ThT-oBV91I"></oembed> </figure> </p> <p class="detail-caption">Spinning Top Stopped by a Cat</p> Category: Mechanical Toys