Lazy Susan / Flat Ball Bearing - with 6mm air soft pellet

prusaprinters

<h3>Design:</h3><p>This part is meant to act as a flat ball bearing (AKA Lazy Susan) in the joint between the body and the turret on a small automated/RC tank. The 2 main requirements were sturdiness and room to let pass some cables between the 2 planes, as batteries, controller and components were distributed in different parts of the tank.</p><p>I'm including the STEP files so you can tweak it if necessary.&nbsp;</p><h4>Mounting:</h4><ol><li>Fill the <strong>Bottom Ring</strong> groove with the pellets, around <strong>26 </strong>or 27 (I had better result with 26) <strong>6mm Air Soft Pellets</strong>. I used regular plastic ones.&nbsp;</li><li>Insert the <strong>6000zz</strong> ball bearing in the <strong>Top Ring</strong></li><li>Just <strong>sandwich the pellets</strong> with the two rings, and lock them with the nut (check <strong>Variants </strong>sections for more details on this). &nbsp;<strong>Tighten </strong>the nut until the top ring doesn't move vertically (along the shaft axis), but it can<strong> spin freely</strong> without using too much force.</li><li>The <strong>Top Ring </strong>has 6 4mm holes in hexagonal arrangement, at <strong>18.75mm</strong> from the center. I used this <a href="https://www.amazon.se/ruthex-g%C3%A4ngad-insats-m%C3%A4ssingsinsatser-plastdetaljer/dp/B08BCRZZS3?th=1"><strong>Heat Threaded Brass Inserts</strong></a> for M3 screws to easily mount/unmount things on the Top Ring. Alternative was disassembling the 2 rings to deal with the nuts inside.&nbsp;</li></ol><h4>Variants:</h4><ul><li><strong>M3</strong>: It has a solid shaft and an<strong> M3x14 screw and nut </strong>to lock the two rings together.</li><li><strong>M10</strong>: <strong>The Shaft</strong> is threaded to hold an <strong>M10 nut</strong>, and it <strong>is hollow</strong> to allow the passage of cables between the planes.&nbsp;</li></ul><h4>BOM:</h4><ul><li>1x 6000zz Ball Bearing (10mm ID, 26mm OD, 8mm Width).</li><li>26~27x 6mm Air Soft Pellets&nbsp;</li><li>1x M3x14 screw (Variant 1)</li><li>1x M3 Nut (Variant 1)</li><li>1x M10 Nut (Variant 2)</li></ul><p>if you go with the heat inserts:</p><ul><li>6x Heat Threaded Brass Inserts (<strong>~4.6mm</strong> outer diameter).</li></ul><h4>Video:</h4><p><a href="https://www.youtube.com/shorts/scPFr9LUt2I">Here's a short video with a spin test of the part.</a></p><p>&nbsp;</p><p>Enjoy!</p>