NEMA17 stepper motor Planetary GEARBOX 1:5 reduction

prusaprinters

<p>This <strong>planetary gearbox</strong> has been designed to reduce the <strong>backlash and hysteresis</strong> but at the same time to be <strong>easily printed and assembled.</strong></p><p>Three "planets" and the "sun" are contained inside a 60 teeth corona providing a total <strong>1:5 reduction.</strong></p><p>It has been proved that the 1:5 ratio <strong>has a very good balance between speed and accuracy</strong> when using the regular 1.8º/step NEMA17 motors.</p><figure class="image"><img src="https://www.jjrobots.com/wp-content/uploads/2020/05/Planetary-Gearbox-NEMA17-by-jjRobots.com_.jpg" alt=""></figure><p>The teeth of the gears have been modeled so they can be printed using a 0.4mm nozzle (no sharp edges)</p><p>Print the orientating the GEARs (SUN and PLANETs) so the narrow part is touching the heated bed. Doing that, the "elephant foot" effect due to an overheated bed will <strong>not deform the contact surface of the GEARs.</strong></p><p>Print the GEARED CASE with SUPPORT and oriented as shown in the image portfolio.</p><h3>...................................................</h3><h3>Elements to be printed:</h3><h3>..................................................</h3><p><strong>3x PLANETS</strong></p><p><strong>1x SUN</strong></p><p><strong>1x UPPER STRUCTURE</strong></p><p><strong>1x GEARED CASE</strong></p><p><strong>1x GEARBOX BASE</strong></p><p><strong>1x MOTOR-PLATFORM ADAPTER</strong></p><h3>...................................................</h3><h3>BOM (Bill of Materials)</h3><h3>...................................................</h3><p><strong>1x 6002RS Ball Bearing</strong></p><p><strong>4x 623ZZ Ball Bearing</strong></p><p><strong>7x M3 20mm bolt</strong></p><p><strong>4x M3 10mm bolt</strong></p><p><strong>3D printed parts</strong></p><p>&nbsp;</p><h3>...................................................</h3><h3>Comments:</h3><h3>...................................................</h3><p><strong>After many, many</strong> sets of 3D parts printed, we got to the conclusion that it is impossible to <strong>replicate</strong> the printing accuracy when using different brands of plastic filaments or 3D printers.</p><p>It will depend even on the nozzle <strong>diameter</strong> you are using or <strong>layer height</strong>. So, as we really wanted a very precise and backlash-free gearbox, we have designed two different sets of gears.</p><p>You will have to print both and select the best combination of <strong>SUN</strong> and <strong>PLANETS</strong>.</p><p>STL files:<br>You will find 2 sets of PLANETs and SUNs. Named as <strong>PLANET 3.15</strong> and <strong>PLANET REGULAR</strong>, the same goes for the SUN: <strong>SUN 3.15</strong> and <strong>SUN REGULAR</strong>.</p><p>You will have to print <strong>3 planets and one sun for a complete set of gears</strong>. But, as we really want to reduce any gap between the gears to zero, print 3x PLANET 3.15, 3x PLANET REGULAR + 1x SUN 3.15 and 1x SUN REGULAR.</p><p>Depending on the <strong>printing accuracy,</strong> you may need to <strong>combine</strong> the PLANETS of one SET with the SUN of the other.</p><p>If you are using a <strong>resin printer</strong> for the GEARs, select the&nbsp;<strong>PLANET 3.15</strong>&nbsp;and <strong>SUN 3.15</strong> STL FILES</p><p><strong>Stay tuned</strong> for updates and new designs: <a href="denied:Stay%20tuned%20for%20updates%20and%20new%20designs:%20https://www.facebook.com/jjrobots/">facebook</a>&nbsp;/ <a href="https://twitter.com/jjrobots">Twiiter</a></p><p><br>&nbsp;</p>