Oscillating Cylinder Motor for LEGO

prusaprinters

<p>You can see it in action <a href="https://youtu.be/-a7MpJx4nnI">here on Youtube</a>.</p><p>Work animation in 3d viewer (Sketchfab): <a href="https://skfb.ly/6ZxOs">https://skfb.ly/6ZxOs</a></p><p><strong>Z_Plate_ALL_PARTS.stl</strong> contains all the parts on one plate.<br><i>Can be printed with 0.6 (or smaller) nozzle, at 0.2 layer height.</i><br><i>Takes about 7 hours (and 14m of filament) to print at 20mm/s.</i></p><p>Way more leaky than the <a href="https://www.prusaprinters.org/prints/25432-air-balloon-motor-for-lego">Radial Motor</a>, but looks a bit cooler, with all the moving parts exposed. Runs for about 15 seconds on a double wall balloon (one balloon inserted into another). Can run on a single balloon as well, just needs a lip from the 2nd balloon for the sealing.</p><p><br><strong>Extra parts needed:</strong></p><ul><li>Nitrile or PET glove fingers for the membranes</li><li>Bolts: M3x6 *x9*, M3x8(or 10) *x2*, m3x14 *x2*, m3x10(or longer) *x2*, m3x26 *x1*</li><li>M3 nuts *x4*</li><li>Two air balloons</li></ul><p><br><strong>Assembly:</strong></p><p>No assembly video, consider it being also a puzzle. And use this demo in 3d viewer as a guide <a href="https://skfb.ly/6ZxOs:">https://skfb.ly/6ZxOs:</a></p><ol><li>Cut a finger tip off a glove</li><li>Put in onto a *4_3_Cylinder_Ring* part</li><li>Insert the *4_1_Piston* into the *2_1_Cylinder_L_Front*, it should move freely</li><li>Put the *4_2_Piston_Washer* onto the piston end</li><li>Put the 2nd washer, so the glove finger tip would be fixed between the washers</li><li>Insert the Cylinder Ring into the Cylinder, remove the slack from the glove finger</li><li>Attach the *2_2_Cylinder_L_Back* with 3 M3x6 bolts</li><li>File down the flat part (with intake holes) of the assembled cylinder to remove the seam and layer lines</li><li>File down a little bit the flat parts (with air holes) of the *1_1_Base*</li><li>Insert the *1_3_Axle_Pin* into the *1_1_Base*</li><li>Use the model in 3d viewer as a guide for the remaining parts</li><li>After the assembly, press the cylinders towards the base with the bolts at the sides - there shouldn't be too much friction between the cylinder and the base</li><li>You may use some lube on the piston shaft and the other rubbing parts</li></ol><p>&nbsp;</p><p>Parts with <i><strong>X_</strong></i> in their names are optional - you may assemble one-cylinder motor using the <i><strong>X_3_1_OneCylinder_Lid</strong></i> part, or a motor with single-acting cylinders using <i><strong>..._HalfCylinder</strong></i> parts. The second one works quite poorly even on 2-walled balloon, but runs for almost 30 seconds and makes a cooler sound.</p>