Desktop Catapult

prusaprinters

<p>This is a simple catapult that I designed for a class project. Disclaimer: It has not been optimized.</p><p>You will need four(4) M4X20 bolts, four(4) M4 nuts, two(2) bearings, one(1) 100MM metal rod, one(1) rubber band, and one(1) 20MM spring(optional).</p><p>Metal Rod <a href="https://www.amazon.com/gp/product/B082ZP5CLB/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&amp;th=1">https://www.amazon.com/gp/product/B082ZP5CLB/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&amp;th=1</a></p><p>Bearings <a href="https://www.amazon.com/gp/product/B07C6FL8TW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&amp;psc=1">https://www.amazon.com/gp/product/B07C6FL8TW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&amp;psc=1</a></p><p>Bolts and Nuts <a href="https://www.amazon.com/gp/product/B073SWXPYR/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&amp;th=1">https://www.amazon.com/gp/product/B073SWXPYR/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&amp;th=1</a></p><p>Spring(Used spring from Ender 3)</p><p>These are what I used.</p><ol><li>Place the BEARINGS inside the slots in the LEFT FRAME and RIGHT FRAME.(Place a towel over them and gently hammer them until they are flush)</li><li>Press the ROD the hole on the ARM.(Center the ARM on the ROD)</li><li>Place the ends of the ROD through the BEARINGS inside the FRAME.</li><li>Press one(1) NUT into each slot in the CROSS BEAM until they reach the bottom.</li><li>Line up the hole of the CROSS BEAM with the LEFT FRAME and the RIGHT FRAME and insert the BOLTS.(They will screw into the NUTS in the CROSS BEAM)</li><li>Repeat steps four(4) and five(5) for the REAR FRAME.</li><li>Insert the SPRING into the hole in the REAR FRAME.</li><li>Depress the SPRING and slide the ARM CATCH into the slot in the REAR FRAME.</li><li>Wrap one end of the rubber band around the ARM and loop it over the CROSS BEAM and wrap it back around the ARM.</li><li>Pull ARM back until the ARM CATCH latches.</li><li>Load ammunition of choice.</li><li>Depress ARM CATCH to fire.</li></ol>