Bohaboy-Haas Poppet Valve Steam Engine

prusaprinters

<p>If you'd like to help me with this and other projects please consider donating: <a href="https://www.patreon.com/Steamboat_Ed">https://www.patreon.com/Steamboat_Ed</a></p> <p>2022_04_21:</p> <p>--I had a major re-think on the design of this engine a while back. The full-size engine will be built by modifying an engine from a Smart For Two car. By using the bottom half, including the crankcase, crankshaft and connecting rods the 'hard part' is already done and all that's needed is a new cylinder block, smaller pistons and a custom valve chest. Right now I'm saving up to buy an engine; they cost around $1,500 surplus. Once that is blueprinted I will upload a new cylinder block and continue upwards. Stay tuned!</p> <p>2020_08_05:</p> <p>--Complete redesign of engine in progress! Here's the list of changes:</p> <p>-Individual cylinders will be concentrated in a block to improve heat retention and to shorten crankshaft. Cylinder bore is now 2.6 inches, or 66mm</p> <p>-Crankcase has been shortened by around 2 in. or 50mm and widened by 10mm.</p> <p>-Crankshaft has been completely redesigned. Throw has been increased from 1 in. to 1-1/8 in. (28mm) or 2-1/4 in. (56mm) stroke.</p> <p>-Crankshaft has been shortened about 2 in. or 50mm</p> <p>-I'm going to scrap the reversing gear and use the controllable pitch propeller instead</p> <p>-I'm going to add provision for a starter motor for the steam version. This can double as a propulsion system for display models.</p> <p>In the next few years I'll be uploading components that can be used for Lost<em>PLA</em> Casting a 3 cylinder single acting unaflow poppet valve steam engine. At full scale the engine has a 66mm bore and 57mm stroke. The engine measures 400mm long including flywheel and shaft coupling. The crankcase takes about 3 days to print and uses nearly 2kg of filament. The engine has a swept volume slightly more than a Stuart Swan twin double acting steam engine.</p> <p>Remember to check back from time to time to see if the version numbers of various parts have changed: it<em>is</em> evolving!</p> <p>This engine will be presented in two forms:</p> <ol> <li><p>one for a plastic display model that may be run with an electric motor</p> </li> <li><p>one with material added to produce Lost PLA casting pieces that can be machined to final tolerance after they are cast. All of these files have a "C_" prefix.</p> </li> </ol> <p>--I've finished prototyping in 1/3 scale but the 1/2 scale work continues. The first Lost PLA version will be printed in 1/2 scale and aluminum castings will be machined in my shop.</p> <p>-Crankcase top and bottom can be printed with support touching build.</p> <p>-The cylinder block can be printed without a raft but in the orientation shown and with support 'touching buildplate'.</p> <p>-Print the crankshaft and cam shaft in the same way.</p> <p>-Flywheel can be printed with support from table only. Holes can be tapped M4. The keyway is probably too small.</p> <p>2020_10_16:</p> <p>-Deleted a dozen obsolete files</p> <p>-Uploaded Short_Cylinder_Block_02</p> <p>-Uploaded Short_Crankcase__01</p> <p>-Uploaded Crankshaft_20</p> <p>More to come; stay tuned but I could really use a Fusion 360 guru!</p> <h3>Print Settings</h3> <p><strong>Printer Brand:</strong></p> <p>Creality</p> <p class="detail-setting printer"><strong>Printer: </strong> <div><p>Ender 3</p></div> <p><strong>Rafts:</strong></p> <p>No</p> <p class="detail-setting supports"><strong>Supports: </strong> <div><p>Yes</p></div> <p><strong>Resolution:</strong></p> <p>Medium</p> <p class="detail-setting infill"><strong>Infill: </strong> <div><p>20%</p></div> <p><strong>Filament:</strong> Hatchbox PLA Any color</p> <p><br/> <p class="detail-setting notes"><strong>Notes: </strong></p> </p><div><p>Use supports: "touching build platform" to reinforce flanges; none else needed.<br/> This will fit on an [Ender 3](https://www.amazon.com/Official-Creality-3D-Removable-220x220x250MM/dp/B07K3SZBHJ?dchild=1&amp;keywords=ender+3&amp;qid=1612857257&amp;sr=8-1-spons&amp;psc=1&amp;linkCode=ll1&amp;tag=thingiverse09-20&amp;linkId=5419ace64a5f58b068a896710257ed13&amp;language=en_US&amp;ref_=as_li_ss_tl) if printed to half scale. <p>Half scale engines can run scooters and motorcycles.</p> <p>One third scale makes an engine suitable for a large model boat.</p> <h3>How I Designed This</h3> <p>Designed using 123D Design</p> <h3>Custom Section</h3> <p>I use an Ender 3 to print everything in 1/2 scale but it doesn't seem to be an option I can display! Full scale pieces that won't fit the Ender 3 are being done by a pal with a used industrial Delta machine.</p> </p></div></p></p></p> Category: Other