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| Potty Lads and Dads Engine |
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| vtsteam:
Looks and sounds great! I make it out to be running 545 RPM in the video. :clap: :clap: |
| sbwhart:
Thanks vtsteam I've been running it know for about 4 hrs chased a few tight spots out of it and reset the valves a few time so that it will run forward and reverse its getting nicely bedded, had the tacho on it and at full pressure 50psi it licks along at 1500rpm and it will throttle down to about 15psi at 400 rpm. Stew |
| garym:
Thanks for this excellent thread Stew. I'm building a Stuart S50 as my second project and threads like this are very educational. I'd like to have seen it at Harrogate but I'm going on Friday. :doh: Gary |
| GordonL:
Looks good. I do not understand why the special valve rod arrangement. Wouldn't the threads on the two clevises as shown on the original design have allowed valve adjustment? |
| sbwhart:
--- Quote from: GordonL on May 06, 2013, 07:21:40 AM ---Looks good. I do not understand why the special valve rod arrangement. Wouldn't the threads on the two clevises as shown on the original design have allowed valve adjustment? --- End quote --- Hi Gordon Yes there would have been adjustment on the clevises, that was the plan, but the more I thought about it the less I liked the idea, it would have been limited and awkward to use, and not as easy to make as what I ended up with. I also found this info on the engine that I saw at Bolton extract from NMES http://www.nmes.org/ When a steam engine with large cylinders became worn, so that the piston no longer fitted properly, it was common to re-bore the cylinders, making them a fraction of an inch larger. However, since the casting often weighed many tons and removal to a workshop would have taken too long and been too expensive, the work was frequently carried out on site. This small engine would have been used to provide power to the re-boring equipment which was clamped to the cylinder being re-machined. The slide valve is driven by an eccentric on the crankshaft that can easily be moved to another position to alter the timing so that the engine can run in either direction. End So apparently this valve arrangement had practical uses. Thanks for you interest Stew |
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