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| Southworth Engines Boiler Feed Pump |
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| NickG:
I know! :proj: There's not a great deal left to do on the Poppin and electric loco, just a matter of grabbing the bull by the horns really. I've then got a list on Word that I keep chopping and changing. If I go the Mabel route I'll be asking lots of advice and for a loan of your formers if possible! Our new boiler inspector pretty much condemned the old mabel boiler and probably rightly so, don't think it's worth messing about with. The sweet pea is tempting though as it's a relatively simple engine - there's a lot of parts to make, but probably the most difficult part for a lot of people (boiler) is sat there in a box all done. --- Quote ---I've got a project planned for some time in the future that would use a Sweet pea boiler --- End quote --- sounds interesting! Nick |
| sbwhart:
No Problem with the Mabel formers I can get them to you via the internal post to you if you want them. Stew |
| madjackghengis:
Really great job on the feed pump, Stew, very fine work, and it looks very nice with the castings all in all. Look forward to seeing it pumping into a boiler, the real test in the end. I am going to have to go through this log again, and get a better look at that valving, I wished I could've been there to watch with you. :beer: Cheers, Jack |
| doubletop:
Ive just finished making one of these pumps and although this is an old thread I thought we may as well keep all the information together.. It looks like its going to do what I need it to, and be able to feed a boiler at 90psi. Here it is running on 20psi air pressure and giving 60-70 psi of water pressure. 0.5 piston and 0.25 ram gives a theoretical pressure gain of 4. With losses Im getting a gain of just over 3 so if I run it at 30psi it looks like it will to the job [ Invalid YouTube link ] Stu pointed out some errors on the drawings and I have some more to share. He pointed out the error with part 6 and the bore for the 0 ring was too deep. Its also the wrong diameter. The O rings supplied are 0.25 x 0.375 with 0.625 section. So the easy way is to just bore the hole is a 3/8 slot drill. I found making them 0.060 deep was sufficient that it didnt cause the piston to bind. This applies to parts 6 and 22 The castings are very soft and I blew my valve chest off the cylinder trying to run at 30psi. drilling the holes for the 10ba studs only 0.075 deep is just not enough. However, if the holes for the cylinder ends are drilled at PCD of 0.065 then the holes for the ends caps and the valve chest can be as deep as you like (within reason) as they dont get in each others way. I did mine 0.35 deep. (Spacing to the valve chest is 0.6 and a PCD of 0.650 gives a spacing of 0.403 which mean 0.1 between the hole centers, just enough for 10ba) This is where the dimensions on part 5 are wrong A 0.5 spacing isnt a PCD of 0.650, radius of 0.325. The 0.5 spacing gives a PCD of 0.707 and the holes will clash with the valve chest holes as they are only 0.05 apart. I also did a PowerPoint to show how it works, attached below Hope that helps somebody Pete |
| tom osselton:
--- Quote from: lordedmond on April 13, 2011, 02:45:10 AM ---Stew nice work what with your pussy faux pas now we have "fag" paper :doh: what will our friends across the pond think "gay paper" :jaw: --- End quote --- So dandruff would be fairy dust then! ! :bugeye: |
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