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| Southworth Engines Boiler Feed Pump |
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| sbwhart:
A friend and fellow madmodder asked if I could help out and build a boiler feed pump for him. The pump comes as a kit of casting complete with a set of very clear drawings from :- Southworth Engines, 6 Kennet Vale, Chesterfield, S40 4EW England. The phosphor bronze castings seem to be good quality, but if you prefer the engine could be made from bar stock. I've positioned the castings so that I don't give too much away on the drawings and have the copy right police onto me. Starting with the cylinder casting first clean the port face off just enough to give a flat face, square the ends off taking again just enough off to get things square and to have a clean surface to work with. Then mark out and center pop the bore position. In the independent four jaw chuck and using a wobble bare get the bore on centre. Nice deap centre drill then pilot drill followed by a 12.5 mm roughing drill. Finish to size with an 1/2" hand reamer. Next turn up a mandrel that a nice slide on the bore. Wrap a bit of thin paper (fag paper) round the mandrel, and push the cylinder onto the mandrel so that it grips enough to get a drive and face both ends of the cylinder to length, this way you are sure that the faces are square to the bore. The mandrel will be now used to mount the cylinder onto an angle plate so that you can mill the valve face off perfectly parallel to the bore. This is it mounted up and marked up so the valve face can be milled to size. Stew |
| saw:
I am very glad that you have taking this projet, I have thinking about this boilerpump. Nice work. :thumbup: |
| lordedmond:
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: |
| sbwhart:
Cheers Chaps Bit more done today the Boss is away visiting a friend:-so I got all day in the shed :D On with the cylinder With it mounted on the mandrel and angle plate fly cut port face to size nice and square to the bore. Drill the ports and the clamping holes for the steam chest Tap the steam chest holes nice and square Then using a coaxial indicator centre the mill on the bore and drill the stud holes and connect up the port holes using a tickle wire to indicate when the holes join up. This machines cylinder The port face plate, the steam chest cover and cylinder cover are cut from this one phosphor bronze casting. Fly cut the face and square the edges up and cut them out. Then drill the port face plate this has a similar hole arrangement to the cylinder but with more holes. Then using a 1/6" burr join up the exhaust ports This is what it looks like completed. Piston and steam chest cover yet more drilling work so not showing pics. Steam chest is yet another casting, so again clean and square it up and mill it to size drill holes and mill out the middle for the slide valves. These are the bits completed so far And lose assembly Stew |
| Bogstandard:
Coming along very nicely Stew. I especially like the way you are using the mill for most of the work. People seem to think that it should all be faceplate and four jaw work on the lathe, but like yourself, I find things like that a lot easier and quicker to do on the mill, with only basic set up requirements. John |
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