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| Scott Vacuum Engine...... |
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| awemawson:
--- Quote from: Stilldrillin on November 12, 2014, 08:36:18 AM --- Anyone know, where I can source 35mm dia graphite in the UK. At sensible cost? :scratch: David D --- End quote --- David, The attached pictures may be of interest - it's Poco brand EDM graphite from my stash of things potentially (Pun intended :ddb: ) to make electrodes from. POCO is a very fine grade of graphite for fine details |
| Stilldrillin:
By, 'ek, Andy! :bugeye: Yer've got me attention, now! :D Switch to pm's, I think....... :thumbup: David D |
| awemawson:
David, Tell me how much you want sawed off the (presumably) 2" piece, PM me an address and give Eric a donation in my name to the running of the site for what you think it's worth to you. I ain't turning it down to 35 mm for you - my lathe is reasonably clean :lol: |
| geoff_p:
For smaller lumps of graphite, such as your valve-block, I use carbon-brushes from/for electric motors. The local motor-repair shop keeps them up to about 1cm-square section by 4cm long, of which the braided wire connector ruins a cm or so. Am currently using this material for big-end bearings on my experimental 4-T petrol engine, where they take an awful hammering. |
| Stilldrillin:
Progressing, steadily. The runs I managed to film, were the only life I could coax out of this engine! Days after, it still hadn't run again. :bang: Condensation left a dragging film, between piston and bore. Couldn't get the engine to spin. Also, all other internal cast iron areas had a film of rust. :palm: Seems a pity, to break up this well matched partnership. But, it's time to go, rustless! Bought a length of 35mm stainless steel exhaust, 1.5mm wall thickness. The inner seam was some 8thou deep. So, I set it over in the chuck jaws, using a piece of 10 thou steel sheet. To ensure a deeper cut over the seam area. Clocked parallel to carriage travel........ Cleaned up both ends, leaving a witness........ I could then bore, concentric to each end....... Then, turn the o/d concentric to bore....... There you go....... Open up bore to +.002" on sleeve o/d........ Loctite in place. And skim the ends........ Now, waiting for my pal Dave, who's a whiz with a bore grinder. Thanks for looking in! :thumbup: David D |
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