Gallery, Projects and General > Project Logs
Scott Vacuum Engine......
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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