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| sbwhart:
--- Quote from: bogstandard on January 19, 2011, 02:51:28 AM ---This is looking really well now Nick, and I am sure you will have it running in no time. Do what I did when I made my vid for the swing up threading tool, stick the camera onto a mag base, it only took a few minutes to make up a plate to get the two married together. http://madmodder.net/index.php?topic=2323.msg25332#msg25332 John --- End quote --- Yep thats what I did having seen Johns works a treat great for taking stills as well removes camera shake. Engine looking good Nick :headbang: now lets see you whip it :whip: into life. Stew |
| NickG:
Thanks lads, forgot to mention I have to saw it from the stock adn face to length too! I didn't notice that optical illusion on the last photo before, it looks like there's a raised hump but actually it's just the pattern made by the end mill when I was trying to touch on! Or is that just my eyes?! Great idea for the camera John, will definitely get onto that. I made a tripod for a uni project once (I say I, it was supposed to be a group project but I was the only one interested it getting my hands dirty!) have no idea where it is now, I remember robbing bits of metal off it at some point though! It will be more useful in the workshop to mount it on the mag base though. Nick |
| AdeV:
Nick, that's starting to look like a bought one ;) Nice work, glad the graphite machined OK. Just a thought, is it light enough for this application? It looks like the piston is still quite a solid lump, I wonder if you don't need to machine a bit more out of it to feather-weight it a bit? |
| NickG:
Hi Ade, thanks and thanks again for the graphite. Not sure, you're right it does look quite solid, I was wondering about that as it is the only deviation I've made from the plans. The cast iron piston I made like that for the Jan Ridders flame gulper didn't work! But I thought a really thin wall with the graphite piston would be unnecessary as it's a lot lighter - that was my thinking anyway. Just had a quick look on tinternet and found the following: Graphite is approx 2.09 - 2.23g/cm^3 Cast iron is approx 6.8 - 7.8g/cm^3 So cast iron is pretty much 3 x the density, I could model the two to check the weight but remember with the cast iron piston you've also got the yoke and screw so hopefully I should be ok for weight. I'm not sure whether I've got the fit loose enough but it seems to slide easily, drops through most of bore under it's own weight but seems a good seal so fingers crossed! I think it will quickly wear to where it needs to be. The bit I'm more worried about than anything else is the big end. It doesn't have a ball race as per how Jim modified his, just a plain brass bearing. Think it will be the highest source of friction on mine. The roller rubbing on flywheel or flywheel on uprights could be another issue but I can mess around with washers etc to minimise anything like that. Nick |
| arnoldb:
Well, you're cracking right along now Nick :thumbup: I'll openly admit I'm way too chicken to try and run those small taps under power! :beer:, Arnold |
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