Stirlingengineforum.com

HIGH SCHOOLERS! wow great work, Im in grade 12 now and as far as i can see there may only be one person close to me in engineering in my school. everyone else is kinda dumb or not interested in building things... (*it also doesnt help that the new teacher has ruined the shop for the year) Great job ...

Im making an engine very slimier to this (6 inch OD plexi tube) the thread is here >>> http://stirlingengineforum.com/viewtopic.php?f=1&t=1044

I cut my tube to 1 1/8 inch tall and used a 3/4 inch displacer of foam.
still a WIP, check it out though

what age are these students of yours? I wish I was in a class that awesome!

BTW: nice lights for the track.

ok, first off, i think i want a link to that comic if it's avlible. :) I think the most recognizable forms would be one of these two... A lot of different designs may get confused for other things since the parts get hidden. https://encrypted-tbn1.google.com/images?q=tbn:ANd9GcSJ_EbWXLsBRdHNAX6axt8A...

is ∮ = to MM? havnt seen it before and google wolnt search it

yeah, the laser would need about 10 more watts to be able to punch through the 1/2 inch metal at the right speed. he doesnt cut stuff this thick often... and when you do cut things this thick it usually doesnt need to be so small. they'll work though. just need to do a little agressive polishing. wi...

UPDATE! got some new parts, need work though. The first two will be the stands for my crank shaft, the laser cutter didn't like cutting metal that thick, so it got kinda mealy... it can all be fixed with a little time, but I have to be careful not to make them uneven. http://img198.imageshack.us/img...

Sourcing parts at a reasonable price (or at all if they exist) can be a difficult challenge. We should all share what we know in one thread so we can all find just that piece we're looking for. :) company name, site, product, price... whatever you got. To start off: http://www.beckergraphite.com/sto...

Great little engine for so many household pieces.

just one question... where do you fine bearings so tiny?

Great job, just one question.

Is it supposed to be that loud or is it just a really sensitive camera? It almost sounds like a piston is bottoming out with how loud the video is.

well I'll be getting graphite from here soon: http://www.beckergraphite.com/stock.html it's soo much cheaper than anywhere else, and shipping is just ups or usps, so you pick, i'd buy a few at the same time though, shipping shouldn't cost any more. check this out though, linear actuators, with free ...

Thanks, i imagine it would polish nicely like that, so i can just cut it a hair oversize. It is a fine grain graphite though... wonder if that makes a difference. probably not. The aluminum was mainly so it wouldn't look bad, i didn't have much in the way of paint that doesn't melt foam. I will not ...

I had a question about tolerances, 1) With a graphite piston inside a polished stainless steel tube, how small is that fraction of a thousandth you need for clearance? 0.0005? less? I know less is better, but i don't know what i'll have for a lathe till i look for it. might go to the community colle...

well, looks like i have to make a slightly smaller piston, but im going with a piece of polished stainless tubing for a cylinder. It'll have to turn the graphite down to the right size, might look into doing that elsewhere if possible... on the plus side, looks like this will be a pretty slick proje...

Where might one be able to find 1'' ID brass tubing? I look online and can find a little bigger and a little smaller... The graphite material im looking at for a piston is 1'' OD, so I could go a little bigger for the pipe size but I dont know what kind of tolerances i need to keep a good seal, or h...