Search found 144 matches

by vile_fly
Tue Aug 25, 2015 5:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: new balancer/stroboscope for $120
Replies: 2
Views: 3139

Re: new balancer/stroboscope for $120

Oh, I forgot to mention to the others that this is a dynamic balancer tool.
I hope I can spare the change to get one. otherwise, the poor man's balancer is in order. http://www.antiqueautoranch.com/montana ... page4.html
this basically will explain also how a balancer works, also.
by vile_fly
Mon Aug 24, 2015 8:49 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: new balancer/stroboscope for $120
Replies: 2
Views: 3139

new balancer/stroboscope for $120

This austrailian product is a stroboscope with an IR sensor, led strobe, and accelerometer for vibration analysis. the IR sensor is used to detect the 0 degree reference mark drawn on the shaft/flywheel. I was going to build one similar to this, but this one is smaller and more compact than I could ...
by vile_fly
Mon Aug 24, 2015 8:41 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Website Links Area and Magazine Articles..
Replies: 71
Views: 47768

Re: Website Links Area and Magazine Articles..

found a $120 dynamic balancer. uses stroboscopic method of balancing and uses an accelerometer to detect vibration and phase detection.
http://www.dynexhobby.com/ originally designed for model plane propellers and such.
by vile_fly
Sat Jan 17, 2015 10:47 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Found a new seal. a WV-seal. like the vee seal, but W shaped, with less drag and more support. Here is what it looks like. Here is the link: http://www.veepacking.com/ "WV Packings While similar to Vee Packings, the WV style provides sealing properties that are largely independent of stack packing p...
by vile_fly
Sat Jan 17, 2015 10:34 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Ah, I found a good cheap supplier for hBN. They give a really good description on how the stuff behaves. It is hygroscopic due to the 5 micron or less mesh, therefore care must be taking to remove humidity from the area or it will clump. Any open container must be used immediately or it will clump u...
by vile_fly
Mon Jan 12, 2015 6:27 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Have 80mm graphite slugs ready to go already thought of that. Have enough to shut down a small reactor. I find glassblowing suppliers to have plenty of graphite for sale. Graphite + hot air = CO2. CO2 is very bad for a working fluid. The design target is for air as a working fluid, all other conside...
by vile_fly
Sun Jan 11, 2015 4:39 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Ceramic vs ceramic friction depends greatly on the ceramic, of course. ~.27 is what the paper found. rough estimate.
About the same as nylon vs nylon friction. I guess hBN is not all the great in ceramic mixes, but helps in small quantities, like 5%.
by vile_fly
Sun Jan 11, 2015 9:16 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Nice research paper, I just wish it wasn't mostly in Japanese, but it still contains useful info for sure. I found one on ceramic-hBN composites. Unfortunately, it is on google books, and I can't post the conclusion word-for-word. Scroll down to the bottom to see it. https://books.google.com/books?i...
by vile_fly
Sat Jan 10, 2015 3:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

V-twin configuration, 80mm bore, 30mm stroke. 600F isn't enough to satisfy me, 450F over a long time period will eventually decompose the teflon to make it fail. I need to go 2x over the design limit for longevity's sake. Totally impervious would be nice, but this is a search for the best material, ...
by vile_fly
Fri Jan 09, 2015 5:05 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

The IC engine doesn't have gapless top rings because they would not survive. Many racers have tried it, but even Total Seal stopped offering a gapless top ring and went with a gapless 2nd ring. The aluminum compressor piston bores ARE anodized (overhauled plenty of them) and so are the pistons in ca...
by vile_fly
Thu Jan 08, 2015 10:30 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

certified master mechanic, 25yrs. But I don't know avionic technology and methods. There may be a great number of things I have never seen, and Ian could probably shoot me down any day of the week if I am not careful. However, automotive a/c compressors use ceramic piston seals vs aluminum cylinders...
by vile_fly
Thu Jan 08, 2015 5:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Sounds like 100% sintered hBN is the way to go for piston rings if it has the same strength. This should solve many problems, indeed. A CAD program I like that is free is from www.emachineshop.com. I use it regularly to draft .STL files for my 3d printer. It also allows you to estimate costs of diff...
by vile_fly
Tue Jan 06, 2015 10:58 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

I should definitely order some from amazon for sure. alibaba web links tend to be geared towards mass production, it seems. For now, I am all about the prototype. Apparently, the hBN is also hygroscopic (water absorbing), and may make a nice dessicant of sorts for a stirling engine, too. Getting moi...
by vile_fly
Sun Jan 04, 2015 11:18 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

I like this design. Hydraulic/pneumatic cast iron seal. Would be nice if coated with hBN.
by vile_fly
Sun Jan 04, 2015 9:09 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Boron Nitride as a lubricant
Replies: 33
Views: 14806

Re: Boron Nitride as a lubricant

Do these ring seals have overlapping ends like a transmission seal? It would only make sense if they did. I imagine a thin supporting (backing) ring would have to be used, if the compressed stuff is as soft as I imagine. I was thinking a trapped ring held in place with a snap ring in a groove on the...