Recent content by vederstein

I'm still tickled that the video above I made at the 2023 show just to document for myself. I has no idea it was going to used by others.

I threw together my photos/videos I took of the show. No editing or effort put into the video at all.

Ok, Let's go the other way. Below is a short video of one of my casting pours. I'm not trying to be stupid here. Review and let me know what, if anything, I'm doing wrong. (I already noticed my arms were bare and I wasn't wearing a jacket. So you can skip that critique.) ...Ved.

I've attended NAMES once as a spectator. As stated in another post, I'll be going to the Indiana Show as an exhibitor. This will be the first time exhibiting at strictly model engineering show. I have exhibited my engines at various Maker Faires over the years. It's good fun. At the Maker...

This will be the my first show as an exhibitor. Must admit I'm a bit intimidated by what some you true craftsman can do. I'm at the other end of the perfectionist scale, but most of my engines are of my own design and what I display is the prototype engine. (Sometimes it's the only one in...

I believe I've seen the actual engine. It's on display at the British Science and Technology Museum (or whatever it was called). Great work you've done.

TIny parts. Ugh.... Any ideas what type of lathe he's using?

Those that were following, know that this air motor was to be an "ultra-quiet" air compressor pump. Well the performance was abysmal. It wouldn't pump air worth a damn regardless of what I did to it. The only thing to do was to build up a base and reassemble the thing into an air motor...

I made up the port brushes, found some applicable springs in my stash, and reassembled the engine. (No reason for pictures because, externally, it looks the same.) Performance is worse than before. Therefore: I'm done. This project is officially a failure. Not that I didn't learn things...

I never got that far. If I was in the 50-70 psi range, I'd agree. But with only 10 psi there's far bigger issues going on. When I get the brushes made/installed, there will certainly be a break-in period. I'll probably set it up outside, covered in the box. I don't particularly want to...

Looking at the design, I'm guessing the cross channel leaks are coming from the boundary layer between the body and the crankshaft. I don't it's actually happening, but possibly there's a bit of seal misalignment with the porting that's causing issues. Therefore I went ahead and added some...

Me too. I'm an industrial machine designer. I've designed machines for the trucking industry, automotive, medical, aerospace, and currently I do electronics assembly. I have five patents with my name on them and I've been doing this for over 25 years. A design, particularly a custom one-off...

Certainly a possibility. A quick calculation shows that the oil pressure against the piston o-ring is 77psi @ 1725 rpm. That's easily within the range of a buna-n oring. But yeah, there's going to be blowby. How much? I dunno. Perhaps a bit of leakage will help lubricate the crankshaft...

The thinking was twofold: As the piston went to bottom dead center, the oil on the back end of piston would get pushed out of the cylinder and then work its way into other areas. When the pump stopped, the oil would then fall onto the center bearings. As for the other comments following my...

I got all the pa;rts finished, bolted the pump to the motor and ran some tests. The results are pathetic. The pump only generates about 10 psi. Obviously there's a large amount of internal leakage. My barb hose fittings were discards from a work project. I wonder if they're sized for metric...