YouMagine

gzumwalt

over 6 years

@dowd13 I found my springs and o-rings on line in these "assortment" boxes: Capri Tools CP100040 for metric o-rings Maxcraft 7707 for springs. The ball bearing can be ordered on line or as I found mine, in a local hardware store. Best of luck!

dowd13

over 6 years

So, Looked around and couldn't find the exact dimensions of the spring, O-rings, and ball bearing. This is what I am looking to order soon from McMaster-Carr unless you can point me to the source you used, if you remember. * Hard Wear-Resistant E52100 Alloy Steel Balls 6.500 mm Diameter * 302 Stainless Steel Compression Spring, with Closed Ends, 0.375" Overall Length, 0.3" * Water-Resistant Neoprene O-Ring, 1/16 Fractional Width ID: 0.070", OD: 0.210", Hardness: Durometer 70A (Medium) Let me know what you think.

gzumwalt

over 6 years

@dowd13 Beautiful, congratulations! Again, just be careful with it! Greg

dowd13

over 6 years

Words of caution heard clearly, thanks guys, I promise to be careful. Before hooking up to a CO2 I will use a hand pump apparatus from a science experiment kit I had on hand. It too had a compressed air motor but with such a novel design I didn't care to experiment with it. Greg, what sizes are the two ends of the threaded rod? Newt

greenbriel

over 6 years

Thanks Greg! I'm also extremely paranoid around compressed gases. I've made a couple of high powered potato cannons in my time and always over-engineered the safety after reading that PVC fails catastrophically and the shards don't show up on x-rays :0 I used to wrap the pressure chamber in old jeans, layers of duct tape, and then clamped metal gutter pipe around it! Cheers, -Gabe

gzumwalt

over 6 years

@greenbriel Excellent suggestion! And again, proceed with extreme caution! During tests and the making of the video, I used a full face shield, leather gloves (after sticking my finger in the propeller path) and chest protector. Greg.

greenbriel

over 6 years

@dowd13, yes, good luck, don't blow yourself up! If it works with a cartridge, try hooking it up to a 20lb CO2 cylinder! That would actually probably be safer than the cartridge because you can gradually raise the pressure with a regulator.

gzumwalt

over 6 years

@dowd13 Good luck, and proceed with extreme caution! Thanks, I'm glad you enjoyed the design!

dowd13

over 6 years

Printing this now in all ABS, wish me luck, I have no idea of the results. If it works at all, I have thoughts of connecting this to a CO2 cartridge and see how long it runs. From there to see about optimizing it for longer runs. I have to say I do like the design, great job on that.

gzumwalt

almost 7 years

@ greenbriel, Thank you very much for your kind words, I truly enjoy it when a design I've created brings a smile! Great minds think alike. An early version channeled air from the fan back into the compressor so efficiently, I couldn't stop it! ;-D. Thanks again!

greenbriel

almost 7 years

Another brilliant design, Greg! I love this one. Now if you could just figure out how to channel the air from the fan back into the compressor you could have another perpetual motion machine in your portfolio ;-D

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