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A 48 inch fire pit(tank end) with 100 psi has like 200,000 pounds total pressure at the circumferential weld.
good weld important.
Its surprising how little pressure is needed. The surface area is large so just a little bit per inch is needed. Now, that is to just barely lift the ball. So add a little to get it levitated enought to spin with little friction.
A 48 inch fire pit(tank end) with 100 psi has like 200,000 pounds total pressure at the circumferential weld.
good weld important.
I once was commissioned to build a "hurricane" tank. Some frogs only breed after hurricane and the buyer wanted to pull vacuum and have it rain. I even included lightening and thunder (bass speaker).
2" of mercury was the vacuum number. Safety factor of 2 built in. Tank was 48" wide by 60" tall. ~733# of pressure holding power on just one side. Hurricane glass is significant. And commercially available.
A 48 inch fire pit(tank end) with 100 psi has like 200,000 pounds total pressure at the circumferential weld.
good weld important.
I once was commissioned to build a "hurricane" tank. Some frogs only breed after hurricane and the buyer wanted to pull vacuum and have it rain. I even included lightening and thunder (bass speaker).
2" of mercury was the vacuum number. Safety factor of 2 built in. Tank was 48" wide by 60" tall. ~733# of pressure holding power on just one side. Hurricane glass is significant. And commercially available.
Customer wouldnt buy it.
Aquarium folks do some techy stuff. always impressed w/that industry.
That project sounds like a whopper. customer backed out ?
Yeah the tank was $1500 in glass, plus assembly and accessories plus a little bit for me. $2500 wasn't worth it to him.
Truthfully I think he got my ideas and built himself. He did that to me on another project after that one. I stopped working with him.
I even invented a fail-safe system that would vent the vacuum if it exceeded preset safe limited. A water sealed vacuum check valve. Vacuum gets too high, water siphons into tank, then air is free to relieve the vacuum.
Collecting money. I have enjoyed Etsy. Pay up front-yes.
That sounds like a deposit job Scott. 1/2 up front...
Water + gravity is a handy tool. Dependable and constant.
Those concrete channel systems I grow plants in are level within 1/8 inch. 60' X 60' and 130' X 25'. Dump gravel in pond and rake it level to controlled water level. Within a half a gravel. then lay concrete channels on top. dead level.
Collecting money. I have enjoyed Etsy. Pay up front-yes.
That sounds like a deposit job Scott. 1/2 up front...
I feel your pain, Scott. We used to work with a guy, fabricating (mostly copper) custom lighting for the hoity-toity. He would tell me over the phone an idea that he had, or fax me a sketchy sketch. I was the intermediary, since he and mrockpicker did not get along. (Surprised? lol) We would sit down, put it to paper and work out the details as far as how to build it. This could be a custom light, or the three large copper fireplace fronts we did that got installed in a house in Boise.
We'd float our ideas past this guy we were doing the work for. He'd say it looked good, go for it, and tell us to give a high quote on the price. Sometimes we'd give him a print, other times we'd do a prototype. We had lost a few jobs, he said the customer changed his mind, or some such nonsense, didn't dwell on it much. But became enlightened to what was going on when I drove to his shop for something, and saw him carrying one of our prototypes back into his shop, after taking it next door to see what they could make it for. Yes, he did pay us for our time, and material, but I just hate dishonest people. He had told us up front that there would be 20 or so of these lights.
Anyway, it was good money while it lasted!
Before I buy a pump to float that sphere, my sister said she has a pump laying around. I told her to find it, and I'll take a look at it. I have no idea what type it is, or if it is capable of lifting that chunk o' rock. Will have to wait and see!
Post by rockpickerforever on Jun 16, 2016 0:08:01 GMT -5
Funny you should say that. I was thinking bowling ball also. Do you bowl James? I haven't gone bowling in a while, but I have bowled 200+ games. And I still want to play some four-wall racquetball!
Post by rockpickerforever on Jul 3, 2016 17:13:09 GMT -5
Wheeeee!!! Got me a small pump to lift that heavy sphere and let it spin. After doing all the figuring for what size pump I would need (thanks @shotgunner and jamesp !), I went to Harbor Freight, and based my decision on two things: Will it fit inside the bowl, and is the price right? It does fit the bowl, and the price was $12.99 plus tax. It is a 200 GPH pond/fountain pump, with 4.6' head lift. Don't know what the PSI of it is, they don't tell you.
Anyway, it is working, and I could just sit and watch it for hours, lol.
Wheeeee!!! Got me a small pump to lift that heavy sphere and let it spin. After doing all the figuring for what size pump I would need (thanks @shotgunner and jamesp !), I went to Harbor Freight, and based my decision on two things: Will it fit inside the bowl, and is the price right? It does fit the bowl, and the price was $12.99 plus tax. It is a 200 GPH pond/fountain pump, with 4.6' head lift. Don't know what the PSI of it is, they don't tell you.
Anyway, it is working, and I could just sit and watch it for hours, lol.
Just a fun thing!
Fantastic!
Actually, 4.6 feet of head lift (pressure) does tell you the pressure.
A water baramoter is 33' tall. This tells us that a 33ft column of water is equal to atmospheric pressure, 14.7 lb/sq inch.
So 4.6 ft / 33 ft X 14.7#/sq inch = 2.0... psi
Should run your ball nicely. I cannot view the video on ipad, but I am jealous!
This space is for temporary chat only and all posts drop off automatically and are not saved.
Members with real questions or comments that need an actual response, please post on the main forum - not here! Casual PG-13 posts only, no politics or religion please!
rocknrob: That was one heck of a windstorm that thankfully missed me. I guess Seatac almost hit 60mph gusts. I bet those were some fun landings
Nov 20, 2024 21:55:16 GMT -5
rocknrob: I'll always love my pet rock, he's such a geode boy.
Nov 22, 2024 9:27:33 GMT -5
Welcome to the Rock Tumbling Hobby Forum where we share a love of rocks and a sense of community as enduring as the stones we polish.
The RTH Forum of www.RockTumbling.com is an Amazon Associate site and we earn money from
qualifying purchases you make after clicking on our links such as this
Rock Tumbling Supplies on Amazon
link for instance, or any of our various product ads and banners. By clicking our links every time you begin your Amazon shopping
experience, you are generating a bit of revenue for the forum which helps us cover our expenses. Thank you for your support!
