Old 01-25-2017, 04:29 AM #1
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Default Project Turbo-Fruit: exploding orange - Gforce testing

Centrifugal stress testing of the produce department.
How many G's can an orange survive?

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Old 01-25-2017, 05:09 AM #2
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Default Re: Project Turbo-Fruit

Oh-My-God,
I would get in so much trouble doing this at work xD
Now I just need an excuse by buy a decent air compressor to make some citrus spin such as limes or clementines. might even be able to get some of the organic apples to spin aswell although I imagine those would hurt if/when they failed.
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Old 01-25-2017, 05:21 AM #3
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Default Re: Project Turbo-Fruit

I'm already working on making those into videos too. I'd like to make a list of rpm tolerances... for reasons. I want to do a coconut and other large fruit, but I can't start there for lots of reasons.

I've started with oranges, tomatoes, kiwi, lemon, lime, apple.
All of which will be posted when I have time to edit. There's a lemon test on my page, over 4500rpm, but it didn't pop
Clementines work well on small compressors. Safer too. Good Turbo sound.
Limes and lemons want to spin oblong after you get up to speed, so I'm having some issues there.
Apples are dangerous.

The hardest part is getting the laser tach to work since the stickers don't stick at 1500+ RPM. Even spray paint doesn't like it at 4k.
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Old 01-25-2017, 05:56 AM #4
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Nice. Can't wait to see those vidoes. Might just have to show my manager this one with the orange. He would get a good laugh out of it.
Maybe use a large ABS pipe elbow cut open to make the cupped shape so you don't have to hold the more dangerous produce items?

I bet the tomatoes did not hold up too well and made a nice mess.

Now we just need grapes to be back in season again for the globe grapes and muscadines. (I don't count chilean fruit as "in season")

Trying to think of other produce items that might spin well and not cause too much damage when they fail. Think you have just about covered it though with your list.
On second though, I can think of peaches, plums, and nectarines if the pit would not be too much of a risk.

Would the spray paint stay on better if you scratch the protective wax off of the produce with a dull item?
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Old 01-25-2017, 06:10 AM #5
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Previously washed with lacquer thinner and it'll hold until it wicks up more oil. Citrus oil is great at cleaning so...
I did that for the stickers, not when I spray painted it. Lemons need it though. I have to redo them.

Abs or metal curve is in the works, maybe a big ported tube. The safe things will be done first. Harder objects require more rpm, and unfortunately they're harder when they fly apart.
#fruitsalid #salsa

As for at work. Grab a few of the cuties/tangerine size and hope it doesn't hit the bosses shirt.
Start by finding a screwdriver that you can levitate in the air handle side up. Just blow on it, there's videos out of that trick. You'll figure it out. Then when he's confident of your "magic" pull the tiny orange out of your pocket.
Safety glasses, don't have it rotate towards you or him.
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Old 01-25-2017, 06:13 AM #6
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

haha, I still would have to get an air compressor and that would kill my "i want a 589nm laser" budget.
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Old 01-25-2017, 06:15 AM #7
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Work doesn't have a compressor?
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Old 01-25-2017, 06:18 AM #8
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Nope.. About the fanciest thing we have in my department is a shop-vac for the pesky onion/garlic skins.
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Old 01-25-2017, 06:39 AM #9
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

I'll show you how to peel an onion...
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Old 01-26-2017, 01:05 AM #10
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Hmm.. maybe if you get a small enough onion (like a chalot) that could fit the larger ultracentrifuge tube.

At that g level you'd probably be easily separate the peel from the contents, though i'd worry the center of gravity shifted during the experiment to point where it destroys the centrifuge (and probably anything near it). Even if balance is okay to start with, if you counter-balance 2 onions there is no guarantee they will each come apart at the same time, and in the middle of a 100.000 g run this would be -very- bad
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Old 01-26-2017, 01:44 AM #11
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Well for larger objects I'd try a large drain tube, like 12"
I don't want to construct an arm style tester because it would change the forces on it from centrifugal to linear g force
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Old 01-26-2017, 01:44 PM #12
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Video ain't workin' for me. Get an error message.
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Old 01-26-2017, 01:53 PM #13
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Hey Steve, it didn't work for me either, but you can just click on the link above the Video, that seems to work ok.
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Old 01-27-2017, 01:09 AM #14
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

Quote:
Originally Posted by Presentteck View Post
Well for larger objects I'd try a large drain tube, like 12"
I don't want to construct an arm style tester because it would change the forces on it from centrifugal to linear g force
Ultracentrifuges don't come that big as far as i know.

Fixed angle rotors go up to perhaps an inch in diameter and that already is considered very large for lab use. Most of the ones i used actually fitted much smaller tubes, in the order of 8 or 10 mm inner diameter.

There is no way to do this with a centrifure that has arms that swing out (like the type used for separating blood cells and plasma). The forces on such rotors are enormous, if a rotor unit breaks it can send the whole ultracentrifuge machine (about the size/weight of a commercial washing machine) trough a brick wall without a problem.
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Old 01-27-2017, 01:53 AM #15
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

When he said onion counterbalanced with another on either side I was imagining a few feet of bar stock on top of an electric motor, onion on either end.

But a large tube with air jets at an angle could get larger objects up to speed... if the pressure needed wasn't enough to hold it together.
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Old 01-27-2017, 02:13 PM #16
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Default Re: Project Turbo-Fruit: exploding orange - Gforce testing

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Originally Posted by Presentteck View Post
Centrifugal stress testing of the produce department.
How many G's can an orange survive?

https://www.youtube.com/watch?v=xojjoK3jmOc

Obviously a Go pro camera can't capture what is actually happening. Here's a suggestion. Contact the "The Slow Mo Guy's" on YouTube. They have cameras capable of capturing fast motion. Maybe they'll do a video.
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