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Searching for an Acrylic Hollow Sphere

post #1 of 16
Thread Starter 
Hey guys, I've been using the Googles and they bring me no fruit for my labor. I'm planning a custom piece for a top secret project and I need an acrylic hollow sphere, preferably seamless or 1 piece, 0.5" thick or more, and about 8-10" inner diameter. I have one plastics supplier out of the midwest that quoted me $170 to custom make a 2 piece version that I'll have to cement together.. I was hoping to see if anyone else knew of a plastics company or even a household item or home depot like thing i could use. Basically I'm making a spherical reservoir for WC and I need it to be thick enough for me to make threads for barbs to screw in safely. any ideas? i beg of you OCN to harness your collective resources and help me out thumb.gif
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post #2 of 16
You could buy a thinner sphere and just add pieces of thick-walled tube into the tube to thread into.

But to your main question, no. I don't know of anywhere that sells something that thick, anywhere.
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post #3 of 16
Thread Starter 
well ive done more research and called around a few plastics companies and it looks like ill have to settle for 2 hemispheres to get the thickness i want thatll be cemented together. im considering using 2 hemispheres that have flanged edges so that there is a perimeter edge around the middle that i can put bolts through, partially for style, partially for structure.

soo, now that my search is refined, anyone know where i can get acrylic hemispheres at a decent price that arent paper thin like a christmas ornament?
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post #4 of 16
what about a dome for a skylight?

these come up to 1/4" http://www.globalplastics.ca/domes.htm
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post #5 of 16
They have an option for seamless spheres here...

http://plastic-domes-spheres.com/plastic-spheres/
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post #6 of 16
Thread Starter 
oo thanks for the info so far everyone.

lol earlier today i called a plastics company out of Missouri that makes awards and other random shapes and asked about seamless hollow spheres and the guy asked me what planet i was from that had physics allowing for such a shape doh.gif

thanks Tnt6200 I'll send a message to those people at that link you provided, we'll see how it goes.

also, thanks duceanahalf, ill message those guys and see if they do custom thickness.

basically, im going to make a spherical reservoir one way or another, and if i get a good method down ill be potentially selling kits to those interested.

for those wondering what the hell im even planning on doing with a spherical res, take a look at my current custom external wc loop i made here:
http://www.youtube.com/watch?v=RqjY6bZ5FG0

i made it last winter, this winter i wanna do ver 2.0 thumb.gif

im going to make my own res, obv, and this is why this thread exists..
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post #7 of 16
BTW, 1/4" thick is more than strong enough to tap with G-1/4 threads for the WC barbs.
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post #8 of 16
Thread Starter 
it is? ok, i just dont want to ruin the whole structure so i was thinkin hardcore with the 0.5". if im going to tap 1/4", should i follow any technique for dealing with the curve of the surface? was thinkin maybe i need to buff/mill/grind, w/e, a circular flat area before tapping and drilling so that the barb can seat against a flat surface..

oo, btw, i bet the thickness will alter my price quotes quite a bit.. apparently 0.5" thick = pricey from what ive seen so far..
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post #9 of 16
    
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post #10 of 16
Quote:
Originally Posted by silverh20 View Post

it is? ok, i just dont want to ruin the whole structure so i was thinkin hardcore with the 0.5". if im going to tap 1/4", should i follow any technique for dealing with the curve of the surface? was thinkin maybe i need to buff/mill/grind, w/e, a circular flat area before tapping and drilling so that the barb can seat against a flat surface..
oo, btw, i bet the thickness will alter my price quotes quite a bit.. apparently 0.5" thick = pricey from what ive seen so far..

Thickness makes a huge difference in price; most reservoirs and waterblocks have 1/4" walls, but if you're paranoid due to the curvature, you can go a bit thicker but 1/2" is way overkill.

Yeah, use a sander and make a flat spot (can be done after drilling the hole); this will make it a lot easier to get the tap started and also allow the O-ring to seat nicely to ensure a good seal.

Also, when drilling/tapping acrylic I like to use a bit of water as a lube since this produces cleaner holes/threads. Further, don't start out with the bit for the final hole size; start with maybe 1/16 or 3/32 then slowly step up to the desired hole size or the dia you need for the pilot of a spade bit or hole saw.

Another tip for tapping is not to try to force the tap all the way through, but rather run it in a few turns then back out a bit , then in a few more turns; and be sure to occasionally back the tap all the way out before running it in further. This cleans out the cutters on the tap making it easier to make the threads.
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