Reply With QuoteYes,my mistake is to leave it overnight there and the results are oil stains and small scratches on the alum.Originally Posted by Suzerolt
I prefer the one at Ubi and it is way cheaper there.
The formula for steel or aluminum structures are the same. Key parameters are
- Cross sectional area
- Yield strength. (i.e. force required before permanent deformation). For quick calculation on max load, take the yield strength [N/mm2] multiply by the cross sectional area [mm2] to get force [N]. Then divide by 10 to get the load in kg.
- Moment of inertia
Found a calculator for profile. http://www.8020.net/Design-Tools-26.asp
Yes,my mistake is to leave it overnight there and the results are oil stains and small scratches on the alum.
I prefer the one at Ubi and it is way cheaper there.
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Guys, in youtube, just key in 80/20 in the search box, there are lots of tutorial on this aluminium profiles.
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Thanks! That link helps alot, their calculator would cater to aluminum profile applications since its provided by the 80/20 aluminum profile company. Can have more confidence that the calculations are correct.
Okay, i've put some figures into the 80/20 calculator and came up with some numbers...
Results are based on parameters of a 60cm beam fixed at 2 sides with 70kg load evenly distributed (like on a 2ft aquarium stand):
2020 = Deflection X and Y = 0.8151mm and 0.8151mm
3030 = Deflection X and Y = 0.207mm and 0.207mm
I'd assume that the deflection results indicate how much the beam will bend under load? If thats the case, then i'd assume lower the better.
From the results, 2020 bends around 4x more than 3030, but both still bend less than 1mm, which seems to be "okay" i think (i guess as long as it doesn't bend so much until the beam looks visible bowed).
Are my assumptions correct?
Btw, i'm only calculating based on the 70kg tank sitting on just one single aluminum profile beam fixed to 2 points, not if the tank was sitting with its edges on a frame of multiple beams fixed to multiple points and vertical beams (which would be way stronger as the load is distributed across alot more profiles and supports). So it looks like a properly supported frame made with 2020 profiles would indeed be suitable for holding the weight of multiple aquarium tanks.
That means the overall cost would be much lower and it'll come much closer to matching the cost of custom making a conventional fixed tank stand or rack, so it becomes a very viable option. Time to do my shopping and building!
Last edited by Urban Aquaria; 10th Jan 2015 at 13:07.
Zerofighter, from pic it seems to be about the thickness of a standard 2ft stand. Is 3030 the same thickness as the stands made from n30?
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Yes it is roughly about the same thickness as a standard 2 feet metal stand. I am not sure about N30 stand,3030 is basically 30mm x 30mm.
If you go to Teck Cheong ask for conveyor system product list,they will hand you a photocopy of the list.
Hi UA if you are building multiple rack for 2 feet tank i recommend not to use 2020 for the 4 vertical beam, 4040 is safe just double up the 2020 profile.Okay, i've put some figures into the 80/20 calculator and came up with some numbers...
Results are based on parameters of a 60cm beam fixed at 2 sides with 70kg load evenly distributed (like on a 2ft aquarium stand):
2020 = Deflection X and Y = 0.8151mm and 0.8151mm
So it looks like a properly supported frame made with 2020 profiles would indeed be suitable for holding the weight of multiple aquarium tanks.
That means the overall cost would be much lower and it'll come much closer to matching the cost of custom making a conventional fixed tank stand or rack, so it becomes a very viable option. Time to do my shopping and building!
And if you guys are not in a hurry to build one and want to safe cost even more but the connectors online they will safe you like 80%.
Connectors online?
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Yes online.Connecters are cheaper online but you have to wait for about a week or 30 days depending on which postal services
you selected. You can find the connecters for 2020 on robotics and cnc sites. If you want the site i can dig it out for you.
If you can post links here will be awesome. Benefit many others quiet campers here too
Do they sell connectors for 3030 or 4040?
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Yes they do,you need to email them.Here are the linkIf you can post links here will be awesome. Benefit many others quiet campers here too
Do they sell connectors for 3030 or 4040?
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http://www.aliexpress.com/store/937165
http://www.aliexpress.com/store/8348...+Fitting+Angle
Say thank you everybody....
He!he!he!...just kidding....
Happy shopping!!
ooh aliexpress. yeah they have one of the best prices online provided you can wait long enough for the shipping. So far i have no problem with the sellers about missing packages. most of them are tied down by the strict laws of aliexpress, so nothing much to worry about. Frankly speaking, my LEDs are all from aliexpress and i saved a good amount of money compare to buying from sim lim tower.
If you want something fancy like adjustable angle support
https://www.adafruit.com/products/1257
Wow... i'm eyeing those sweet 2020 interior/hidden corner connectors, will probably be ordering a few lots of them. That'll massively cut the overall cost of my racks and shelves.
Thanks for the links!
Bookmarked. Thanks for the link!!
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Idol, new tanks?Time to do my shopping and building!
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For those who are building an aquarium stand,you guys can actually built together with a light stand that can be slide around.
It is like an aquarium stand with built in adjustable hanging light stand..
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