Floor pressure how much (feet not whole stand)

[Member No. 1]

Yes the legs are 80mm x 40 mm or 1.575" x 3.150".

Cheap? Haha! With this new 120G build I'm looking cheap in the rear view mirror!

Stand alone was a little over $1,600.
Then plywood for the top and inside shelf alone with paint was another $150
Stand is not skinned, I wanted the industrial look. I also used 80/20 in the 40-4040 size to incorporate a built in light rack.
Understand lighting $50
Apex 2016 and modules mounted in the end along with a iPad mini for a display, and (4) MP40wQD Controls
Front black sliding doors are removable.

All said and done, was about $1,800

 

[davocean]

Interesting question about the sheer on those bolts. A little super quick digging (aka google) found info showing a 1/4-20 bolt has a sheer strength of 1500 lbs (of course depends on other factors as well), then trying to figure out how much sheer would actually be applied in an earthquake... well that is the hard part, but did find a formula by an earthquake retrofit company that has a formula used for houses, well my tank is a baby house right? And it was the most easiest formula that didn't require much thinking Basically 0.2 x Weight, so 2500 x .2 = 500 lbs of sheer. Now could it be more? Sure, but I'm guessing if "the big one" hits then me worrying about the bolts on the tank is the least of my worries, plus I would think the bolts of the stand would also be suspect as well.

I have to wonder how that formula applies as pins sit taller, meaning the more out of level, the higher the pins, the more vulnerable.

My stand held up fine in a 6.3 which is a pretty good one, but yeah I agree bigger than that and issues could be other bigger things...

As a contractor living in CA myself I just pay a lot of attention to this, so far I've never heard of a shim failing.

My other thought is how a lot of our metal fasteners seem compromised these days, and keep in mind stainless will vary in strength and quality, not sure how you can know w/out just trusting the manufacturer that you got what you ordered for sure, so much Chinese crap is substituted for cheaper materials, so don't cheap out, perhaps make sure US made would be my suggestion.

 

[sfsuphysics]

I have to wonder how that formula applies as pins sit taller, meaning the more out of level, the higher the pins, the more vulnerable.

Yeah I'm sure the formula is a very VERY rough generic one used by that particular company that popped up on google just to give a feeling for how much sheer they prepare for when they reinforce the mudsill to the foundation or strap the vertical beams or whatever. Other than that though I can't really guess on how much sideways force will be.

My stand held up fine in a 6.3 which is a pretty good one, but yeah I agree bigger than that and issues could be other bigger things...

As a contractor living in CA myself I just pay a lot of attention to this, so far I've never heard of a shim failing.

No I haven't either, but the idea of feet was basically to allow airflow under the tank in the case that water gets there I'd like it to air out as opposed to having a "box" sitting on the floor, I mean there would be air pockets under the tank, but ultimately no airflow, and if I was worried about what the feet would do to a floor.... I have plenty of experience in reefing with wet floors that aren't allowed to dry

My other thought is how a lot of our metal fasteners seem compromised these days, and keep in mind stainless will vary in strength and quality, not sure how you can know w/out just trusting the manufacturer that you got what you ordered for sure, so much Chinese crap is substituted for cheaper materials, so don't cheap out, perhaps make sure US made would be my suggestion.

True, but sourcing material seems to be harder and harder these days. I mean I got a good source for stainless fasteners, but they don't always have the fasteners I need (in the case of 8020 they don't have the "t-slot" nuts, but I probably can use their bolts on them.

 

[sfsuphysics]

Yes the legs are 80mm x 40 mm or 1.575" x 3.150".

Cheap? Haha! With this new 120G build I'm looking cheap in the rear view mirror!

Stand alone was a little over $1,600.
Then plywood for the top and inside shelf alone with paint was another $150
Stand is not skinned, I wanted the industrial look. I also used 80/20 in the 40-4040 size to incorporate a built in light rack.
Understand lighting $50
Apex 2016 and modules mounted in the end along with a iPad mini for a display, and (4) MP40wQD Controls
Front black sliding doors are removable.

All said and done, was about $1,800

Well I wanted the "fun" factor of playing with an adult Erector set (thankfully auto-correct didn't make that an embarrassing statement!), and in order to justify I had to make sure it would be "cheap", I mean I can make a wood stand for quite a bit cheaper that it isn't funny. But this is going to be my little piece of "art" so having some pretty is a necessities, big issues was sourcing out those fasteners because buying them 8020 they are quite a bit more expensive. I figure the vertical strength can EASILY be held with the size of material I went with, and I do plan on bolting full sheets of plywood in all 3 dimensions that it can move to prevent racking so not worried there.

Who knows maybe this summer I'll find some time and actually get around to building it

 

[Member No. 1]

Adult Erector set was exactly how I described my stand.
With this new build, I knew it was going to be costly, but I promised myself
that if I couldn't correct all the little PITA things that I don't like about my current 80g, and do everything right, then don't do it at all.

http://www.reefcentral.com/forums/showthread.php?t=2661614

Since I am not skinning the stand and the structure would be exposed, I went with the 80x40mm for aesthetics. It's way overkill. You could park a truck on it!
I used all 80/20 fasteners. https://8020.net/shop/40-3362.html

This was in the early stages of construction. It's progressed a lot since then.