Sorry yeah I meant the part that sits under the tank. The font to back measurement is 84cm from the outer most part of the beam or 79cm if using the groove made for a MDF top.
Ahhh nice.
How wide are the "ledges" in those grooves? (Does that make sense? The grooves form an L- shape so one could slide in a tightly cut piece of wood or metal as a table bottom.)
If the L-shape is 2.5 cm, for example, you could easily have 79 cm 2x4's cut to fit snugly so they can't slide out. That would be ideal compared to going across the 84 cm width and worrying about them sliding about.
Is that what you're thinking?
So let me do more math.
Let's say you have a 29 on one shelf going lengthwise to the stand.
That's 30 inches long. If you have 2x4's underneath, going perpendicular to the tank, (and to the stand) you'll have ~nine 2x4's under 290 pounds of weight. That's ~32 pounds per 2x4. That's really not a problem, even if the tank is dead center over the 2x4's, which it probably wouldn't be anyway.
The other tanks have different dimensions, but importantly are not nearly as tall as a 29, so the load per 2x4 is smaller still.
How wide are the "ledges" in those grooves? (Does that make sense? The grooves form an L- shape so one could slide in a tightly cut piece of wood or metal as a table bottom.)
If the L-shape is 2.5 cm, for example, you could easily have 79 cm 2x4's cut to fit snugly so they can't slide out. That would be ideal compared to going across the 84 cm width and worrying about them sliding about.
Is that what you're thinking?
So let me do more math.
Let's say you have a 29 on one shelf going lengthwise to the stand.
That's 30 inches long. If you have 2x4's underneath, going perpendicular to the tank, (and to the stand) you'll have ~nine 2x4's under 290 pounds of weight. That's ~32 pounds per 2x4. That's really not a problem, even if the tank is dead center over the 2x4's, which it probably wouldn't be anyway.
The other tanks have different dimensions, but importantly are not nearly as tall as a 29, so the load per 2x4 is smaller still.
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Yeah it's roughly 2.5cm. I'm just a little worried about the 30g tank. I'm thinking it would have to be side on so both beams support the weight but it would over hang by a bit.
Side on side it shouldn't overlap. Tank should be 76.2 cm versus 79 cm. Unless, you have a 30 gallon (91 cm), not a 29 gallon (76 cm.)
But I see and share your concern lengthwise. It's important to be comfortable with it. I suggest asking around with more people on the precise way to support the tank lengthwise.
2x4's placed vertically would hold a tremendous amount of weight over a span of 79 cm.
Even horizontally, (under 1/2" plywood), but I can't find the metric for exactly how much of a dead load it would support. No need to try it unless you have certainty it's no issue.
But I see and share your concern lengthwise. It's important to be comfortable with it. I suggest asking around with more people on the precise way to support the tank lengthwise.
2x4's placed vertically would hold a tremendous amount of weight over a span of 79 cm.
Even horizontally, (under 1/2" plywood), but I can't find the metric for exactly how much of a dead load it would support. No need to try it unless you have certainty it's no issue.
I might pick up a couple of these http://wholesalesuperstore.com.au/r...ries/pallet-racking-support-bar/prod_238.html
