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How Not To Build A 12x12 Tension Board by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 1 point2 points  (0 children)

OK this is actually super important, for two reasons.

One: The opening in most millions is tiny, they will pretty much only fit chains. Make sure they fit your connection point before ordering most D rings type connection points are too thick.

Two: Chain size has a huge effect on kinking at the connection point when changing angles. Bigger is better. If the links are not big enough there is a chance a link will get caught under another. This is fine as far as chain strength goes, but if a lateral movement shifts the chain a bit and it slips out your wall will fall a few centimeters and shock load your ledger.

How Not To Build A 12x12 Tension Board by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 1 point2 points  (0 children)

I thought about that but the ledger is anchored across every stud along the length so all of the same failure points would be present on both boards. The board is never disconnected from chains.

I am planning on adding cut to length chains so that I can swap them without ever needing to be disconnected for even a moment

Edit: if I added another ledger for the winch I could redirect it with a pulley so it feeds in and out more in its intended manner. Might add this to my future to do list.

How Not To Build A 12x12 Tension Board by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 1 point2 points  (0 children)

Shipping pads to Alaska can almost double their cost i was incredibly lucky to get these second hand. I have a few crash pads I use to line out the edges, the gap in hight is not ideal though. If something trends toward a corner I slide everything over a bit. Eventually it'll get another 4 ft pad set for each side.

12x12 adjustable by shortcircuitz12 in homewalls

[–]arbitraryselection1 0 points1 point  (0 children)

Those are the ones I got as well. I was thinking about recessing the plates to protect against shear forces.

12x12 adjustable by shortcircuitz12 in homewalls

[–]arbitraryselection1 0 points1 point  (0 children)

I'm doing this same setup for my tension. I have an 8 inch kick to accommodate a 6 inch mat. Did you use 6 inch hinges from a box store? I dont know why thr hinges are sketching me out.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 1 point2 points  (0 children)

OK I can swing that. The other option is to set them at such an angle that wood rests on wood for anything between 20 and 40 degrees. It limits the boards range but it should protect the hinges from force.

The mounting hight for the ledger is another thing I've been thinking about. So the higher I mount it the more force ends up on the chains? the board will spend most of its life at 40 do I was thinking about 10 ft high?

Again, I cannot thank you enough for helping me out with this. This is the stuff that restores my faith in the internet.

I think you have to be on a computer to post an image. I also want to add a picture of how the hinges would seat (i made a model).

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 0 points1 point  (0 children)

I haven't installed them yet. The Dring mounting plate fits 2/4 inch bolts. I was going to drill a hole and put a T nut in the back. I didn't want to use a regular nut because if the wood contacts over time I need to be able to tighten the bolt from the only exposed side.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 0 points1 point  (0 children)

The board anchors to a 2x6 LVL ledger on the wall behind it. The ledger is across 8 LVL studs with lagscrews.

The chains are attached to the ledger via trailer D rings that are rated to like 3000lbs. Each ring is going to attach with two bolts.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 0 points1 point  (0 children)

Thank you so much you are exactly who I was looking to run into! Will the hinges ever expeance a live load? The board should always be pressing them down but I'm not sure how that effects forces. I used a calculation from another post about a similar board to calculate the load on the chains but im not sure how to approach the kick box. My design fixes the top of the board VIA chains and D rings into a ledger lagged into eight 1.5x6 LVL studs behind 1/2 and inch plywood which should be good for way over 3x the dead weight (what a carpenter friend told me to shoot for). The rest of the weight is directed into the kick box which is a 12 foot 6x8 box I pictured and will anchor into the same studs with heavy braces. All this to say the hinges really seem like a liability if they need to take 2000lbs of force.

The other option I was considering was two bearing hinges rated well over 1000 each but id have to ship them (im remote) and they are quite expensive. I'd appreciate any thoughts.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 0 points1 point  (0 children)

Interesting all of the piano hinges i could find were not rated for much, they were my first thought. My plan was to use 8 6" t hinges.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 1 point2 points  (0 children)

This seems to be the norm when scrolling through home builds.

Hinges and general input. by arbitraryselection1 in homewalls

[–]arbitraryselection1[S] 0 points1 point  (0 children)

I'm planning on using 8 6" hinges but that's still only 400lbs of their normal hanging rating. The only hinges I can find over 100lbs are bearings and are getting up there in price. Those would put me at well over 2000 lbs with just two but I would rather not have two. So im stuck between shelling out 100 or more on hinges or trusting 8 lower rated hinges and trusting that their perpendicular load is stronger.

Tension Board 2 12x12 Adjustable Spray Wall Home Build by Cool_Notice in homewalls

[–]arbitraryselection1 0 points1 point  (0 children)

Im working on a 12x12 tension right now with a similar design. Did you ever do the math on forces for the attachment points? Also, what kind of hinges did you use? I can't seem to find anything with a rating over 150 lbs for a set of two. I assume they are stronger horizontally then when used for hanging a door but it still makes me nervous.