Updated with chain and eyebolts instead of hinges. Worked really well was very stable. Good Fitness. Very easy to assemble and disassemble and carry. Four separate beams and one chain and the wasteboard. Today it was roughly 2600mm by 4200mm, that could change depending on how you set it up.
Hinges were dangerous and tied it all together so that I had to carry all four beams at once. Replaced them with eyebolts
Rope stretches and I want to try to get it in a place where I would not have to recalibrate. Replaced it with chains
Cost is now in 2025 roughly 100 USD in hardware and chains Plus 40 for lumber and then whatever you are using for a waste board.
Seems strong enough to use in a vertical position will try it leaning against a wall later.
My parents came by and asked what it was…. .I was cheeky and said BDSM thing. With all of the calibration troubleshooting I was not lying. They are 80 but still laughed after an uncomfortable pause.
Materials
4 2x8 by 8’ lumber
8 5/16’’ by 4’’ eyebolts with about an inch eye.
16 Washers for eyebolts
8 5/16’’ nuts
4 1/4’’ 6’’ bolts to hold the chains
4 screw hooks or something for anchors
1 large bolt that fits inside the eyebolt eyes 6’’ long and nut
35 feet of chain I used 155lb load chain and turnbuckle Chain has to be large enough so that the 6” bolts can pass through the links.
1 turnbuckle
1 4x8’ osb sheathing for wasteboard. Could be cut in half
Tools
5/16 inch drill bit
1/4 in drill bit 6 inches of cutting distance long
1 in drill bit
1 1/4 in drill bit
Adjustable wrench
Wood rasp to flatten one side of drilled holes.
Hammer to encourage bolts
Carpenter’s square
Pencil
Measuring tape
Lots of long straight drilling sideways, a drill guide might help
The hardest part was lining up the eyebolts in each board so that each set of two (four inches apart) was stepped down by 1/4 inch from the set before so that they all would fit together stacked in the center. Picture below
I had to round the corners so that they would all fit with room to change the angle of the X
It is important to go through BOTH links when anchoring the corners for accuracy. Later I marked the links that I used with marker so that I could find them again.
