Bear in mind that the dimensions of this bench will not be suitable for everybody; it will depend on the height of the person using the weight bench. The bench is about 3.75 feet long which is an average size.
The Bench plan can be viewed/downloaded here>>> Weight Bench Plan/Drawing To download a copy, right click then "Save Target As" then hit "Save".
NOTE: This built is not designed for serious heavy weight lifting.
Materials you need:
4 ft. of 3/4 x 12 piece of plywood or solid wood
3 ft. of 1 x 2 wood
8 ft. of 2 x 2 wood
8 ft. of 4 x 4 wood post
1 (#10) 8" bolt and nut
2 (#8) 3" bolt and nuts
1 (#10) 12" bolt/screw and 4 bolt nuts
8 (#10) nylon washers
14 (#10) flat washers
4-3 inch long lag screws
4 rubber or rubberized feet
Some nails and wood glue
Wood stain and Polyurethane protective sealant (Optional)
Tools you need:
Circular saw
Miter saw (optional)
Power drill with drill bits, Forstner bit and the like (used to counter sink lag screws)
Wood chisel
Socket wrench/ pliers
Hammer
Sander or Sand paper
Pictured below is the finished weight bench.
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This built is not intended for heavy lifting, maybe I should put that as a warning in the instruction. For really heavy lifting it's a lot safer just to buy one, they are made of metal and could take an abuse.
I usually just use dumbels maybe 60-100 lbs. the most. I've been using this for at least a year and half now with no problem.
For slipping -off the seat, I guess it depends on what you are wearing :), otherwise it's ok. I've even upgraded it; I covered the seat/back with foam (for comfort) and bar on the leg so I do can seat-ups. If you go this route, maybe just use a cheap plywood for the seat.
Below is the upgraded version. It was raining last night so it got wet...again.
I hope you will answer this quick, cause im in a hurry :-)
Do you think this bench would be rock solid if you forget about the 5 positions and just add one board so it's just a flat bench? I think the lower part of the construction seems solid but the upper seems more fragile... what do u think, do you think I could lift heavy weight if I just add one piece of wood instead so its not adjustable but only flat. NIce work by the way! ;)
I used it more as a patio bench than a weight bench now, lol.
http://www.home-gym-bodybuilding.com/homemade-weight-lifting-bench.html
http://www.home-gym-bodybuilding.com/homemade-power-rack.html