DIY Adjustable height stool made of hardware store parts and 2x2s. Free plans from ana-white.com
1 - 2x2 @ 8 feet long
1 - piece of scrap plywood 6" x 6"
1 - 2x12 or 1x12 cut into a round circle (you can also buy a plywood round for a stool top at most hardware stores)
1 - 3/4" All-Thread 16" long (if you can't find 16" all-thead, you can cut it down easily with a jigsaw or handsaw with a blade designed to cut metal)
1 - 3/4" Floor Flange to match all thread (also recommend pipe thread tape for securing all-thread into the flange)
2 - bolts and washers to match the all-thread
2-1/2" pocket hole screws
3" screws or lag bolts (heads will be visible) for attaching cross supports to the legs
1 - 3/4" thick plywood, 6" x 6"
4 - 2x2 @ 15-1/2" long, long point to short point, both ends cut at 15 degrees off square, parallel to each other
4 - 2x2 @ 8-3/8" long, long point to long point, both ends cut at 15 degrees off square, ends NOT parallel to each other
Please read through the entire plan and all comments before beginning this project. It is also advisable to review the Getting Started Section. Take all necessary precautions to build safely and smartly. Work on a clean level surface, free of imperfections or debris. Always use straight boards. Check for square after each step. Always predrill holes before attaching with screws. Use glue with finish nails for a stronger hold. Wipe excess glue off bare wood for stained projects, as dried glue will not take stain. Be safe, have fun, and ask for help if you need it. Good luck!
Now this is the harder part of making this stool. There are easier ways but we felt that this was the right balance between difficulty and getting a nice looking project in the end.
Use either a tablesaw or circular saw to notch out the cross support pieces (note that you notch one on top and one on bottom), 3/4" deep. You can do this by making multiple cuts with saw blade set at 3/4" in the area to notch out, and then remove any excess material with a chisel.
Test the pieces to make sure they fit together.
It is always recommended to apply a test coat on a hidden area or scrap piece to ensure color evenness and adhesion. Use primer or wood conditioner as needed.