Furnished content.
(from Lumberjocks.com)
One of my sons-in-law recently outfitted his basement with a workout room. He was able to buy the bag for a reasonable price but the mounts were several hundred dollars for something that would hold up.I had a 10ft.+ length of 5/4 X 9 oak laying around so I cut, jointed, planed, and glued up 2, 26” blanks.Glued the blanks together with the grain at 90 degrees to each other to minimize the chances of it splitting from repeated banging and finished it round with a jig on the router table. It finished up at 24” diameter X 2” thick.Made the brackets from a 4' piece of perf. angle iron and 2 ft. of 1/8 X 2” steel strip.To mount the frame to the platform I inserted 6 threaded inserts and attached the frame with 5/16-18 hex head bolts. It's rock solid with no bounce at all.