Bifold door for my shop

[Frank S]

FrankS, I hope you post some details of the top track design. That looks to be an interesting challenge!

The top track is just the bottom flange of the 12" beam the door hangs and swivels from the 3/4" bolt a 3" long 1" pipe is welded vertically in the door frame with a loose sleeve bushing inside to take up space between the bolt and the pipe 2 hardened washers act as thrust bearings. the Head of the 3/4" bolt was turned down to a tapered flange so it would be flush with the top of the hanger plate which had a tapered hole I put a couple of tack welds just to prevent the bolt from turning making it serve as a fixed spindle. the door is held up with double nuts locked together on the spindle with the bottom nut being a nyloc nut as well. the top of the door hangs less than an inch and a quarter below the bottom of the Beams flange about as low profile as I could manage without welding the trolly sides together and doing away with the 5 bolts holding the 1 side on