![]() I used this detail in making it semi-portable instead of fully-welded.Īt first I was thinking "no way" but then ran numbers and it fits with equations. I haven't finalized a new parking spot yet but it could involve new mods. I had it straddling a 8'0" workbench until I finally reclaimed that space but apart from a few lifting jobs as years went by it sat more and more and that parking spot became important. ![]() Last thing I would advise is to locate the parking spot for the gantry before you build it. Tying the lower leg of the typical triangular lower structure is also important unless you have an extremely beefy center section. Some weak links are the swivel casters, the 4000# load isn't guaranteed to be in the center, potentially it could be trolleyed to either end and concentrate load, so those deserve some up-sizing rather than just 4000/4 = 1000# capacity. Relative to your pin, the 3/4" in double-shear sounds good. There are some great youtube videos, but I think for the size and length involved a bandfile (mini belt sander with 1/2" wide belt) would work well. ![]() The adjustable height is a good idea - were I to redo it that way I would try to carve out the welded seam from the tubing to get a better/closer sliding fit. Can also study Wallace catalogs they typically give you a beam height right there. pdf has some good info for generalized overhead hoist beam sizing. I have a 8'3" span using S6 x 12.5# for 2t working load.
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