One of our students is working on a tripod leg solution of sorts. The support connects a mast with the chassis in a forward and downward direction, without co-planar surfaces or typical angles enabling 90 degree brackets. I told the student my guess for how to do this is a) figure out how to cut the ends of the supports so the edges mate with the mast and chassis planes, and then we’ll have to create some custom cut and bent brackets to connect things together given the odd angles.
Curious how experienced folks would approach this. Thanks
It should be noted there is nothing crazy with angles here, key is the mast is 90* to the lower surface (frame). So the top angle is just what it looks like from top down and bottom angle is just what it looks like from the side.
Depends on what your fabrication abilities are. Back in 2014 we had to do something very similar and we basically bolted plates to the upright and drive base, tack welded a tube between them and then took it off for full welding. These days our build space doesn’t allow welding, and even if it did we wouldn’t dream of tack welding something in place like that, so we would either find a different design that uses flat gussets, or do 3d printed ends in a high strength filament.
Tube nuts should in theory work with PVC, but note that the inside diameter (ID) of PVC is often non-standard. It’s also hard to say whether the PVC will be strong enough to keep the tube nuts from pulling out.
it is possible to do it with 1x angle and some brackets made of 1x or 1.5"x angle, w/o any precise angles, bends or twists.
On the mast attach your 1~2" long angle bracket. To start one bolt and leave it a little loose so you can just twist it. Looking at it from the side adjust it so that it points to the point on the chassis where you want it.
On the chassis again attach your angle bracket with one bolt and then looking at it directly from above twist it so it points to the bracket on the mast.
You now have two planes that are perpendicular to each other with their intersection being a line between the mast and chassis attachment points.
I know I’m replying far too late to assist the OP at this point, but since the thread got bumped…
One option is to use thin wall round tubing, then flatten the ends in a machine vice, and bend the resulting “tabs” you created to the proper angles. After that, drill a hole and bolt it to the existing structures.
Think this, but with another tab at a different angle on the other side to allow for the compound angle.
I really like this one & appreciate all the suggestions. Thanks, everybody.
What we ended up doing was run two 1/8th wall 2x1’s from front to back outside the bottoms of our 2x1 uprights that bear our arm shafts, bolted the uprights to them, and then added some .25" bar from the uprights diagonally down to the chassis level front-to-back tubes. Our design is fairly lightweight, and it seems like enough additional support so far.