Curved washer for 1.5-inch abs pipe

thingiverse

This is a set of curved washers for a 1/4" bolt in 1.5" abs ;pipe. I made this to secure an eye bolt, for attaching a rod holder to my float tube. The inside washer has a hex recess for a 1/4" nylock nut which is press-fit into place. For a really secure install, drill a 1/4" hole in the pipe where you want the bolt or eye bolt to go, and then assemble the curved washers, the metal washers, and the nuts. The sequence from inside-out is 1/4" nyloc nut, curved inside washer, pipe, curved outside washer, 1"OD 1/4"ID fender washer, 1/4" lock washer, 1/4" nut. For an eye bolt, the final 1/4" lock washer and nut can be omitted. Now loosen everything up so that you can access the curved face of the inside washer. Put ABS pipe cement on that and on the pipe where that washer lands. Tighten everything up again and let the cement set. The result is a captured inside washer and nut, so that you can install or change or remove the bolt from the outside even after you no longer have access the inside. Print this in ABS if you want to glue it to the pipe, with 100% infill, no raft, no support, 0.25mm layer height is fine.. Position the flat sides of the washers down on the build plate. This design was done on Onshape.com, and if you are a registered Onshape user you can copy this and modify it. The design is parametric - look for the variables at the start of the build list on the left side of the design window. The link to the design at Onshape.com is https://cad.onshape.com/documents/45cf077857a1f613ee4b029e/w/a99e8f3fe93e16a5eff12017/e/05d757a37420cf260b25ef5a Onshape provides free licenses to hobbyists and educators.