[Madison]

Originally Posted by 114ManualLabor

We just used a 1/4 20 bolt. It held fine. The plate closest to the wheel was tapped, and 1/4inch thick. The other plate is not tapped. We only had to tighten the bolts once per competition: right before any final match. It's a wonderful setup. This variation is a bit heavy, due to two bearing blocks. I've since redesigned it to only need one frame rail, as well as only one bearing block.

This design, with two bearing blocks, yields a beastly solid frame, but at the cost of too much weight. The singe block design is much lighter, though less beefy.

Are you thinking of maybe using this design?

I've been working on something that incorporates a bolt for tensioning similarly to this -- the actual arrangement is quite different, but the theory is the same. Some folks on the team have expressed concern about the bolts backing themselves out, so I am just searching around for experiences with this type of system.

I've been working around a 3/8-16 bolt since it's going into plastic. Coarse, big threads are the order of the day for us.