So I am building my own trainer/stand for my bike but I am hung up on one part. What is the official term for the part that attaches to the hex bolt on the rear wheel?
In the manuals/parts lists I have seen, Schwinn and Blackburn refer to the part that envelopes the ends of the axle or quick-release skewer as a "cone". Minoura refers to it as a "grommet" at the end of a "coupling".
I don't have a Cyclops manual handy. I also don't think there is an industry standard name for this part, as there is some variation between all manufacturers when it comes to the coupling/mounting mechanism of their trainers.
I'd expect it to be called a cup, or a socket.
If you're making this yourself, consider a 6 sided socket and then weld a length of the beefiest threadded rod that fits through the square drive hole. On the bike, use axle nuts instead of a QR and allow the minimum unsupported amount of rod. You'll probably be using a burner back wheel and tyre anyway, not your good one.
To stop the socket undoing the axle nut, don't thread it through the stand, use a longish tube with thick washers and two nuts on either side. Would be a bit fiddly to do up, but its going to be more stable.
Or simply run a longish bolt through the square socket hole and into the support. It needs to be free to rotate a little but not to spin.
How do you intend on adding resistance to the system?