Try this. Get some thin wall PVC thats a little larger diameter than your track pipe. Cut an 8" piece or so. Slit it the long way and remove a strip of material (lengthwise) sufficient to be able to collapse it enough to slip into the end of your track piece. You want 4-6" sticking out. Now, drill one or two holes near the end of the track piece and through your "connector". Countersink the holes slightly and secure with pop-rivets. (One end of every track section will have a permanent connector).
You'll notice that the connector tends to flair out/expand on its own. Squeeze the connector and slip it into your next track section. You'll be surprised at how well it holds the sections together. I've had them grip so well it took two people to get the track sections apart.
Preston-
Can you post a pic of this? I'm not getting it, but then, I'm not fully awake yet. Not sure I would grasp the process of tying my shoe right now.
Here are a couple of pics. Sounds like Walter has a good idea but I guess I'm not familiar with internal PVC pipe connectors, only external.
Anyway, in the top photo you can see how the "connector" naturally wants to expand. That's what helps hold the sections together. In the lower pic you can see the countersunk pop rivet that holds the connector securely to one end of the pipe section. It's on the opposite side of the slit.
Very good, thanks guys! The pics/plans helped a lot. I still have all my supplies sitting in my livingroom. Hopefully, I can do something with them this weekend.
I did a lot of experimenting on this for my book "Killer Camera Rigs That You Can Build". The best solution I've come up with is to get the thick wall PVC, 3/4". Take a 1/2" plumbing nipple (the short ones that have threads the entire length) and screw the nipple in the pvc. It's very tough at first, because the nipple is making threads in the PVC as you screw it in. Leave the nibble half-way out and screw on the other pvc. This makes a very tight seal and you don't get the bump at the joined section.
I'm working on Volume 2! Hopefully it will be ready for press by the end of summer. But it has to go through the beta builders first, and sometimes that can take a while. Volume 2 will have a motorized pan and tilt head, a full steadicam rig, a big dolly that uses tires, boom pole/with shock mount, and some other cool stuff. Thanks for the kind words about volume 1!