I give a quick break down of how I made my pipes.
You can cut the corn cob to what ever length you want.
Then take a drill bit slightly smaller than the core of the cob. Drill to what ever depth you want but leave atleast a 1/4 inch from the bottom of the cob so that it wont get too hot while smoking.
Now stick a stick in the cob and mark how far down your bowl goes. now just drill a hole just above the bottom of the bowl for the stem to go into. I used a drill bit slightly smaller than the bamboo stem, then I slowly made the hole bigger until the bamboo fit tight. I did not use glue so I can pull my stem out and clean if I need to.
I had bamboo laying around but you can also buy a bamboo fishing pole at walmart for $8.
Cut it to what ever length you desire. If you cut a piece from between the joints you can skip the next step because the bamboo is hollow between the joints.
Then you will have to use a drill bit to drill holes were the joints of the bamboo are. I used a 10 inch drill bit $5 from lowes.
make a small diagonal cut at the end of the bamboo that goes into the bowl.
Now jam it into your pipe and smoke it.
This is not my video but its basically the same thing I did but I did not use any glue.
https://www.youtube.com/watch?v=iNxIQee7kes