I've got my heart set on hiking Guadalupe Mountains National Park with my oldest son sometime. But, it's steep and rocky, and trekking poles are highly recommended. The closest thing I had was a pair of bamboo canes I cut 2-3 years ago, but they're way overbuilt and heavy, have only tape wrapped around the feet to keep them from splitting, have only tape for handles, and don't have wrist straps. I decided to try again and make a better pair.
I started combing the internet for info about working with bamboo and making trekking poles, and I pieced together a plan from many different sources. I even had an original idea or 2 if you can believe it, which doesn't happen often
SIDE NOTE: I had never considered the type of cane that's native to North America to be true bamboo. Instead, I reserved the word "bamboo" for varieties from the far East and called the local stuff only "cane". I don't know where I got this idea, but in the course of my research, I found out that it is in fact a true variety of bamboo.
Okay, back to the program. I found this video
to be the single most helpful source of information. Heat treating the bamboo drives out moisture, making it lighter, and supposedly caramelizes the sugars, bonding the fibers together like fiberglass. There were other ideas I borrowed from other sources, but I don't remember what the sources were.
The first step was to find two straight stalks the right size, as green as possible and do a quick rough cut to the approximate dimensions. I left them a good 8-12 inches long so I could move my grip up when hiking downhill.
I then worked on one at a time so I could experiment with different techniques. I carefully cut the first one down to final dimensions with a small hand saw. I saw a picture online somewhere of a professionally made bamboo cane that had all the nodes sanded smooth. They still curved out organically, but there were no sharp edges on it. I really liked the look of it, so I decided to sand the ridges off of the nodes on mine. I was careful not to sand down too far though, because most of the strength is in the tough outer layers. The further in you go, the softer and less dense it gets.
I then drilled a tiny hole in each section to let steam pressure out and heat treated it over my kitchen stove. I didn't have the technique and pace quite right, so the color turned out uneven. I even burned a couple of spots, but it wasn't too bad. The unsanded parts mostly came out a nice golden/bronze color. Unfortunately the sanded parts didn't match the rest at all.
After it sat indoors and dried out for a few days, I started work on the foot. I'd looked at a lot of different commercial options, chair tips, walking cane feet, crutch feet, trekking pole tips, and some of them were fairly inexpensive, but then a light bulb went on. People repair their shoe soles with Shoe Goo, and its cheap and widely available, so why not use Shoe Goo to build up perfectly fitting shoes for my trekking poles? I applied the goo to the shank part of the pole by hand and hung it up to cure. Once it was solid enough to work with, I wrapped a strip of paper around it to make a form for the bottom portion of the foot. I turned the whole thing upside down and poured in enough goo to make it about 1/8 - 1/4 inch thick. Of course, the part of the paper that touched the goo got glued to it, so when I pulled off the form, a bit of the paper ripped off and stayed stuck to the newly formed foot. It looks awful, and the foot itself isn't uniform, but it will hopefully work well, and it's extremely light. I'd had grand ideas of making a nice perfectly shaped form for the entire thing before I got started, but I never did figure out how. Thankfully when the pole is turned upright, the foot is barely noticeable.
The next step was to work on the handle area. The guy in the video used grip tape IIRC, but I've come to the conclusion from everything I've read about trekking poles, that grips really aren't as important with proper wrist straps. So I decided to forego any kind of wrap and instead focus on wrist straps. I used a loop of cord to make a prussik knot so I could slide it up and down the pole to adjust the wrist strap height. I then cut a short length of mule tape that someone gave me and tied that to the prussik knot. This is the part that goes around your wrist.
The process on the second pole was pretty much the same, except that I decided not to sand down the nodes and I got the heat treating a lot more even. As much as I like the idea of the whole thing being smooth, I'll live with the ridges if it means a more consistent color.
I also decided to weigh it at every step. However, after heat treating, the poles continue to dry out and lose more weight over the course of days and weeks, so it's hard to know how much the feet and wrist straps really weigh. I couldn't just weigh before and after adding the feet and assume the difference was the weight of the feet, because the poles themselves lost weight in the meantime. I'm not at home, and I don't have the weights with me, but I remember the first one came out to 175 grams (6.2 ounces) finished. I'll post the rest of the weights when I have them.
I was really surprised and pleased that it turned out that light, but the second one is over 2 ounces heavier, and I don't know why. There's a few possibilities:
- Invisible differences in the bamboo stalks themselves
- Sanding the first pole allowed it to dry out more
- My uneven heat treat technique on the first pole actually worked better
I feel like the sanding was probably the biggest difference. I want to make another pair for my son, so I'll try sanding down the entire outside surface of one before heat treating and see how the weight turns out.
EDIT: Here are the final weights.
Trimmed:? Heated:179g Shoed:175g Handled:178g
Trimmed:349g Heated:266-234g Shoed:265-234g Handled:235g
The reason for the ranges is that I weighed it on different days as it was drying out.