Introduction: Hot Pipe Wood Bending
I've always been intrigued by bent wood. However, I can't afford a steamer nor do I have space to store a steam box. I came across this technique in an old issue of American Woodworker (now shared online here). Instead of placing your wood inside a steam box, you soak your wood overnight then create steam inside the wood by the use of a heated pipe. It's a quick process that produces surprisingly great results.
If your already have a torch and scrap wood, you have 90% of the required materials for this hot pipe bending jig.
Step 1: Tools and Materials
Step 2: Remove Pant From Pipe
Using some sandpaper remove the paint from the black iron pipe. To be safe, I'd suggest not using galvanized pipe for this application as if it is heated too hot, it can release toxic fumes. For this process your pipe should never get hot enough to produce these toxic fumes; but again, just to be safe.
Step 3: Create Torch Rest
Cut pieces for the torch rest from scrap wood. I had some old MDF tha had been run over by my car (notice the tire marks). Secure the supports in place with screws.
Step 4: Cut Front Support and Position Hole
Cut a hole in the center of the front board two inches from the top. This will be where the end of your torch comes through. Position the front and secure in place.
Step 5: Attach Flange and Pipe
Using machine screws and t-nuts, attach the flange in place. I opted for this instead of wood screws because I didn't want them to tear out over time. I was missing one t-nut but I will add that in place later.
Step 6: PVC Torch Clip
Cut a ring from a piece of 4 in. PVC. Cut about one fourth of the ring away. Cut the profile on a piece of scrap wood that fits in between the supports then attach it to the jig with screws.
Step 7: Setup
Clamp the jig to your workbench, you don't want a hot pipe and torch to fall or move while using it.
You want the temperature to be as low as it can be with propane. The flame should just be coming out the end of the pipe as shown in the second picture. If it's loud and shooting straight out the end of the pipe, it's going to be too hot and will burn the wood.
Step 8: Bend Wood
Soak the piece of wood you are interested in bending overnight. I haven't tried anything over about 1/8 in. thick. Press the wood against the hot pipe. After a few seconds you should feel the wood weaken and start bending. Remove the wood from the pipe every 5-10 seconds and dip or spray the wood with water. This will introduce more moisture in the wood and keep it from burning. Bend the wood to whatever shape you like or need. I bend this piece of walnut into two loops. I was surprised at the ease and efficacy of this process.
What bent wood projects have you created? Have you tried hot pipe bending before? Share your stories in the comments!
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Please be positive and constructive.
you might use an bicycle water bottle holder in place of the PVC. They are readily available in metal or plastic, and frequently discarded or found for free at local bike shops
With the flame shooting right through the tube, isn't most of your heat going to go out the end of the pipe? Have you given any thought to making this more efficient or is that unnecessary?
A suggestion might be to put a cap on the end of the tube, yet drill some tiny vent holes on the underside of the tube, to let vapors escape.
You could cap off the end, but I'd be worried about where the burt gas is going. Along with that, you don't want to keep all the heat from the torch as propane with a blue flame can get upwards of 2000 degrees F and that's too hot for this purpose.
What is the tightest bend you can make
It would be the radius of the pipe being used. I'm not sure what the limitations of the wood are however.
First....excellent project! I have an idea for an art piece that requires, for ease of explanation, a series of slats bent into shape and attached to a flat piece of wood, to resemble a rib cage. This appears to be just what I was looking for, because I, too, didn't want to invest in, nor store, a steamer.
My questions are....
- Has anyone tried thicker wood? I could try myself, obviously, but I find a lot of value in learning from others...or their mistakes. :)
- I guess
- Has anyone tried using thicker wood? I guess I could find out for myself, but learning from others (or even their mistakes) has a lot of value.
- I guess that, if a wood as hard as maple bent that well, softer species would be at least as easy? I've never steamed wood, so I don't have the answer at hand.
- Are heavy gloves a good idea for handling the wood while working it?
Again, thanks a lot for this great idea!!
I haven't tried anything thicker than about 1/8 in. so I can't say how well it would work for thicker woods.
I didn't use gloves and you shouldn't need any unless you are afraid you might touch the pipe.
I've only ever bent walnut with this so I can't say what the efficacy with other woods would be.
FIrst...yes, I know it was walnut, and not maple.
Second...sorry about the formatting error. The scrolling of this page leaves a little to be desired.