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#1
posted to rec.boats.building
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Bending Mahogany
I made up a 10 ft length of 4" plastic pipe with the end cap cemented on one
end, the other end is removable. I have put various species of wood in it, filling it with water and let it soak prior to bending the wood. It work well. I have not tried bending mahogany using this method. I need to bend two pieces of 1 X 3/8ths mahogany for seat rails in a lap strake dinghy. Just spent $38 on the mahogany right after trying to bend other pieces dry only to break them. Does anyone have an opinion? Don Dando |
#2
posted to rec.boats.building
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Bending Mahogany
On Fri, 07 Dec 2007 02:04:33 GMT, "Don Dando"
wrote: I made up a 10 ft length of 4" plastic pipe with the end cap cemented on one end, the other end is removable. I have put various species of wood in it, filling it with water and let it soak prior to bending the wood. It work well. I have not tried bending mahogany using this method. I need to bend two pieces of 1 X 3/8ths mahogany for seat rails in a lap strake dinghy. Just spent $38 on the mahogany right after trying to bend other pieces dry only to break them. Does anyone have an opinion? Only a note that wood is usually softened with steam in order to bend it. That way the wood doesn't absorb a lot of water. There are books. There is this magazine, Wooden Boat, that is devoted to that kind of thing. I do prefer aluminum myself, as a boat building material. It is easy to drill and rivet, and doesn't need paint. Maybe antifouling bottom paint, but it doesn't need to be protected from sea water. Casady |
#3
posted to rec.boats.building
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Bending Mahogany
On Dec 6, 9:04 pm, "Don Dando" wrote:
I made up a 10 ft length of 4" plastic pipe with the end cap cemented on one end, the other end is removable. I have put various species of wood in it, filling it with water and let it soak prior to bending the wood. It work well. I have not tried bending mahogany using this method. I need to bend two pieces of 1 X 3/8ths mahogany for seat rails in a lap strake dinghy. Just spent $38 on the mahogany right after trying to bend other pieces dry only to break them. Does anyone have an opinion? Don Dando Clear mahogany can be bent nicely with steam. Be careful not to oversteam or it will tear, under, it will split out. I trust you are talking about real mahogany and not that crap they sell for decking. Anyway, as to soaking first I suppose you can however, if you steam it properly you should not have to. Any water that does soak into the wood only serves to help move heat through the part, as heat is what makes the wood cell walls soft, not moisture or steam. Steam just serves to carry the heat as it were. Anyway, proper steam application should make it so you don't need to presoak, at the same time, I see no problem with it either, just extra steps... I would try a test piece first, but 15 min per 1/4" is a good starting point iirc, hopefully someone will correct me if I am wrong on that one. Later, good luck, post pics. I will see if I can dig up some pics of my turkey frier steamer, I have several size steamboxes I can hook up to it. |
#4
posted to rec.boats.building
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Bending Mahogany
I have used castoff aluminium guttering to heat / steam wood. By
folding the ends up just so to retain the water and using two pieces, one as a lid, sitting on a couple of camp stoves, I was able to boil teak. Then I found out that teak does not benefit from steaming. Still, the method was satisfactory in principal. Terry K |
#5
posted to rec.boats.building
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Bending Mahogany
On Dec 7, 8:23 am, Terry K wrote:
I have used castoff aluminium guttering to heat / steam wood. By folding the ends up just so to retain the water and using two pieces, one as a lid, sitting on a couple of camp stoves, I was able to boil teak. Then I found out that teak does not benefit from steaming. Still, the method was satisfactory in principal. Terry K I would imagine any of several problems with your setup made it fail, not the wood... |
#6
posted to rec.boats.building
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Bending Mahogany
On Dec 7, 8:23 am, Terry K wrote:
I have used castoff aluminium guttering to heat / steam wood. By folding the ends up just so to retain the water and using two pieces, one as a lid, sitting on a couple of camp stoves, I was able to boil teak. Then I found out that teak does not benefit from steaming. Still, the method was satisfactory in principal. Terry K Let me explain my last post. I do not think you method was satisfactory in principal. Heat makes the wood cell walls soft so they can be bent, but only once. Once the wall is heated soft, if the temperature drops, even for a few seconds, it will harden, and once that happens that's it, it will not resoften. Aluminum, with water, on heating elements screams uneven heat to me. The water around the elements will be a different temp than the surrounding water, aluminum sheds heat so fast, there is probably no way to keep an even temp throughout the box. As the different areas heat and cool, you lose the ablility to get any benefit from the steam by the time you pull it from the steam box. I could be wrong, but I do not think your method was satisfactory in principal, Just my opinion. All of my steam boxes are 3/4 inch wood panels. I drill a 1 inch hole in the end and put a rag in to keep the steam box full and moving... |
#7
posted to rec.boats.building
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Bending Mahogany
"Terry K" wrote in message ... I have used castoff aluminium guttering to heat / steam wood. By folding the ends up just so to retain the water and using two pieces, one as a lid, sitting on a couple of camp stoves, I was able to boil teak. Then I found out that teak does not benefit from steaming. Still, the method was satisfactory in principal. Terry K Teak certainly benefits from steaming, if your purpose is to bend the teak. I have steam bent teak for rails, frames, inwales gunwales etc. for my lapstrake boats. Most wood will take steam better if it is not kiln dried. ...Ken |
#8
posted to rec.boats.building
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Bending Mahogany
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#9
posted to rec.boats.building
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Bending Mahogany
"Don Dando" wrote in message . net... I made up a 10 ft length of 4" plastic pipe with the end cap cemented on one end, the other end is removable. I have put various species of wood in it, filling it with water and let it soak prior to bending the wood. It work well. I have not tried bending mahogany using this method. I need to bend two pieces of 1 X 3/8ths mahogany for seat rails in a lap strake dinghy. Just spent $38 on the mahogany right after trying to bend other pieces dry only to break them. Does anyone have an opinion? Don Dando My first question to you is what specie of mahogany are you trying to bend? When we build the 17' runabout we needed to make the 1/2" African Mahogany planks more supple where we had to roll around the barrelback of the hull. I used a 30Ga garbage can with a drain valve in the bottom to make it easier to drain. I wrapped the can with some close cell neoprene for insulation and cut a flap door in the top. we filled the can with 180 degree water, placed the end we needed to bend into the water, wrapped a towel around two feet above the can, wrapped plastic around that with the bottom of the plastic tucked into the can so water would return to the can and used a quart container to take hot water and pour it down the upper section of the plank. All you need is about fifteen to twenty minutes in the soak. Have all your clamps staged and ready. We used the towel to wrap the plank in transit to the hull to maintain temperature as best as possible. After you have clamped it in place use a heavy duty heat gun, such as you would use to strip pain, and apply heat to both side of the plank for about ten minutes. This not only dry the wood but helps set the bend/twist needed. We left the boards clamped for twenty-four hours the sanded the inside to remove the raised grain, completed the fitting of the plank and installed it. We also used this method in a 4" PVC pipe to bend the shear clamp. My experiance, hope this helps. Tom |
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