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#1
posted to rec.boats.building
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Bending SS Tubing
Anyone in this group had any experience bending SS tubing? I can do
basic welding of SS but am fuzzy on bending procedures. A couple of tricks I have heard involve packing the tubing with sand and construcing a wooden die to form the tubing. I can visualize construcing a wooden form to do the bending but I can not visualize how to force the tube around the form. Perhaps one could use a come along? Suggestions appreciated. Joe |
#2
posted to rec.boats.building
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Bending SS Tubing
Joe,
You neglected to include three IMPORTANT pieces of information: What is the diameter of the tubing you plan to bend? What is the wall thickness of said tubing? What is the smallest radius you plan to bend said tubing to? These are all things that need to be considered. Matt Colie Joe Bleau wrote: Anyone in this group had any experience bending SS tubing? I can do basic welding of SS but am fuzzy on bending procedures. A couple of tricks I have heard involve packing the tubing with sand and construcing a wooden die to form the tubing. I can visualize construcing a wooden form to do the bending but I can not visualize how to force the tube around the form. Perhaps one could use a come along? Suggestions appreciated. Joe |
#3
posted to rec.boats.building
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Bending SS Tubing
If you are talking about 7/8 & 1" stainless for pulpits you better find
someone with the right equipment or you will end up with a lot of expensive junk. Sand packing works OK on softer material but is not really going to help with stainless and 1" tube on anything under a 12" radius will require hydraulics or a looong lever handle. Bending polished stainless tube with decent results requires a set of polished dies built to exact diameters. I built a couple of benders, a roll bender for long sweeps and a hydraulic for the tight ones. http://www.rutuonline.com/html/tube_benders.html You can get plans and dies he http://www.pro-tools.com/200k.htm . A set of dies for 1" tube costs about $180. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "Joe Bleau" wrote in message ... Anyone in this group had any experience bending SS tubing? I can do basic welding of SS but am fuzzy on bending procedures. A couple of tricks I have heard involve packing the tubing with sand and construcing a wooden die to form the tubing. I can visualize construcing a wooden form to do the bending but I can not visualize how to force the tube around the form. Perhaps one could use a come along? Suggestions appreciated. Joe |
#4
posted to rec.boats.building
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Bending SS Tubing
Glenn--
I am with you. Here is my problem. My boat is in the Fla. Keys. I have tried everywhere to find a shop to do this for me. The last guy took a deposit and then kept me waiting for months. He just returned the deposit saying that he was too busy to do the job. If I am going to get it done I am going to have to do it myself. I have thought that I might try to form it exactly with something like EMT and then take it as a model to a shop in Miami to do the job. No hoe of getting it done here in the Keys where most all of the trades have been driven out by the cost of living. Also, there is a disease down here known as "Keys disease." The syptoms are chronic laziness and the abandonment of all work ethic. It's always been difficult to get anything done here and the 200 per cent increase in property values in the last four years has done nothing to alleviate the situation. On Sat, 25 Mar 2006 20:08:32 -0500, "Glenn Ashmore" wrote: If you are talking about 7/8 & 1" stainless for pulpits you better find someone with the right equipment or you will end up with a lot of expensive junk. Sand packing works OK on softer material but is not really going to help with stainless and 1" tube on anything under a 12" radius will require hydraulics or a looong lever handle. Bending polished stainless tube with decent results requires a set of polished dies built to exact diameters. I built a couple of benders, a roll bender for long sweeps and a hydraulic for the tight ones. http://www.rutuonline.com/html/tube_benders.html You can get plans and dies he http://www.pro-tools.com/200k.htm . A set of dies for 1" tube costs about $180. |
#5
posted to rec.boats.building
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Bending SS Tubing
OK Joe,
Now we have enough information to be serious help (been there-done that-didn't buy the picture and the Tshirt has worn out). To successfully get a pulpit made with out the boat handy you need: A ridged model of the desired shape (you are planning that), and An Exact replica of the deck (or whatever you expect to fasten it to. The first item you do seem to understand, yes, thin wall EMT will work just fine but the bender does a smaller radius than you will want. So, you dummy it up by making a bunch of partial bends separated buy a little distance. There are no T's available for EMT, so you screw hubs into a pipe T (yeah, it looks like hell, but it serves and it is less kluncky than using a jake). Next, to create the replica of the deck is interesting. Most decks are cambered and nothing is square, flat, straight,vertical or horizontal. You can effectively measure the camber of a deck by putting largish dowels under a 2*4 so that they contact the deck at the mount locations and then measure and record the separation and between the straight edge and the deck. I have had success duplicating this by taking a heavy piece of plywood (3/4) and a light piece (1/4). Planing (a belt sander will work) the edges of the light ply then clamping it down at the edges with battens under it, to make the separation match what you measured. This need to be glued when you are sure it is right. I do hope I didn't loose you along that track. If I did, I will gladdly try again. Now that you have a model of the deck it will fasten to and a model of the rail, you can go find a fabricator on the mainland. Just be sure that he has done this sort of thing before, or he will screw it up on the first couple of trys and then charge you for the material used. Good luck Matt Colie Joe Bleau wrote: Glenn-- I am with you. Here is my problem. My boat is in the Fla. Keys. I have tried everywhere to find a shop to do this for me. The last guy took a deposit and then kept me waiting for months. He just returned the deposit saying that he was too busy to do the job. If I am going to get it done I am going to have to do it myself. I have thought that I might try to form it exactly with something like EMT and then take it as a model to a shop in Miami to do the job. No hoe of getting it done here in the Keys where most all of the trades have been driven out by the cost of living. Also, there is a disease down here known as "Keys disease." The syptoms are chronic laziness and the abandonment of all work ethic. It's always been difficult to get anything done here and the 200 per cent increase in property values in the last four years has done nothing to alleviate the situation. On Sat, 25 Mar 2006 20:08:32 -0500, "Glenn Ashmore" wrote: If you are talking about 7/8 & 1" stainless for pulpits you better find someone with the right equipment or you will end up with a lot of expensive junk. Sand packing works OK on softer material but is not really going to help with stainless and 1" tube on anything under a 12" radius will require hydraulics or a looong lever handle. Bending polished stainless tube with decent results requires a set of polished dies built to exact diameters. I built a couple of benders, a roll bender for long sweeps and a hydraulic for the tight ones. http://www.rutuonline.com/html/tube_benders.html You can get plans and dies he http://www.pro-tools.com/200k.htm . A set of dies for 1" tube costs about $180. |
#6
posted to rec.boats.building
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Bending SS Tubing
Your best bet is to take your measurements, a sketch of what you want done
and a lot of pictures to a fabricator in Miami if you want a good job done. Ace in Ft. Lauderdale does good work too. Most of them work in 304 tube though. You may have to provide the 316. yourself but OTOH they will probably be able to get a better price than you can. They can also TIG weld the joints which can be a lot more complicated to get right than the bending. Even at the price I paid it is not worth the risk of doing it yourself without the right equipment. My benders cost less than $400 to build but I have $20K worth of tools to build them with. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "Joe Bleau" wrote in message ... Glenn-- I am with you. Here is my problem. My boat is in the Fla. Keys. I have tried everywhere to find a shop to do this for me. The last guy took a deposit and then kept me waiting for months. He just returned the deposit saying that he was too busy to do the job. If I am going to get it done I am going to have to do it myself. I have thought that I might try to form it exactly with something like EMT and then take it as a model to a shop in Miami to do the job. No hoe of getting it done here in the Keys where most all of the trades have been driven out by the cost of living. Also, there is a disease down here known as "Keys disease." The syptoms are chronic laziness and the abandonment of all work ethic. It's always been difficult to get anything done here and the 200 per cent increase in property values in the last four years has done nothing to alleviate the situation. On Sat, 25 Mar 2006 20:08:32 -0500, "Glenn Ashmore" wrote: If you are talking about 7/8 & 1" stainless for pulpits you better find someone with the right equipment or you will end up with a lot of expensive junk. Sand packing works OK on softer material but is not really going to help with stainless and 1" tube on anything under a 12" radius will require hydraulics or a looong lever handle. Bending polished stainless tube with decent results requires a set of polished dies built to exact diameters. I built a couple of benders, a roll bender for long sweeps and a hydraulic for the tight ones. http://www.rutuonline.com/html/tube_benders.html You can get plans and dies he http://www.pro-tools.com/200k.htm . A set of dies for 1" tube costs about $180. |
#7
posted to rec.boats.building
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Bending SS Tubing
On Sat, 25 Mar 2006 15:41:38 -0500 Joe Bleau
) wrote: Anyone in this group had any experience bending SS tubing? I can do basic welding of SS but am fuzzy on bending procedures. A couple of tricks I have heard involve packing the tubing with sand and construcing a wooden die to form the tubing. The 25 mm dia, 1,5 mm thick tubes on this boat I bent myself http://www.home.zonnet.nl/whitehorse/ The corner with a fixed radius bender. After bending the corners I filled the tubes with "bird sand" and towed the tubes together. I can visualize construcing a wooden form to do the bending but I can not visualize how to force the tube around the form. Perhaps one could use a come along? You know stainless, though as hell, it has to bend more than the disired shape. Suggestions appreciated. Go to Glenn, I'm jalous on his bending machine. ;-) Good luck. -- Richard http://www.inter.nl.net/users/schnecke/catharina/ |
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