We left Punta Cana at 6:45 and got home at 7:30(19:30). We brought our own snorkeling gear and saw sooo many HUGE starfish, an eel, lots of colorful fish, and a pretty big crab. We had an amazingly delicious authentic meal on the ranch. Even holding hands for the little ones while making the long track on the stairs to the waterfall. Our guides were amazing! They helped with everything. Each handler is allowed 1 person, 3 times per week, on their horse(what we we told) Their horse is their everything! You will see when you drive up there and once you get there. I read lots of reviews about the horse and wanted state i felt the same at first until I realized that each horse was owned by the handler, not the ranch. Jesus was our guide and Pina our driver.īring $ for tipping and on the way there and back, we stopped to use the restroom and shop a little. when you cold work steel it increases the physical properties (makes it stronger).We went with Road Runners and they operated perfectly. DOM does report it and it is usually 30-60 percent higher than ERW because it is "cold worked" when it's drawn over the mandrel and through the die. ERW does not even report yield and tensile. And he is leaving out the most important reason you use DOM over ERW its the yield and tensile strength. 'Daniel Nerf is not entirely correct referring to DOM vs ERW. Oh, from one of the plans I purchased from you I have redesigned it in to a fully independent suspension Trike frame. Hope this helps, best wishes and keep building. Now, if you want perfectly round dimensional tubing with extremely tight tolerances you buy DOM and pay a premium, or you can buy ERW which has a minute less tolerances than DOM and save a bunch of cash and of course you have to sand the seam.īoth DOM and ERW have a seem, don't kid yourself ! and both can split during bending but not likely.Īlso the differences in tolerance between DOM and ERW are so negligible that if you were sand the outside of both tubes you would never know the difference. (Sorry Luke, I do not know the Metric conversion for this Grade, you could ask your local engineer - in reference to Lukes commentary on our DOM tubing article.)īoth ERW and DOM in this Grade specification has a 50ksi minimum yield rating (50,000 psi). When you buy your tubing (In the USA) you need to tell them you want ASTM A513 tubing in either DOM or ERW. Hi, I'm Daniel Nerf, I am an Engineer here in Dallas Texas. Says Daniel Nerf, "I can solve all the issues of DOM versus ERW." The image and diagram is courtesy of the fabricator. DOM, although made the same way has the additional process of being drawing and the mandrel removes this seam and provides a nice smooth surface on the inside of the tube. Finite Element Analysis (FEA) conducted by a qualified engineer can provide you with correct tube diameters and wall thickness that can be replaced for your specific frame design.ĮRW has the weld seam on the inside of the tube (see image above). Each frame has a different geometry and different loads that will bend and twist the steel in various ways. The advantage here is that you can reduce your frame weight by making such a change. It is very critical to confirm that it is ok to make this kind of change on your frame. For example, you can replace a 1 1/2" ERW tube with a 1 1/8" DOM or Chrome-Moly tube. You can take advantage of this by replacing a larger diameter tube with a smaller diameter tube of stronger material. ![]() All three, Chrome-Moly, DOM and ERW tubing weigh about the same but it is important to note that Chrome-Moly is the strongest, followed by DOM and finally ERW being the weakest of the three.
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