Coupon bender

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Does anyone know of any plans to build a coupon bender for plate or pipe. I don't have a press and don't want to drill holes in my garage floor to mount a  compact bender. In my old school they had a coupon bender on a table that you pumped. If anyone knows can you please share info with me as I want to bend test my welds.Miller Maxstar 200 SDPiperliner #10 Gold
Reply:I think someone posted up one in the past. All they basically are is a miniaturized version of a shop press, but the jack is mounted on the bottom, not the top. http://weldingweb.com/vbb/showthread.php?t=45682I know I've seen plans for one somewhere, but I'm not on that computer right now..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Originally Posted by DSWI think someone posted up one in the past. All they basically are is a miniaturized version of a shop press, but the jack is mounted on the bottom, not the top. http://weldingweb.com/vbb/showthread.php?t=45682I know I've seen plans for one somewhere, but I'm not on that computer right now.
Reply:Yes.   ..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Originally Posted by smilexelectricDoes anyone know of any plans to build a coupon bender for plate or pipe. I don't have a press and don't want to drill holes in my garage floor to mount a  compact bender. In my old school they had a coupon bender on a table that you pumped. If anyone knows can you please share info with me as I want to bend test my welds.
Reply:Originally Posted by B_CWhy............
Reply:Originally Posted by 7A749You can do it like CEP does
Reply:You can tell a lot about a weld by doing a fillet weld break test. Attached ImagesDon’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Using a BFH is certainly satisfying.
Reply:I found this years ago, looks simple enough to build. Attached ImagesDon’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Most if not all of the certifying orginizations have their own requirements for coupon testing as well as diagrams for the actual testing apparatus.AWS, ASME each have their own as does the American Bureau of Shipping (ABS). I deal with the last quite a bit and the diagram for theirs is available free online. the link is  http://www.eagle.org/eagleExternalPo...ent/Part2_2013.page 284 of 400.All of the orginizations are very particular about the tolerances for their rigs, and the sizes and orientations of the test speciments both during the weld test and when the coupons are machined for testing. ABS even specifies the direction of the plates rolled axis.Power for the plunger can be anything as simple as a bottle jack, or as complicated asyou want to go including hydraulic power units.I know of one shipyard that  utilizes a Harbor freight "tubing bender" that has the plunger and receiver set-up in it and it has worked for years.While I have used the use the big hammer, it is better to use a slow steady application of force to get the best and clearest test results.
Reply:Originally Posted by CEPI found this years ago, looks simple enough to build.
Reply:http://weldingweb.com/vbb/showthread.php?t=52895TO INVENT  YOU NEED A GOOD IMAGINATION  AND A  PILE OF JUNK'' - THOMAS EDISONMost Of The Time People Don't see The Quality of a Good Job Unitl they see a Bad Job !! -Scott Esplin
Reply:Originally Posted by smilexelectricAll I would need are some dimensions.
Reply:Lets try again....No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Originally Posted by DSWLets try again...
Reply:Hmmmmm, I suppose if you have a regular welding bench with a fairly thick top, you could drill and tap 3 holes in it to attach two rollers and a fulcrum point for a long lever to move a third roller......horizontally.This way you only have to have the rollers ready to bolt to the bench for when you want to do a test and just bolt them to the work top.....the long lever would apply enough force to bend 9mm thick steel plate if the lever was about 4 metres long and you had enough space for the swing.Having a test rig like that, at a moments notice you could test anyone who applied for a job by setting it up in a few minutes while they welded a test piece, also precut and ready to go.......no need for an elaborate hydraulic thingy costing an arm and a leg.If the bench is too mobile for side force, you could mount it on a plate, welded to the side of the bench leg and all the force would be down to the floor.How many tons of force would you need to bend a 9mm thick plate 50mm wide into a horseshoe shape?.....that determines the fulcrum point of the lever and it's length when you apply 50kg's to the lever end........but I think in the end most people would want to use a hydraulic jack method or the shop press. Ian.