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can some one help me  with  figureing how much  weight  i can  put on  a  6" channel on  edge ? 3/16  6' channel  contilevered on edge 15' such as  the end of  a  trailer past the rear  wheels. in other  words  how much weight to put on the  back half of trailer  if   front  half is loaded  equaly the  same  as  back half
Reply:15' is a lot of overhang for 6" channel. Otherwise unsupported, 6" 3/16 channel alone, cantilevered out 15 feet, won't hold didly. Not even without his guitar!  Seriously, I would question if there would be even 100lbs of static load capacity at the end of such a channel.With the deck in tension and braced from twisting, capacity would go way up, -exact calculations would be very complex- but still probably not enough for a 15' overhang on a typical flat trailer application.What kind of trailer? Any way to add taller sides?Did you check out the dandy truss system on Sandy's trailer build?http://weldingweb.com/vbb/showthread.php?t=30405Good LuckLast edited by denrep; 05-12-2009 at 12:13 PM.
Reply:denrep it was  a 40 foot mobile home  trailer i  want to  convert to a hay  hauler round bales  i cut 42' out  between hitche point and  tires  to make  equal lenths from  tires centersi am thinking to add 3x3' angle  to each side rail to  help  stiffin it up.it is  maybe  a lte  forties or  earlier model. guess i could  just  load and  test and   if  it  don't        work then make it  into something  else LOL  and  thanks  for  your  reply didnt think id  get  any
Reply:thought id  try  a new  aproach for  help enclose a  picture  and  see  what i can  find out.   sorry about my  cad  program Attached Images
Reply:Hey RetiredIW, I've been thinking about your project. The CAD drawing helps a lot.You could probably skip the angle bracing and "X " bracing, a trailer with a deck on it is not likely to "diamond" out of shape, and doesn't need X bracing. What you need most is more vertical material in the side rails. The material for any X would be of better use making the tongue a double height stack. I hope this paragraph makes sense.The added angle at the side rails is a good idea, but it would be better to stack it on the channel's web, rather than catching only the channel's flange edge. You probably really need a taller vertical side, or possibly some solution that would add a second piece on top in tension.FWIW - I worked on trying to help fix a problem with car carriers that held the end car out on about a 10'-12' cantilevered "beaver tail." The trailers were a spider web of tube construction, and the overhanging load of the end car would try to  practically tear the trailers apart.On the car carriers, there was not much  room for extra support, or changes, because the trailers were very low and the top deck had to drop over the beaver tail during unloading. Finally, after much trial and error, it was found that adding  a long piece of reinforced angle to each side of the trailers did the trick.In the final design, the reinforcement piece was an angle of about 5" x 8" x ½' with an added long crescent shaped ½" cap. Where the crescent cap peeked, at the weak spot, the vertical side of the reinforcement and angle together measured about 14" tall.What I'm trying to underscore with all this,  is that it takes a lot of vertical metal to hold a cantilevered load in a trailer application.Good Luck
Reply:Retired IWMobile home frames are not "overly strong" by design.  They are designed to carry a well distributed load to a destination.  At that point they are generally blocked up every 6-8'.  If you notice a moble home being transported, you'll note considerable flex in the frame.With that said, a 15' overhang, would be excessive and very difficult to reinforce.  I think you'd be better off cutting about half that overhang off and reinforcing the balance of the trailer.  I'd pay particular attention to reinforcing the tongue attachment point since most are designed to be unbolted and removed.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:If you haven't already committed yourself to the internal bracing at this point. You might try finding another trailer frame & double the side rails creating a Box frame rail configuration.  At least from the rear to somewhere well in front of the spring hangers. This should more than double it's strength.IF IT WORKS, DON'T FIX IT2 Lincoln CV-300 / LN-7 GMALinde-VI 253,400 & 450 w/MIG35 feedersCNC Table with Oxweld O/A & Hypertherm 1250G3Lincoln Ranger GXT 250Hobart-MicroWire 300ESAB Heliarc 161ESAB-Mobilemaster 2 CC/CV Feeders& more
Reply:??You want 19 ft 8 inches from the hitch to the center of the pair of axles, and then another 15 ft 2 inches of trailer+load hanging off the back?A 36 ft long trailer on 3/16 inch thick 6 inch C channel?And your plan is to load it up with hay bales?That's a LONG trailer and not much structure.Try a different idea/plan.  That long floppy wiggly trailer isn't going to very strong at all.  The best laid schemes ... Gang oft agley ...
Reply:Originally Posted by MoonRise??You want 19 ft 8 inches from the hitch to the center of the pair of axles, and then another 15 ft 2 inches of trailer+load hanging off the back?A 36 ft long trailer on 3/16 inch thick 6 inch C channel?And your plan is to load it up with hay bales?That's a LONG trailer and not much structure.Try a different idea/plan.  That long floppy wiggly trailer isn't going to very strong at all.
Reply:At ~2000 lbs per round bale (depending on size and moisture content), you are going to put 6000+ pounds hanging off a 15 ft cantilever?  The best laid schemes ... Gang oft agley ...
Reply:Before it is overstressed,.a C6x10.5 channel can support only 75 lbs per foot on a 15 ft long cantilever with your 19 ft front span loaded with 75 lbs per foot load.At that load, It will deflect 4.25 inches at its unsupported end. In other words, forget it. Miller XMT304 w/22A Wire FeederLincoln Electric 3200HDHarris OxyAcetylene TorchesHyperTherm Powermax 45
Reply:6000 pounds (3 bales) uniformly distributed on two 15 ft long cantilever beam frame rails sharing the load equally (fixed on one end, which your trailer idea really isn't so the actual bending and stresses will be even WORSE than this example calculation), for a C6x8.2 (closest standard C channel I see to a 3/16 thickness) A36 steel (or equivalent material with a 36 ksi yield strength) is:- OK in shear stress, but not quite enough of a safety factor for the real world;- grossly overloaded in bending stress by a factor of about 8 times (allowable maximum bending stress is 7 ksi, calculated bending stress is 62 ksi !!!! );- calculated deflection (bending) at the end of the beam is close to 6 inches.So again, the answer to your question about the proposed trailer design/materials/load is  No.  The best laid schemes ... Gang oft agley ...
Reply:i dont know if your  missing  the  3x5by3/8  40' angle  iron welded to  6" channel iron or not  but  now i am  also going to  add  a  4" schedule  40 pipe in the  angle of the  angle iron  40' long  also. one  thing at  a time  im  getting the  angle  in  2  weeks and  get  that  done  then  the  pipe  almost  500.00$ just  for  the  angle  4 pieces 20' yikes. in  mean  time i did  buy me  a  real  7   bale  hay  trailer  from  red  rhino  basicaly  same  design.  lot more  money.  home  made  versus  store  bought  5g's to  1g.  thanks  for   your  help