From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:vp88jh$314pd$1@dont-email.me...   
      
   Well, there is one thing.  I asked about it some time back for some   
   other project.  How do you bend c-channel in a home shop?   
      
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   Some of the used C3x4.1 and C4x5.4 I bought for the sawmill and gantry   
   needed straightening, in both directions. All but one piece of C4 could be   
   fairly easily permanently bent against two other pieces with chains and a   
   hydraulic jack. I jacked at the end to stay out of the line of fire if   
   something slipped or broke, it's a huge crossbow. The one odd C4 appears to   
   be higher strength, like 50KSI instead of 36KSI yield strength. It fully   
   recovered from being bent more than a foot. Its dimensions were slightly   
   less than the rest, which let it deflect more easily within the elastic   
   range, bowing the loaded gantry track sideways until I offset the hangers.   
      
   I wouldn't be surprised if sawing the flanges down to the web would let it   
   be bent cold by hand with enough leverage, or from its own weight if heated   
   enough. At yellow heat I've bent a truck spring by hand. The stiffness is   
   very unsymmetrical, for the C3x4.1 Ix is 1.66 in^4, Iy is 0.20 in^4.   
      
   https://amesweb.info/section/c-channel-section-properties-calculator.aspx   
   The properties are in the Supplements.   
   jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)