From: null@void.com   
      
   "Jim Wilkins"  writes:   
      
   > "Richard Smith"  wrote in message news:m1jzc6u3ox.fsf@void.com...   
   >   
   > "Jim Wilkins"  writes:   
   >   
   >> Bending / welding allowances   
   >   
   > You are well ahead of me.  i doubt i can help.   
   >   
   > Press-brake - they have a press-brake, yes - good.   
   > Not new when bought.  Is small "fabco.".   
   > Seeing if corrections / calibrations needed to go in to the settings,   
   > I think.   
   >   
   > --------------------   
   >   
   > Bending allowance can be determined by bending a small test coupon and   
   > measuring the resulting lengths. I've seen welders hammer the cooling   
   > beads but my night school training didn't cover that aspect, it seemed   
   > to be done by experience and judgment instead of pre-planning.   
   >   
   > A practical example is welding a repair in a curved fender. A patch   
   > dished to copy the existing fender shape will flatten from weld   
   > shrinkage. If there's space behind, like on my pickup truck bed, I can   
   > restore the curve with a hammer and dolly, but the integral steel   
   > inner wheel well on the car blocks access for a dolly so if it had   
   > antique value I'd need to preform the patch 'somewhat' deeper to   
   > compensate, or build it up with filler.   
   > jsw   
      
   Lot of experience there.   
      
   Funnily enough, was helping the boss on the press-brake today.  Ran out   
   of folded plate pressings and no other work, so did a run.  The boss had   
   me involved in his (our) measurements - getting the pressings from   
   "nearly" to matches drawing dimensions and angles.   
   Got some idea of the adjustable variables and what error can manifest as   
   on pressings.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)