From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:v9qs3p$20ooe$1@dont-email.me...   
      
   >> "Jim Wilkins"  wrote ...   
   >> There may be other ways to design a self-assembling gantry crane, ...   
      
   >I have to admit I don't always read your posts from end to end when I first   
   >see them.  I skim them, and then come back later and read them more   
   >thoroughly if there was something that caught my attention.   
      
   That's fine, I click Send when I'm bored with proofreading and editing them   
   myself. I try for completeness so they might serve as an unfragmented   
   reference if someone has a relevant problem to solve. Mostly I post for   
   practice in technical writing which I flunked several times, and they are   
   tests for senility when I read them back later.   
      
   I found another way to set up a gantry without a separate hoist, by making   
   the supporting posts pivot on horizontal bolts at the ends of the beam. If   
   the beam is raised a short distance as on sawhorses the chainfall, pinned to   
   the track, can pull against the base of a support to fold it further inward.   
   The reference mentioned ratchet strap pullers to help as well. I tested a 2"   
   ratchet cargo strap for vehicle recovery and it reached 1000 Lbs tension   
   while pulling my truck through a snowbank.   
   jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)