Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Garage ideas for preloading a 14bolt weld on axle truss

Discussion in 'The Garage' started by BorregoK5, Apr 15, 2002.

  1. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    I'm getting ready to truss the top of my 14 bolt but I lack the equipment to preload it... any slick ideas or tricks to doing this?
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,167
    Likes Received:
    1,365
    Location:
    E-town baby!
    With the axle on stands get a bottle jack under the center section. Get a length of chain and loop it around the tube on the drum side of the perch on each side and under the bottle jack. As you pump the bottle jack it will try and bend the axle tubes downward giving you your pre-load...

    Rene
     
  3. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    Good idea! ... and to think I'm sitting here trying to figure a way to do it with my cherry picker... a bad case of rectal cranial inverison, thanks for the surgery!
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,167
    Likes Received:
    1,365
    Location:
    E-town baby!
    LOL...I've had to use that method for straightening heavy haul trailer frames many times. Glad to help.

    Did you ever get any pic's of your second prototype shackle flip brackets? I tried your sneak peek link last time but it didn't work for me...

    Rene
     
  5. Eagle

    Eagle Registered Member

    Joined:
    Feb 17, 2000
    Posts:
    72
    Likes Received:
    0
    Location:
    Suprise, AZ
    Insert stupid question here. I have read on this form that preloading an axle trust is good. Why? I am not a gear head and am not sure of the physics behind preloading and what that will do for you when you are wheelin? It sounds like you want to put pressure on the third member and raise it. (to resemble a frown) Is that right? How does this help?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,167
    Likes Received:
    1,365
    Location:
    E-town baby!
    Once it's been welded with a small amount of preload the weight of the truck and the stresses it will see wheeling will get it almost dead straight. Ever hung a heavy door? I keep the latch side a little higher than where it should be. Then when it's all bolted up and you take the support out it will be nearly perfect.

    By preloading the housing any slack or imprecise fitting will be made up for when the preload is removed as well as helping to compensate for weld distortion.

    Rene
     
  7. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    Couldn't have put the preload into better context!

    I'm going to pick up the raw brackets right now so by tonight they should be assembled and installed. I've got my site up and running with the info, and pictures tonight or tomorrow if all goes as planned. It just rained so testing these new ones should be fun and make for some good mud video action!!! Click the signature link, I'm keeping all the info there for now.
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,167
    Likes Received:
    1,365
    Location:
    E-town baby!
    The link works for me now. Looks much stronger/better than the first version! I like the flexibilty of shackle location.../forums/images/icons/cool.gif

    Rene
     

Share This Page