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  1. #1
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    Default how much can two 40mm axles carry?

    I want to fit a pair of 40mm axles to this trailer using slipper springs. I know that 45mm axles and rocker springs would be better, but I have the springs already as well as 4 electric brake backing plates and drums with holden bearings.

    Now apparently a 40mm square axle will give you a 1000kg capacity, but two on slipper springs doesn't give you 2000kg, is that right? So how much does it give and any guesses on how much my caravan chassis would weigh?

    Thanks in advance for the help.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  2. #2
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    Yonnee is offline Trailer Bloke & Mild Mannered Moderator
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    Two 40mm square axles with Holden bearings on Slipper springs in Tandem with give you a rated capacity of 1665 Kg (1666.666666).

    If you ordered the axles with Composite bearings (Holden inner & Falcon outer), it shouldn't cost you any more for the axle as it is the same steel stock size, you gain another 167Kg, upping you capacity to 1830 Kg (1833.333333). You then just change the outer bearings to LM12749 & LM12710 cones and cups.

    As for your chassis, a Tandem car carrier I built a mate of mine with that same Melbourne Trailers Independent Suspension weighed in at 500Kg, but would have had half the steel that caravan chassis has.
    Too many projects, so little time, even less money!
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  3. #3
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    Quote Originally Posted by Yonnee View Post
    ..............If you ordered the axles with Composite bearings (Holden inner & Falcon outer), it shouldn't cost you any more for the axle as it is the same steel stock size, you gain another 167Kg, upping you capacity to 1830 Kg (1833.333333). You then just change the outer bearings to LM12749 & LM12710 cones and cups.....
    Thanks for that. I'm guessing that these composite bearings won't fit in my drums though, which have holden inner and outer bearings, or is the outer race of the falcon bearing the same diameter as the holden one?

    I really want to go racing this season, for sanity's sake so I'll probably go with 40mm axles for now, after all my car only weighs 780kgs. This will mean an outlay now of around $250. I'm going to crunch the numbers now on the steel @ 7.88kg per cm3 to see roughly how much the finished trailer will weigh. I'll either sell ther trailer in a few years and build/buy another or upgrade it with 45mm axles and rocker springs.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  4. #4
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    Mick

    I have replied to your earlier thread on this trailer. I estimated my trailer mentioned there at 600kg. It would be more like 700kg when I think on it.

    A long time ago with another project I used a caravan as the basis for a trailer, but as has already been implied it had extra steel but not really where you would want it. Same problem with your caravan.

    Probably do the best you can for now to allow your racing interest and make another trailer when funds permit if you need to.

    Regards
    Paul
    Bushmiller;

    "Power tends to corrupt. Absolute power corrupts, absolutely!"

  5. #5
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    I really want to go racing this season, for sanity's sake so I'll probably go with 40mm axles for now, after all my car only weighs 780kgs. This will mean an outlay now of around $250. I'm going to crunch the numbers now on the steel @ 7.88kg per cm3 to see roughly how much the finished trailer will weigh. I'll either sell ther trailer in a few years and build/buy another or upgrade it with 45mm axles and rocker springs.

    Mick
    At 7.88kg per cm3 that is heavy stuff. I hope it is strong as well.

    Dean

  6. #6
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    Quote Originally Posted by Oldneweng View Post
    Quote Originally Posted by Mick
    I really want to go racing this season, for sanity's sake so I'll probably go with 40mm axles for now, after all my car only weighs 780kgs. This will mean an outlay now of around $250. I'm going to crunch the numbers now on the steel @ 7.88kg per cm3 to see roughly how much the finished trailer will weigh. I'll either sell ther trailer in a few years and build/buy another or upgrade it with 45mm axles and rocker springs.

    Mick
    At 7.88kg per cm3 that is heavy stuff. I hope it is strong as well.

    Dean
    It would be heavy. Probably 7.88kg/m3 would be nearer the mark.

    Regards
    Paul
    Bushmiller;

    "Power tends to corrupt. Absolute power corrupts, absolutely!"

  7. #7
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    Quote Originally Posted by journeyman Mick View Post
    Thanks for that. I'm guessing that these composite bearings won't fit in my drums though, which have holden inner and outer bearings, or is the outer race of the falcon bearing the same diameter as the holden one?
    Yes they will.


    There are Three common axle/bearing configurations used in the trailer industry;
    • LM: Holden inner / Holden Outer - Machined on 40mm square axles (1000Kg)
    • Composite: Holden inner / Falcon Outer - Machined on 40mm square axles (1100Kg) Also machined on 45mm square axles (1200Kg)
    • Slimline: Falcon inner / Falcon Outer - Machined on 45mm square axles (1450Kg)
    The outer diameter dimensions for both the Holden & Falcon bearing cups are the same, so if you order a Composite axle, the only extra cost will be the pair of outer bearings (cups & cones).
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  8. #8
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    It would be heavy. Probably 7.88kg/m3 would be nearer the mark.

    Regards
    Paul
    I think you should try 7.88 grams per cm3.

    Dean

  9. #9
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    Quote Originally Posted by Oldneweng View Post
    I think you should try 7.88 grams per cm3.

    Dean
    Hmmm.......I made the same mistake. How about 7.88Tonnes/m3 ? That'll teach me to be smart.

    If you can track down a steel mass book it will help you estimate the weight of the materials both existing and additional. I used to have a web address, but I looked just now and it has been removed.

    There will be another somewhere. Even better if you can find somebody with a hard copy.

    Regards
    Paul
    Bushmiller;

    "Power tends to corrupt. Absolute power corrupts, absolutely!"

  10. #10
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    Mick

    This link for a steel mass book may be of help:

    http://www.bjhowes.com.au/Know%20You...eel%20Book.pdf

    Regards
    Paul
    Bushmiller;

    "Power tends to corrupt. Absolute power corrupts, absolutely!"

  11. #11
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    Quote Originally Posted by Yonnee View Post
    Yes they will. .........
    Cool There won't even be any extra cost as I have some falcon bearings kicking around.

    Re the steel weight. I'm used to working in cubic metres, so that's what I calculated it all out to @ 7.85 tonnes.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

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