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Thread: Aluminium Swingarms

  1. #16
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    12th March 2010 - 16:56
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    Id make if from 6061, machine the solid sections, use 6061 extrusions. A mandrel bender will bend extrusions with the correct formers, nicely. All will need to be T0, especially if you want to bend it. 6061 will heat treat nicely if it starts off as T0.
    A freind of mine made a 6061 swingarm, he used a steel fixture to hold its form while in the heat treatment kiln.

    A quick and dirty way to turn T6 to T0 is 'paint' the part in acetylene black smoke then gently heat until the black burns off, let to cool slowly in air.

  2. #17
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    5th December 2010 - 23:03
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    Thanks for that, I had thought about a steel jig but I was worried about the jig possibly warping too or the differential expansion of the metals. But if it works I think I’ll go that route when the time comes.

  3. #18
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    28th May 2006 - 19:35
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    Quote Originally Posted by el chupacabra View Post
    Thanks for that, I had thought about a steel jig but I was worried about the jig possibly warping too or the differential expansion of the metals. But if it works I think I’ll go that route when the time comes.
    why not take a drive to wanganui and have a chat with steve roberts, he's got a bit of a reputaion of working with Alloy and one of the bikes he made with an alloy swingarm was seeded as number 1 at the iomtt one year, if that's not proof the man knows what he's doing then i don't know what is. Steve is retired now but I'm sure he will like to chat about it.

  4. #19
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    25th March 2004 - 17:22
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    Yeah like he needs a recommendation. If you can get to talk to him with Spiders introduction then take it

    Just been reading Duke of Wellington article on a British magazine. Jesus.
    Don't you look at my accountant.
    He's the only one I've got.

  5. #20
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    5th December 2010 - 23:03
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    Well, it's been a while but I am finally getting around to making this swing-arm, it'll only be a couple of years late. Instead of for the RG150 it will be for my FXR bucket racer. I scoured the earth for some 2.0mm 5083, but it is unavailable outside of the US/UK so I am going to use 2.5mm 5052 as a substitute. I have tested stretching and forming it and it moves around and bends quite well (the test was done on 3.0mm 5083). I also purchased a large piece of 5083 plate (32x400x500mm) which is sitting on my bench for the rear section of the frame you can see pictured. The rear half will be machined, the top section is bolted on and will be 7075 or 6082 and mounts the shock eccentrically for about 25mm of adjustment. The swing-arm is a loose copy of a TZ125 unit and the linkage is being copied from a Honda RS125.

    My thinking is making the entire thing from 5052 and 5083 will give a very strong end product and the HAZ in the welded areas will not be brittle and less susceptible to failure. The only welded piece of 6082 will be the hoop as its the easiest way to get SHS extrusion.

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  6. #21
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    20th January 2010 - 14:41
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    It would be fun to cut up a Honda frame to make a decent swingarm.
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    I was trying to think what that arm reminded me of
    it was the YZf750
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    this was the works race version of that arm.
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    https://grabcad.com/library/yamaha-yzf-750-r-swing-arm

    https://www.yamaha-forum.net/threads...m-parts.11969/

    there is a video on hydroforming ally sections with rubber and a press on the chassis thread.


    the R6 progressed through a similar arc of development.
    look at 99 vs later

    Your stuff is very cool, Its great to see someone doing shit



    Kinky is using a feather. Perverted is using the whole chicken

  7. #22
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    5th December 2010 - 23:03
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    That is interesting about the hydro forming, my plan for the complex curved piece by the head stock was to make an MDF mould. This would complete the basic curve by drawing the MDF together with threaded rod and then I will 'shrink' the edges with blunt force.

    What kind of aluminium are the cast sections of the Honda frames? Surely something non heat treatable, or maybe the whole thing gets heat treated.

    If money was no object, I would probably get a die made and have a couple of hundred kilos of 7005 extruded and maybe i would get a small supply of 520.2 or 771.2 casting alloy. Alternatively I could press the frame pieces like Aprilia did on the RSW500 and weld them to billet or a casting.

  8. #23
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    20th January 2010 - 14:41
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    Quote Originally Posted by el chupacabra View Post
    That is interesting about the hydro forming, my plan for the complex curved piece by the head stock was to make an MDF mould. This would complete the basic curve by drawing the MDF together with threaded rod and then I will 'shrink' the edges with blunt force.

    What kind of aluminium are the cast sections of the Honda frames? Surely something non heat treatable, or maybe the whole thing gets heat treated.

    If money was no object, I would probably get a die made and have a couple of hundred kilos of 7005 extruded and maybe i would get a small supply of 520.2 or 771.2 casting alloy. Alternatively I could press the frame pieces like Aprilia did on the RSW500 and weld them to billet or a casting.
    I think 7005 and it ages in weeks or months at room temp.



    Kinky is using a feather. Perverted is using the whole chicken

  9. #24
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    2nd March 2018 - 15:32
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    Quote Originally Posted by husaberg View Post
    I was trying to think what that arm reminded me of
    it was the YZf750
    Click image for larger version. 

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    And the 1998-2003 R1.



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