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Steel + Aluminum ok?

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  • Steel + Aluminum ok?

    Wheel adapters - 2 different bolt circles (120 mm vs 115mm) 1" thick - Questions. 1) 6061 strong enough 2) Steel studs into aluminum ok? - no corrosion problems? - anodizing necessary? Generally speaking this whole concept seems like it might not be safe. Am I being paranoid? Thanks all

  • #2
    Not paranoid. you will get inter galvanic corrosion
    The difficult done right away. the impossible takes a little time.

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    • #3
      Originally posted by Oldbrock
      Not paranoid. you will get inter galvanic corrosion
      any way to mitigate? Will anodizing eliminate problem?

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      • #4
        Zinc plated studs is cheaper. Peter
        The difficult done right away. the impossible takes a little time.

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        • #5
          I would not use 6061. I would use at least 7075 T6 much stronger.
          Craftsman 101.07403
          Grizzly G0704
          4x6 Bandsaw

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          • #6
            I would use thread inserts so they can corrode to the aluminium and the thread won't wear with use. Helicoil or any of the other brands.

            I would only use 7075 if I didn't have to pay for it myself
            (or if you couldn't engineer enough strength into the size restrictions...)

            Igor

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            • #7
              Just buy the right wheels for the car?

              I wouldn't worry about corrosion as much as concentric hubs, cracking, loosening bolts/studs, and excess bearing "off center" load.
              Andy

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              • #8
                Originally posted by vpt
                I wouldn't worry about corrosion as much as concentric hubs, cracking, loosening bolts/studs, and excess bearing "off center" load.
                +1. For liability's sake I would spend the $100 rather than potentially being held liable for the rest of my natural life.
                "I am, and ever will be, a white-socks, pocket-protector, nerdy engineer -- born under the second law of thermodynamics, steeped in the steam tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow."

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                • #9
                  Originally posted by ikdor

                  I would only use 7075 if I didn't have to pay for it myself
                  (or if you couldn't engineer enough strength into the size restrictions...)

                  Igor

                  For the op's App you have to ask your self " What's your loved ones life worth " 6061 would never hold up. That said yes the material will most likeley cost more than the addaptor plates he needs.
                  Craftsman 101.07403
                  Grizzly G0704
                  4x6 Bandsaw

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                  • #10
                    Originally posted by kd4gij
                    For the op's App you have to ask your self " What's your loved ones life worth " 6061 would never hold up. That said yes the material will most likeley cost more than the addaptor plates he needs.
                    Your qualified help is greatly appreciated and I thank you, but I need to know; is this an opinion or can you say this with authority? Have you seen a failure? Do you really know the stresses involved. You make this statement without knowing whether the wheels in question are driven or not (or even for a small trailer).

                    I'm not trying to be argumentative, but if what you say is really true I would do my best to dissuade my friend from continuing with this project.

                    I do not have this knowledge (that is why I posted) but if I am going to follow your directions I need to know that you really know what you are talking about. Thanks again; all of you.

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                    • #11
                      There really is not enough information given for an authoritative answer. A good drawing would help.
                      Certain words and phrases really set off the liability alarms, "wheel adapter" is near the top of the list.
                      Historically, wheel adapters have earned a well deserved bad reputation. Primarily due to a few really poorly designed, cheaply manufactured, and haphazardly employed products.

                      Depending on the very specific application, a well engineered part could almost certainly be made from 6061. There certainly are better materials, usually it's just a matter of what's available.

                      Corrosion is fairly easily addressed by selective plating/anodizing and/or something high tech like... paint.

                      Just do a search for "wheel adapter" on ebay for examples.
                      Last edited by dfw5914; 06-29-2012, 02:51 PM.

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                      • #12
                        I cannot see how anyone can give a definitive answer to this inquiry without knowing the SPECIFIC application. If the OP is building a kiddie go-cart, his material choice might be fine. If a high speed automobile... maybe a different answer. You might be able to address the possible corrosion issue, but without knowing loadings and/or stresses, I would make no statements as to a particular material suitability.

                        To the OP: care to elaborate? You may get more and better informed answers.

                        Mark

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                        • #13
                          I'm sorry, I don't know how to post pictures and can't take the time to figure it out right now. I really need to do that though.

                          The adapters will be on the rear of an older turbocharged Supra (front wheel drive, I think). Two 5 bolt patterns of 120mm & 114.3mm. The adapter must be thick enough to cover the lug nuts for the 114.3 bolts. The material he has is about 1.5" thick, 6061 8" flat bar.

                          I figured to bore the holes on the Bridgeport (freshly scraped) and I feel confident in my ability to coach him sufficiently so as to locate the holes within a thou (or 2). The flat bar will then be made round (lathe + fixture or mill + rotary table). We will have to see if the two faces of the flat stock are parallel. If not, then fly cut. The studs will be purchased, are like T-nuts, and are pressed in.

                          So that's the deal. I am very interested in what you all have to say. Thank you.

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                          • #14
                            That is a high performance sports car RWD. I can tell you that Wheel adapters are not alowed at eny race track. And yes I did crack a 7075 wheel adapter an a 66 vw beatle with just over size carbs. thay where 1" thick. Do what you wan't but I would never put them on a car like that. But that is just my 2cents worth.
                            Craftsman 101.07403
                            Grizzly G0704
                            4x6 Bandsaw

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                            • #15
                              I thought all supras were RWD?

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