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  • Keeping them alive...

    I've just about put the finishing touches on the poly skid plate on the Chief. The bottom was cracked in a few spots, and quite frankly, I feel there is no "ultimate fix" to a cracked bottom of you want it to be waterproof, and want to be able to actually use an AATV for its intended purpose. Other fixes include riveting steel to the body(heavy), using fiberglass resin and mat (OK, but doesn't stand up to abuse well) and other methods, but I wanted something that would really take what I wanted to dish out on the machine.

    The skid plate is a full 1/4" thick HDPE that is in two pieces. I would have used one sheet, but it had to be cut for shipping. It turns out that two pieces was a bit easier. Its held on with 72 (or so) steel shank waterproof rivets that RI uses on their machines. I was dismayed that I couldn't get the poly to wrap up around the sides well enough to incorporate into the axle flanges. It's plenty strong, though. I'm just not entirely pleased with how it terminates so abruptly on the bottom.

    The forming was done with a heat gun. It works tremendously well, as long as you're patient. There was a lot of force with jacks to bend the poly and hold it in place once it was good and mushy. It incorporates the rear trailer hitch, and it has two threaded drain plugs I've added since the pictures were taken. The first time I had it out (and many times since then) I've been forging through the brush and found that I suddenly stopped forward progress altogether. Each time, I was centered on a different large boulder. No cracking, thumping, creaking or anything. It just rides up it and stops. There's virtually no deformation in the body, either. I can jack up the entire machine with a floor jack right in the center of the body. It was quite a bit of work, but well worth it to keep the 'ol gal around for a few more years. There's no water around here yet, so I haven't had the opportunity to check for water-tightness.

    I recommend it to anyone with a body that they're thinking about junking because of lower tub issues. The pics aren't great, but you get the idea. More pics in my gallery...





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  • #2
    Man...that looks really good. Especially the bottom, it is obvious you spent some time on that.

    What is the scoop on welding HDPE with the plastic welding kits they sell? I seem to remember reading that it did not work too well for some reason. It would be sweet if it did, you could weld pieces to the side to incorporate the axle flanges. But that is definitely some great work and information.
    Hammers should have warning labels.

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    • #3
      thanks for the compliment... The bottom took the longest. Lots of heat and jacks, etc., lying on my back.

      I have a plastic welding gun, but it's a budget unit, and I've only ever tried it on ABS for about 2 min. I couldn't get it to work right, and I haven't tried it since, since I haven't really needed it. Some welders work a lot better than others, but I can't comment on which one's do. This project didn't need any welding. The seams are sealed with black silicone adhesive. It should hold out any water and debris...

      Oh, forgot to add the most important part of the project. It was cheap. The poly was $19, $20 to ship it... here's some more on this ebay auction.

      ~m
      Last edited by hydromike; 09-10-2007, 02:24 PM.
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      • #4
        Looks great, Mike! I think I might have to copy you when I start on the body work for the ST/295.
        "Looks like you have a problem with your 4 wheeler........you're missin' two wheels there"
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        • #5
          Excellent work, Mike; I never would have thought HDPE would comform that well to the bottom of the machine. It must have taken LOTS of effort.

          Now it makes the top look really drab..... I guess now you'll have to start PAINTING the rest of the machine!!!???

          Stuck in the seventies- not in the swamp.

          (6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far

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          • #6
            Mike, that looks great! I would love to do that to my Max too I just don't know if I have the patience There have been a few times that I have tried to push sharp rocks with my tub and I was worried about the outcome. This would be perfect for that. Plus with the kind of rigidity that you got I'm sure it helps keep everything else in line too. Great job!

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            • #7
              Originally posted by Don View Post

              Now it makes the top look really drab.....

              Awww... C'mon... I already have the new stickers made electronically, and I have plenty of sand paper to get the color back.... I just don't have time now...
              She'll have to stay fugly for a bit longer.

              The effort was certainly there, but it was more patience than anything. A 2x6 under the body and jacked up with 4 floor jacks in strategic places was the key to forming it to the bottom. Here are a couple more pics (also in the gallery) of how it came together. No laughing at my equipment.

              Hey, is that a RIM hiding back there???





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              • #8
                That's one great looking skid plate. Good job. When can we start drop shipping our cars to you for this well needed upgrade? I'm laughing at your equipment only because I remember you saying once in an old post that there was always a tractor in the background when Don took a pic of you. Very creative. How thick is that? I have alum skid plates down the troughs of my Attex and they are torn up pretty bad already. I hate to think what it would look like without them. I think what you've done would slide over things a lot better. Great job.

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                • #9
                  Thanks Whipper... the poly is 1/4" thick... it's easier to bend it in more direction than once than aluminum, and it does slide over stuff pretty nicely. I really like the abrasion resistance, and the fact that you can't really "dent" it, unless you're doing something really nuts.

                  I wasn't sure what the outcome would be and how well it would conform, but I'm super pleased. The threaded drain plugs (no pic yet) really round it out. I hope I don't shear them off on something, but I don't do a lot of heavy rock-cruising, aside from the "practice rock". With this plate, I've tripled the amount of material on the bottom of the machine, with a weight gain of under 12 pounds. A solid trade-off, I think. The next one, if I do it, will be a bit cleaner. My arm still needs to heal from pulling the 72 steel-shank rivets, 99% of which were done on my back underneath the machine. No pneumatic riveter here, folks. (flexing and pointing at a full 6" diameter bicep...)

                  ~m
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                  • #10
                    I like the way that poly looks on yours. NICE, clean install. You say it forms decent when heated? Did you form it then seal it before riviting? just worried about heating it with the sealent on, weather it would hurt the bond by making it set-up faster. Sorry about so many questions, I just bought some of that 1/4" thick HDPE to put on my Argo. Ummmm....hey Mike by the way.......can I borrow a tractor or two?
                    Last edited by z-partsman; 10-02-2007, 02:45 AM.

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                    • #11
                      thanks for the compliment partsman...

                      The HDPE is very maleable when you heat it up. You can actually bend it around with your hands if you have some nice heavy leather gloves on. Focusing the force with jacks and blocks of wood really make it go easy.

                      I had the whole thing riveted up before sealing it with black silicone. The goal of the silicone was mainly to keep debris from getting lodged in between the skid and the body, not for waterproof-ness. The rivets have a rubber seal on them to aid in the waterproof-ness, so it should be close to water tight with or without the silicone. The problem with silicone is that it doesn't adhere to either poly or ABS well at all. It'll peal right off. I left a small gap (<1/16") in between the poly and the ABS to get a bead of silicone to work in the gap. As it cures, it should take the shape of the gap, and be difficult to wrip out.

                      ~m
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                      • #12
                        In a word ----BRAVO!

                        Looks like a great job, and you say it's your first--not sure I believe that! LOL!

                        I wonder how well some 3M strip caulk would work for waterproofing if it were packed around the edges- that is if you wanted waterproofing.
                        Last edited by brushcutter; 08-08-2009, 10:21 PM.
                        DESTRUCTION is just a couple of vowels down the street from DISTRACTION

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                        • #13
                          Was just thinking????? ANYONE KNOW ???

                          Iv been doing some looking & thinking about putting a skid plate under my max II > 1972 HOGWILD . I was looking at HDPE 1/4 " thick 4' X 8' sheet $ 140.00 then came across UHMW 1/4 '' thick 4' x 10' cost $40.00 more than HDPE but have found it will slide a little better over things and was told its a little tuffer too. I was thinking about how to form this stuff and I think it might work but not sure.. I know this will have to be done with just the bottom of the max II up side down,no axles in order for it to work. and only doing a 4' X 4' sheet at a time. I was wondering if it could be boiled in hot water to make it soft in order to form it and using a rolling pin first then going over it with a heat gun to finish it up.Im not sure if it will work but would be nice and alot faster than using a heat gun only. Just wanted to see what you guys think and if you have any other ideas or advice..??..

                          Hydromike love what you did man looks great.. Hows it holding up after all this time??? Have you had any problems with it at all.. what size rivets did you use??

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                          • #14
                            Nice work. I'd like to do this on mine.Just for trail riding. It's a rock farm where I ride. Know anyone who wants to buy some rocks,Heck I'll give 'em away !

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                            • #15
                              Any suggestions as where to get poly like this? The Ebay listing is gone now.

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