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  • thin cast iron plate

    Anyone know a source for 3/16" thick cast iron plates? Need pieces about 12" square for some brake rotors. Tried all the usual online suppliers but came up dry.

    Thanks,
    Jeff

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  • #2
    Cast iron is just that-cast. It is expensive to make sheet stock because it must be sawn from a large cast boule. You can buy sawn bar stock, but it is rough and expensive. There is a product called Dura-bar. I don't recall the sizes, but you might check into that.

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    • #3
      Bruce has it. Check into your local durabar dealers. They will supply you with oversize sawn plates but it's up to you to get it machined/Blanchard ground/whatever to thickness.

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      • #4
        WOW,I also needed 3/16 CI Sheet 3 years ago for a project. Needed 3 sq feet and never found it.
        The thinnest I found was 1/2 inch.
        As I recall, Mc Master Carr has some (1/4?)
        Anyway, figure on 50 bucks a sq ft and then the machining time to get it to size..
        Green Bay, WI

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        • #5
          Wait a minute !
          I just reread your post..
          You want round plate..
          I found that.. Its used for cams for screw machines..found 3/16 and 1/4 thick 9 inch dia with 1 inch holes as i recall, but that did not cut it for me.. no holes !
          Check out some old screw machines shops.
          The source I had is now gone..they were closing down when a friend told me..
          Good Luck
          Green Bay, WI

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          • #6
            I don't know about their suitability for brake rotors but cast iron skillets come to mind. Get a big one and turn or saw the sides and handle off. Dare I say Wal-Mart?

            As I said, I don't kow about their suitability for brakes. Please don't laugh me off the board.


            Paul A.
            Paul A.
            SE Texas

            Make it fit.
            You can't win and there IS a penalty for trying!

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            • #7
              But, but...what about Thruds barbell weight idea. He might know if it's good enough quality for this. BTW...what are the brakes for?
              Paul...great idea...stomp on the brakes REALLY hard, heat up frying pan brake... tip car on side...fry bacon and eggs for breakfast!

              [This message has been edited by torker (edited 03-21-2004).]
              I have tools I don't even know I own...

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              • #8
                Hey, can't be any worse than some military vehicles I've driven.

                Paul A.
                Paul A.
                SE Texas

                Make it fit.
                You can't win and there IS a penalty for trying!

                Comment


                • #9
                  The brakes are for a university built Formula SAE car. This is a design event where engineering students design and build open wheel, open cockpit racecars. Here we do 100% of our welding and about 80% of the machining. The only jobs we send out are things we don't have the equipment for...like the splined shafts I've brought up in other posts. Great experience.

                  As far as the plate goes, I've got requests for quotes in for durabar at a couple of companies. The barbell idea has occured to me, and Paul was not the first person to recomend a skillet. Another painfully obvious idea was to get old car rotors from a junkyard and turn them to size. We'll see how it goes.

                  Looking forward to anymore ideas!

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                  • #10
                    JDF...what about some of the new composite rotors that some of the newer cars are using? I'm going to put some on my car soon. They are a lot lighter. You're makin me drool building that car. I spent a whole day climbing under and over David Empringhams Formula car several years ago. Fantastic engineering! Stole lots of ideas for the race stuff I build.
                    Russ
                    I have tools I don't even know I own...

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                    • #11
                      I think using OEM rotors is probably the best and safest way to go about this. If you give us the final dimension and mounting provision you're looking for perhaps one of us has experience with a rotor that is already near net.

                      If you have a website to validate your FSAE involvment perhaps you could ask someone in the business to help steer you in the right direction. Here's some interesting links.

                      http://www.shopthetown.com/reddevilbrakes/rotors1.htm

                      http://www.outlawdiscbrakes.com/rotors.html

                      etc...

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                      • #12
                        Yikes, for that kind of money you can buy ready made brake rotors in sizes from 7" up to 14". Better yet, go to an auto salvage yard and pick up some re-grindables for a few bucks a piece.

                        3/16 CI is mighty thin for brake rotors. After the first couple of turns, I think you'll end up with BOWLS.

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                        • #13
                          I wonder if you could just use steel plate?

                          My guess is that cast iron is used because it can be cast with ventilation slots, maybe it offers some other benefits like quieter braking (guessing), but I wouldn't be happy with 3/16" cast iron, especially not if made from weights etc!!

                          You could get them laser cut from steel with all the groovy curved slots, holes etc you need.

                          This is just an idea, I am no brake expert, but my guess is that motorcycle rotors are steel??

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                          • #14
                            I'd love to find some production rotors that would fit the application but time is limited (2 weeks) and weight would be a problem. Our car will weigh around 600 pounds with driver, and be braking from speeds typically no greater than 70 MPH. Its a tight course to keep speeds down. 3/16 is a typical thickness for rotors in this competition. Some go even thinner with no problem.

                            I am not opposed to using steel. We went with stainless the last two years, but weight and machinability were a problem. The real problem is I don't have enough time left to really look into different options. Basically, I've seen 3/16 cast rotors work, so that was what we were going to shoot for...no way to solve an engineering problem, but saves a hell of a lot of time.

                            Any recomendations for steel if I go that route?

                            Thanks!

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                            • #15
                              Dunno about types, but steel looks like it would be:

                              easier to get

                              much more consistent

                              much less likely to have "break-in-half" type defects hidden in it.
                              1601

                              Keep eye on ball.
                              Hashim Khan

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