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"Corona-ROC" gymkhana track

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  • "Corona-ROC" gymkhana track

    This has kept me busy for the last few weeks. I had built the table tops a few years back and not finished the project, so with having not much else to do I got on and got it done:

    I wanted a small test track and had decided to use the concept of the "Race of Champions" tracks, where two cars run the same route but half a lap apart and you only really know who is ahead when the cars cross the finish line. My tabletops provide a 6 foot by 4 foot area split in half along the 6-foot side:

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    I marked out the design I wanted after looking at lots of different ROC tracks from various stadiums around the world. I decided not to build a bridge, just a cross-over, so I had to make sure the cars would arrive there at fairly different times:

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    I used a small Bosch trim router for the slots and braid recesses, it's powerful enough to handle the MDF and its small size makes it easy to work with on a small table. I also hooked up my shop vac with lots of duct tape to control the dust, and that worked really well.

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    The braid recesses were easily done with the excellent Slot Car Corner router bit, it works a charm.

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    For the surface paint I used a product called UMA (urethane-modified acrylic). It's what I have on my big track and it works really well for lots of different tire types. It's a little on the expensive side, and has to be tinted, but IMO, it is worth it. I used a little squirt bottle and a paint brush to get down into the slots. The surface got two coats with a short nap roller.

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    Last edited by Gascarnut; April 26, 2020, 07:49 PM.
    Dennis Samson

    Scratchbuilding is life
    Life is scratchbuilt

  • #2
    I cut this topic into separate posts to be sure of uploading all the photos.

    After the surface painting, I decided to lay the braid next. I spent some time pre-taping the braid I had bought years ago before Slot Car Corner offered this service. I taped 6 feet at a time, stretched along the length of the table top. I needed about 80 feet of braid taped this way.

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    I needed to drop the braid at the cross over, and decided to cut slots rather than drill holes, so I made up a little tool. Just a small bit of stainless steel with the slots drilled and filed, then the plate was soldered to a piece of brass strip that located it over the slots. A 2mm drill in my Dremel was then used to cut the slots. It worked a charm.

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    Then it was onto the braiding, really easy with the tape already on the braid.

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    Next thing? Well, test of course!! I hooked up a power supply and a controller to the braid drops and tried it out by driving two cars with one controller. It worked fine at low speeds so I was happy to go further.

    My intention was always to wire the track with both DC and AC power, so that I could test my regular cars on the DC, and then run cars fitted with diodes ont he AC, running two cars in one lane. This is the concept developed in the midwest called AC2Car. More of that later.

    Once the braid was down, I started on the outer barriers, cut from 1/8" hardboard, and curved on two corners to allow space for the controller hookups at each end (nice 6 ft separation!): Click image for larger version

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    Then I painted the barriers, white inside and a nice royal blue outside.

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    Now It's looking like something!
    Dennis Samson

    Scratchbuilding is life
    Life is scratchbuilt

    Comment


    • #3
      Post #3 concerns wiring and power. I turned the tabletops upside down and wired up both a DC power supply (the black one) and an AC transformer (the white one). I figured if only one was plugged into the mains at any one time, I would be fine. Turned out a little different!

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      After doing all the wiring I flipped the tables and tested. The DC side worked great, so I modified the two Scalex Rally cars I want to use for the AC power and tested one of those. Oh dear, so slow! did maybe three laps then everything just stopped. The power supply had evaporated in a massive heat build-up. I figure that somewhere the two circuits were not cooperating, so I decided to take a different approach. I re-wired a little to bring some connectors out the side of the frame and will use one power supply at a time and hook them up as needed each time. Hopefully I won't fry the new AC supply that is still on its way to me!

      Suitably humbled by my lack of electrical understanding, I continued with stuff I know a little more about. I decided after some time to decorate the surface like a parking lot gymkhana, so the first thing was to mark out a parking lot. this took a roll and a half of masking tape!

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      After painting the lines for the stalls, and some yellow hash marks, plus some direction arrows:

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      The plan was to have an access road down one side of the lot where the start line will be, and to cut down on all the painting, I turned the access road at right angles at one end of the board.

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      Dennis Samson

      Scratchbuilding is life
      Life is scratchbuilt

      Comment


      • #4
        Post #4 - the finale!

        I had been painting a bunch of old car tires during the other activities, eventually ending up with 100 or so in red and white. I also made soe traffic cones by cutting some tapers into a length of 5/16" wooden dowel, and giving them each a 3/8" square base of styrene sheet. The tires and cones were stuck down in spots to designate the track and give the impression of "racing lines" by offsetting them in the apex of the turns. A few extra road arrows and call it done!

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        One or two shots with a car, just to give an idea of how it looks. It's fun to drive sitting down to get your eye closer to the level of the track, for extra realism.

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        Once my replacement AC supply arrives I will update this with some multi-car action.

        Thanks for looking, I hope you like what I've done.
        Dennis Samson

        Scratchbuilding is life
        Life is scratchbuilt

        Comment


        • #5
          Wow! This is such a cool concept track come to fruition. Great parking lot design. I'm looking forward to hearing more about the AC part of it.
          Eddie

          Comment


          • #6
            wow! very impressive.very clean

            Comment


            • #7
              Very nice I will be curious to see how the cars compare on this track to your big track.

              Comment


              • #8
                As both a slot car guy and an autox'er i think this is awesome!

                Looks like a hoot with a couple friends as well!

                Zack

                Comment


                • #9
                  Very well done. Great use of space and love the realism. As a single lane DC track I can envision hours and hours of fun time trialing cars just like happens in parking lots with full size cars. If you have fellow racers you can take turns with same or different cars and race against each other's times.

                  If anyone thinks they don't have room for a track this should dispel that myth. If built so the 2 sections can be stacked and a top placed on them the result would be an innocent looking small table that could be used for anything. It would just take a little thought and planning.

                  Comment


                  • #10
                    Beautiful work, Dennis, I love the attention to detail. If memory serves, I remember that Citroen too (my nemesis...). We had some great races in that series, oh so many years ago. I still have mine.

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                    • radarek
                      radarek commented
                      Editing a comment
                      What a sick ride....

                  • #11
                    Pretty much the coolest things I've seen in years... well done. Very well done.
                    Slot Car Nerd/Photographer/ Just a self-styled marketing guy on my back porch.
                    Check out my YouTube channel for weekly slot car news

                    Comment


                    • #12
                      I've been thinking of doing a track like this that would fit in my MINI that I could take to our local Cars and Coffee... this might have just been the tipping point for me to actually start to make this happen.
                      Slot Car Nerd/Photographer/ Just a self-styled marketing guy on my back porch.
                      Check out my YouTube channel for weekly slot car news

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                      • #13
                        Outstanding!
                        -Harry

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                        • #14
                          That is really nice. I just acquired a steel bed frame (6 foot 3 inch x 3 foot 3 inch) to make a 1/32 test track and it looks like I am going to adapt your idea to my frame!
                          Why doesn't my car run like that?

                          Scott

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                          • #15
                            Great job. Looks awsome

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