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Robot Inspection and Build Rules - Mechanical - Answer Thread

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  • Robot Number Display

    Originally posted by FTC8627
    Greetings - Question concerning RG09. Part c. says "The numerals must each be at least 7.62cm high (3.0 inches), at least in 1.27cm (0.5 inches) stroke width, and in a contrasting color from their background." The answers to posts #68 & #74 mention only "field personnel can clearly and easily determine the team" or "as long as the numbers can be easily read by the field personnel" which refers to part a. without mention of the specific size outlined in part c. Strictly following part c. creates a very large number that can be difficult to mount and also may cover motor and servo controllers making troubleshooting during competition more difficult.

    During inspection at our most recent event we were told our 2.25 in high and clearly visible numbers weren't big enough. As we and other teams advance to area championships and beyond is the intent to enforce part c., or part a.?

    Thanks!!
    A: The intent is to enforce Rule <RG09.c>.

    Comment


    • Robot Inspection and Build Rules - Mechanical - Answer Thread

      Originally posted by FTC8881
      At the last competition the judges had questions whether a Tilt mechanism (https://www.servocity.com/html/ddt50...l#.VtReC_krLcs) was considered a single degree of freedom. To us, this is basically the same as using http://www.tetrixrobotics.com/Motors...h_Bearing_Pack with associated plates and channels.

      Team 8881
      Pirates of the Pacific
      A: This tilt mechanism is a single degree of freedom device and is a legal COTS part.

      Comment


      • Red Dot Scopes Allowed?

        Originally posted by FTC4997
        Post #118 of the Mechanical thread (http://ftcforum.usfirst.org/showthre...ll=1#post26298) states that the mentioned red dot scopes are illegal because they are not powered by the main robot battery. However, it does not say anything about the legality of them. Would a red dot scope (NOT a laser) that is powered by the main robot battery be legal? Thanks!


        A: "Red Dot" scopes are not legal. Focused light sources are disallowed by <R06>.a

        Comment


        • Robot Inspection and Build Rules - Mechanical - Answer Thread

          Originally posted by FTC5501
          Previously I had asked if we were able to purchase the following gearbox:

          http://www.andymark.com/Sonic-Shifte...nicoptions.htm

          It was ruled that I wasn't. However, could we use that as a guide and buy separate parts from Andymark to assemble our own?
          A: You may use the design as a guide to design your own transmission but purchasing the exact parts and just assembling the transmission violates the spirit of the rule and is not allowed.

          Comment


          • Servo Gearbox modification

            Originally posted by FTC5250
            We are seeking clarification concerning the extent of modification that can be made to the servo gearbox. Our understanding is that as explained in post #94 the gearbox is considered a separate part and can be modified in any way as long as no other rules are violated.

            The reason we are asking about this is that we purchased some HS-785hb sail winch servos to be use on a part of the robot that under high loads. They are fairly powerful servos but the gearbox has Karbonite gears and is not strong enough to take the full amount of power that the servo can produce. We wanted to replace the Karbonite gears with metal ones but there was no direct replacement. We instead purchased a metal gearset that was made for the HS-755mg servo. The gears are almost a perfect fit, but still needed some modification to work. Is this legal?
            A: Yes, this is allowed.

            Comment


            • Robot Inspection and Build Rules - Mechanical - Answer Thread

              Originally posted by FTC7337
              Is sugru (moldable plastic) legal COTS?
              A: Yes, Sugru is a legal material similar to other glues and epoxies.

              Comment

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