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pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
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That arm on the front stays inside the maximum robot volume, right? It looks like you're going with the tall dimension set, and it also looks like lowering that arm is against the rules.
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Teams need to make sure they read all rules pertaining to robot size carefully. I would hate to see a robot this well designed get to a competition and then not pass inspection. |
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You don't think it's more likely that you have an inaccurate perception of the robot's dimensions? It's not against the rules to lower the arm as long as the robot still fits within the volume with the arm lowered (i.e. their chassis is shorter to compensate). This is clearly the case here. If the arm doesn't go past the bumpers then it's legal for it to be lowered even at max dimensions. |
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Looking slick Allen! |
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See these photos for reference. The pic with the grey gear is current, the pic with the yellow gear is from an older revision, but demonstrates how the intake fits inside our front cutout. |
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The robot frame is a ~29in square making our dimensions with bumpers about 36" square. That gives us 4 inchs of room to extend past the bumpers. The mecanum intake and the gear intake both come close to the full extension limit but can't possibly break it.
And of course we are short. Top of the robot is 23.8in I believe but the student that's doing most of the shooter CAD can tell you for sure that we are under. |
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Allen,
Really cool bot, love what your team is doing with the open build/blog. Seems like a great learning experience for your team. Whats the process for scoring the gear once in the gear holder? Great work as always, -Mike |
Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
Very nice. What is the upper appendage intended for?
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This makes me wonder how they'll inspect boundaries this year. Our arm is 1" within the boundary with fully-down, but comes to within 0.25" of the boundary during articulation up/down.
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Great looking robot there! Awesome cad work as always.
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I'd assume we will be iterating on the drop off portion all season to make it as fast as possible without compromising it's pickup speed and ability to securely hold the gear during high speed collisions. |
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What is your shooter drum made out of?
This is awesome, just wish my computer would load the step file so I could get into the model more. |
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Granted, we did used solid 4" conveyor wheels [I know them as fairline (Fairlane?) Wheels, but maybe Allen can reply with their proper name] to shoot in 2016, and those loved to expand so maybe we're just used to shooter wheel expansion. |
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How many balls can you guys hold? Doesn't look like the traditional hopper to me, are you planning on intaking only?
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Great bot as always! I really like the built-in handles.
Nice work! |
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So all in all, not surprising your tube wanted to expand more than Spectrum's. Are you guys going for a longer shot to need that much more surface speed? *Yes centrifugal. Pedants are welcome to spend 15 minutes drawing a FBD with a tangential velocity, required change in velocity to create a circular path, implied acceleration, unbalanced force to create that acceleration, etc, etc. I'm going to pretend it's a real force and get on with my life. |
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Nice job 3847! What are the servo motors on the front/back of the shooter for?
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This is so amazing!
My team and I just had a few questions: What is your shooter compression and how did you settle upon this number? What is your intake height and how did you find this number? |
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We wanted to design to the smallest amount of compression we could get to work and increase if needed. That way we start with the least load on the motors and add load as needed. |
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Great design! Ironically, just looking at your rather complex robot, I was inspired of a way to make our gear pickup MUCH simpler (replace two motors with one belt). Thanks!
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Beautiful looking robot... and the CAD is nicely done.
I am looking forward to seeing how this plays on the field. Well done!! |
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3847's robot is a good example of leaving a conservative amount of space (just an inch or three) for OTB stuff, but I bet others left way more than they should have. |
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I really like the design of this robot. I wish we'd have considered a gear pickup on the same side as the fuel intake because I think fuel on the floor will make it difficult to reach gears in some cases. |
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This CAD looks beautiful, cant wait to see this robot on the field.
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Considering even a full length robot can actuate their front roller so that it occupies the space between the frame and the edge of the bumper, this advantage starts to seem limited to making the collector wider. Again, this is a sizeable advantage, but at the same time, the field will have hundreds of balls on it, and I'm not sure the complexity of this solution is justified for this benefit. It's not zero benefit, and it's certainly worth exploring for many teams, I just wonder if the tradeoff in complexity and / or ball storage will end up being clearly worth it or not. This isn't the path my team took and it certainly simplified a lot of the robot once we decided not to do this, plus we still have the option to switch to a drop-down "in-the-bumper" intake if we really need that little bit of roller to grab balls against walls. |
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I'm sure you guys have done your research and totally know what you're doing here, and I don't mean to doubt that. Just trying to share a data point. |
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Nice work 3847. SJCP has come a long way since I left in 77.
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Another benefit of an over the bumper intake being the full width of your front bumper (minus the 3.5 inches of side bumbler on each side) is that it minimizes the ability of balls to space you off the wall by 5 inches. Even with the maximum size gap in your front frame perimeter you still have 19 inches (6*2 + 3.5*2) of bumper without a way to move balls out of the way Scoring gears, picking up gears, inbounding fuel from both the hopper and human player station, and catching HE fuel rebounds are all potentially compromised when your robot can't get flush to the wall. With some spinning and approach angle practice maybe you can knock those balls flying with some consistancy, but critical seconds could be wasted each time you perform one of those operations.
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Are you using a PTO for your climber? Or will it be linked to one side of your drive at all times? If so, are you concerned about any additional drag generated for that drive side? Are you going to steering correct with sensors/software?
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The process has been detailed in our most recent blog post, which includes a download link to the calculator we used to design the rack teeth. Spectrum Blog ![]() ![]() |
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