pic: 4613 Offseason Minibot #1

Dude… this one actually fits in a Vex sizing box…

This is awesome. Any chance you’d be willing to post the CAD up online?

What’s the gearing on the climber? Is that 2x2 box tubing I spy on the drive rails?

I love this mini-bot. Just imagine if 2015’s rules were still in play … all the mini bots. While you’re at it, why not make another mini-bot, this time with swerve. That would be pretty awesome. I already wanna make one like this :yikes:

Specs on Intake?

-Climber is a 775pro geared 30:1 with a 1.25" spool( about 1.375" after velcro)

-Good catch, the drive rails are 60x50x3mm tube. These drive rails contain the 12:40 gear reduction as well as room for 9/15mm belts.

-12mm Polycarbonate sides

-3mm Polycarbonate spatula

-BAG with a 12-48t GT2/3 reduction powering 2-3/8 in T40 wheels( they slightly compress which is nice).

-Raised and lowered by a BAG+VersaPlanetary using a dyneema cord winch with a limit switch at the top position.

This is actually now my favorite robot design.

How much did this robot end up weighing without bumpers or battery?

EDIT: Oh, I should read the first post. :stuck_out_tongue: 32lbs. If you take off two pounds, could you go through a competition season without ever bagging a robot?

I mean you could maybe squeak by if you didn’t put some of the electronics on until competition (as they are COTS parts). That should reduce the weight to just below 30 lbs.

Electronics can be pretty light. There’s a (mildly) easier method.

Pull the intake, disassemble into COTS parts. Toss the custom parts into the withholding bin with the rest of the robot.

BAG+Versaplanetary+wheels ought to be about 2 lb. If that doesn’t do it pull the climber motor and do the same thing. If you can get them both together in about an hour (with some practice) you’re pretty much golden.

Now I really want to try this.

You’re probably right. And it would probably be easier to take off the gear intake than the wedged-in electronics.

Just for fun, suppose a team built this robot for 2017 and the complete robot did end up being under the withholding allowance weight limit. If they qualified for championships, do they need a crate? ALL teams attending the FIRST Championship MUST have a crate to ship their robot in and MUST ship their robot to the FIRST Championship. Do they have to construct a small 5"x5"x5" wooden box to hold an empty locked bag, or can they mail it in an envelope?

If they don’t have to wait to unbag the robot (er, “withholding parts”) can they jump right onto the practice field while everyone else unbags?

If they bring an extra robot to each of their regionals as part of the withholding allowance, and add each one to the bag when they leave, can they show up to championships with 4 complete robots in their pit? Drive them on the practice fields while the real one is in a match? Cheesecake?

That would be a problem under C04, better known as the “Only One Robot” rule.

217-4048 (Colson Performa 3.5" x 1.25", 1/2" Hex bore) - 0.32 lb

The weight of your 4 wheels alone adds up to 1.28. Taking off an intake or climber piece or taking them apart is kinda risky and could be time consuming. Popping off 8 shaft collars and bearings saves you another .576. At that point, pulling off your drive shafts and cutting them (maybe even 1/2) on a pit bandsaw at the event seems to be the next move to save ballpark 2 pounds.

There are a number of cool solutions to this problem, and I’m sure if 4613 cared enough they could shave 2+ pounds off this bot permanently.

Either way, awesome job!

Oh, right, I meant to say “can they show up to championships with 4 complete fully constructed sets of spare parts in their pit?”

I remember 1519 first striking this issue, and another team more recently that put a practice robot in the bag with the comp robot (can’s seem to find that via search). It’s a fun rule. Having a robot lighter than the withholding allowance makes it even more fun! You could call your robot Theseus.

What makes 1519’s case interesting is the definition of robot that year. The definition’s been adjusted since, and makes life a lot more difficult on those wishing to attempt this strategy.

Unfortunately, Mr. R.A. Observer* has made his appearance, summoned by C04 itself, and would say that that’s 4 robots in the pit, not 4 complete fully constructed sets of spare parts in their pit**. (And trust me, I’ve seen teams try to bring in spare-parts-robots before, out of bag–one got a talk from the LRI after two experienced inspectors saw it, the other got turned back at the door, something about “didn’t you already bring your robot in?”)

*Reasonably Astute, in case you were wondering about the initials. If I’m not mistaken, Robot Inspectors are considered to be reasonably astute (unless they catch something that you consider to be legal but they consider to be not).
**I would suppose that if the frame and the electronics and the various other components were disassembled to some degree at the time of observation, save on the competition robot, it could be argued that the team had 1 robot and 3 sets of spares that were not yet together but could be together in time to run another match.

I believe that would be the notorious white and black striped Zebracorns, the bane of all FRC Manual authors in existence.

In reading 1519’s story and thinking about some other more recent games, what would you all (and Eric specifically) think about a design where you could switch the superstructure of your bot on the same drivetrain? Many team’s superstructures alone (especially in tall games) look like robots standalone, but if designed such that it was all under 120 lbs and all of the primary electronics components were on the drive base, I’d argue that legally that situation wouldn’t be much different than for example 2016 mechanisms that were switched if the portcullis or CDF were on the field. That said, bigger attachments like those I’m describing could easily be seen as robots on their own.

Swapping superstructures? Sure, no problem, as long as they’re all within 120 lb or you get reinspected every single time you change one, and all other rules are met. The drivebase would handily satisfy most of the requirement to be a robot, you’re just changing what it can specifically do in that match.