Combat Robot Spinner Design Tutorial (Part 2): Motors, Pulleys, Applications and More

No video

Combat Robot Spinner Design Tutorial (Part 2): Motors, Pulleys, Applications and More

Рет қаралды 6,403

Team Just 'Cuz Robotics

Күн бұрын

Пікірлер: 19

@JustCuzRobotics 4 жыл бұрын

For those looking to see a simulations in Fusion 360 tutorial, I made one a few weeks back! kzfaq.info/get/bejne/e798fJCKrrrMpKs.html

@RuddyDuck1411 4 жыл бұрын

Yes definitely would love to see how to do the simulations. Going to be redesigning my weapon (500g asymmetric which is only giving similar moi to your disc, it looks really cool though) and don’t want to thin it out too much.

@Leatherface123. 2 жыл бұрын

Also an example of a bot that has a lot of flex and no failure or warps is nightmares when icewave hit nightmare the bot was fine, but it’s disk warped and hit the side of the frame, it bent a good 20°+ causing the frame to warp, but the disk was perfectly fine afterwards

@gennadiykatsman674 4 жыл бұрын

Hi Seth, thanks for the continuation of this weapon design series. As you mention in one of the text overlays, I’d like to see a tutorial in setting up the center of mass/force/load analysis in Fusion 360.

@caesium2339 4 жыл бұрын

Yup we would love to see such a load condition on weapon.

@JustCuzRobotics 4 жыл бұрын

kzfaq.info/get/bejne/e798fJCKrrrMpKs.html

@ianhoolihan2396 2 жыл бұрын

Do you consider offset inserts to be 1 tooth or 2 teeth for bite calculation? Because in a given radius along an impactor path, it is essentially an asymmetrical design

@JustCuzRobotics 2 жыл бұрын

Well that depends on if both teeth can hit the thing you are driving into or not. In most cases they can but if you are attacking a corner of a bot or hitting with just half your weapon then you might get the benefit of a single tooth design.

@ericstratten6974 4 жыл бұрын

The KINETIC uses a 1980kv Inrunner at 2:1, just look at the spare parts

@EleanorPeterson 4 жыл бұрын

I realise that it's a heavyweight bot and so not really connected with Seth's current work, but I find the vertical weapon design of Cobalt (2019 BattleBots iteration, black and green) odd but curiously pleasing. Why? Because the guys put fight philosophy ahead of weapon efficiency. They deliberately went for a massive, solid, ripping-tooth disc, apparently sacrificing a lot of absolutely 'correct' theory for strength, after taking into account the kind of opponents their bot would be facing. To wit: yet more great big powerful spinners. Using more of the engineering points Seth has explained in these last two videos would certainly have given Cobalt a very efficient weapon, but... But that's where the 'unknown' bit of their approach comes into play. The fight philosophy. I think they'd planned to use Cobalt almost as a battering ram against other spinners, and that needed colossal strength rather than (just) an effective bite. Smashing into modern steel armour plate (or the arena wall) is also a great way to destroy your own weapon, so the Cobalt boys seem to have designed a technically 'wrong' multi-tooth weapon that looks more like a cutter from a milling machine than a regular disc. They still have a lot of destructive power, but based on their (presumed) head-on attack philosophy, it's more likely to wreck their opponents than themselves. [Note; the above musings are purely my own opinion; I have no idea what Cobalt's really up to; I'm not connected to the team in any way. I'm also not a qualified engineer, I'm just someone with a long-time passion for bot building. And wrecking stuff.]

@JustCuzRobotics 4 жыл бұрын

Well... I'm sorry to burst your bubble but while they carefully hid it in the photos, if you look closely at any of the footage where Cobalt hits the opponent in slow motion they actually do have a single tooth weapon. They repurposed a multi faceted milling cutter but seem to have welded on a single biting tooth sticking out further which is deadly effective. You can also see in their fight with Minotaur their alternative white weapon is also a purpose built single tooth weapon with no extra weight on extra small teeth. Not to say cutting weapons with more than four teeth cannot be effective, but there is simply no better way to grab hold and toss an opponent than with the maximal bite you get from a single tooth design. Take a look at the slomo at the end of their fight with Duck. (about 2:36) kzfaq.info/get/bejne/h82gqrl1u7CVZqs.html

@bunimonibu 2 жыл бұрын

why does your new one-tooth spinner have a V-shape pointing to the tooth, instead of a full circle? seems that would increase MOI and also decrease air drag. you'd make the part of the circle opposite the tooth thick (like you have it).

@JustCuzRobotics 2 жыл бұрын

Ive been using the single tooth spinner for over a year now. I'm finding it hard to visualize what exactly you are saying. Higher MOI isn't always the goal though. And drag hardly matters with weapons as thin as mine are, Division uses a ton less power than all the beater bar robots do. I have measured it drawing only about 9-10 amps at full speed. The new 2 tooth Superlight Slicer blade (used with the fork config) is designed to minimize MOI so the bot gyros less when turning.

@thorwaldjohanson2526 Жыл бұрын

I think one point is to have only the tooth stick out. If you have a circle with a tooth sticking out, another spinner oriented 90 degrees (horizontal against his vertical or vice versa), there is a higher chance for the enemy weapon to impact your circle weapon on the side. The v design significantly reduces this chance. But I have no idea if that was the reason for him doing that

@bunimonibu Жыл бұрын

@@thorwaldjohanson2526 well if drag doesn't matter, and higher MOI isn't the constraint he's up against, then the circle thing is less compelling

@JustCuzRobotics Жыл бұрын

Yup this is correct. The main idea is to avoid horizontal spinners getting a good bite on the side of the tooth. Having a reooev angle behind the tooth rather than a circular section can minimize this.