Recent Posts

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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on January 14, 2020, 10:34:03 pm »
A little more progress the last couple of days. I now have one almost complete power switch (need to make the cover plates on the sides) and two more that are maybe 75%.



Pics:
https://imgur.com/a/qTwNkMq

-Zac
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Progress Reports / Re: Canadian Carnage Robotics
« Last post by rcjunky on January 13, 2020, 08:12:29 pm »
Its all good :)

People like you guys is why I put my thinking cap on for the last year. We had an awesome match while I was trying to make it 3 in a row for Canada and fell short so I needed to change something. I sent the bot for quite the series of plane rides to get some more run time at an event in Seattle and some more doing sumo "locally" to try a few small things and made a decent revision specifically for moto. When I'm not posting all the details anywhere before the event ya know I'm not messing around ;) I did some testing as well with some lift esc tuning and have it turned way up too so its more of a yeeter then a lifter :P Last year it was current limited to 30a at moto, ran 60a at Seattle and BotBrawl, its now at 80a and the data logs show 65a peak with some conservative testing. Thats a lot of power behind the arm. I'm sure with the weight further out (in testing it was like 27lb entirely in the forks) from the bigger bots I suspect it'll hit that current limit still. I look forward to a rematch, I'm sure I'll be fighting at least one of your entries this year.

I think the hub motor on AbsurdiTi is where it needs to be now, it feels a lot more solid and the new bars on paper should hold up well. We're a month away yet but I feel the most prepared for a Motorama yet and this is my 5th in a row (plus 2 for rc racing before that, so 7 consecutive years)
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Progress Reports / Re: Canadian Carnage Robotics
« Last post by TeamAlreadyBroke on January 12, 2020, 11:50:46 pm »
Yes, we successfully completely changed the setup and replaced those springs with straps and used the same springs Aeriform uses further back on the lift arm. The leverage isn't the best, but it returns in a acceptable amount of time and didn't have a single hangup at Robot Ruckus. Ascend finished second only to Aeriform at Robot Ruckus (Flip Special had a multi-way tie for 3rd.)

My only real fear is that once it has full power that the straps may not hold, but only time will tell. I should have turned it up for RR but as you know, one step at a time... we want reliability for Motorama!

Here is our YouTube if you want to see some fights:
https://www.youtube.com/channel/UC3VQoI91AV_jGf1zSJ5FMzw

(Sorry Andrew!)

- Dominic
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Progress Reports / Re: Canadian Carnage Robotics
« Last post by zacodonnell on January 12, 2020, 04:36:47 pm »
Have you made any changes to Ascend since Franklin to deal with the return spring issue?

-Zac
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Progress Reports / Re: Canadian Carnage Robotics
« Last post by TeamAlreadyBroke on January 12, 2020, 02:16:35 pm »
I can't wait to see AbsurdiTi in action! That thing is definitely a monster.

Good to hear you were able to get Llama sorted out and done before the competition this time. Makes me worried for defending the title hehe!

We won't be doing anything to the Sportsmans aside from tuning the drive ESCs for once and turning Ascend up to full pressure finally now that we got the bugs all sorted out. Well, I may add some more ground clearance for Moto too, but we shall see.

Good luck man, and see you there!
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on January 11, 2020, 08:54:39 pm »
The first real build progress came tonight. I got the shop all cleaned up and back in order, then countersunk the holes for the new mid plate. I've got a serious task on my hands to replace the few frame pieces I'm updating, but taking the bot apart and checking all the parts is probably worthwhile anyway. Here's a shot of the new pieces being test fit:




Pictures:
https://imgur.com/a/qTwNkMq

-Zac
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on January 08, 2020, 09:46:43 pm »
I did the majority of the dental work tonight. I ran out of time and will have to wrap it up tomorrow so I can send it to the shop on Friday. I still need to bend the bottom flange back into shape too but that's not super critical.

My 2D parts arrived from the laser cutter, and my mcmaster order is in. My buddy printed the first pass of the jig setup for the corner blocks and they were a little tight so he opened it up 5 thou and it sounds like it fit. I'll check that tomorrow too.

-Zac
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Progress Reports / Re: Canadian Carnage Robotics
« Last post by rcjunky on January 08, 2020, 07:19:34 pm »
This weekend I moved about 5 hours away from home which means all my moto prep had to be done already. This makes it the first event I've ever been totally ready for well ahead of time

AbsurdiTi has treated me well in 2019 including getting 3rd at the bigger combat event in South Korea and winning the last bot brawl event. With this success I think this could be the last set of revisions for it to make it just a bit better. I redesigned the weapon hub to use bigger bearings that should not only be more durable but be more rigid. I got these made by EngineeringNetwork and they turned out beautiful. I probably slightly over toleranced the bearing and rotor bores, all being 0.0005" or smaller, but the parts all went together beautifully. Dealing with Dave was a breeze and met the needed delivery date after I dropped the ball in getting these made. Getting them anodized really gives them a quality look and I look forward to seeing how they work.




Since I was getting some waterjet cutting done I decided to try a different weapon bar material and got 2 different designs cut. I still had to grind them to thickness to keep the weight reasonable but they sure look good. I opted to try a single tooth design as well as a similar design to what I've previously ran. With over 130g of spinning mass at well over 10k rpm I figured single tooth would be the way to go to get the big hits and I made the symmetrical bar a bit lighter for when faster spin ups are needed. I made the last bar a bit soft to make sure it didn't fail given I only made 1, but these are right around 50hrc so should take hits from ar500 weapons better as A2 in the low 40's didn't like that much.



The last change is the frame itself. The new weapon assembly needed a couple small changes to the frame but otherwise it's basically the same as the last version. I got a bunch of spares ready to go so I think it's just about all ready now. With all these revisions and given how the last couple events have gone I've got high hopes for motorama, but when you show up to the biggest event in North America nothing is guaranteed.



Llama Sheen has also gotten a slight bit of attention. I've been testing a lot to make sure turning it us is safe so it's got well over double the power now. I've also tweaked the fork design with the biggest change being to the tips. I'm hoping the wider tips will prevent them from doing woodworking once the floor gets beat up a couple fights in. Even though I finished 2nd last year this year won't be easy. Lots of teams have really been steeping it up so I'm sure winning rounds won't be easy. I've got a lot more time on the bot now (I finished it the morning of the first fight last year) and like the tweaks so I think it's all ready to go. With the big MaxAmps pack in drive I definitely shouldn't be losing the first fight for running out of battery like last year. Llama is now a year old after a year of design/building, so I hope that these slight tweaks really make it shine after having 0 time on it before its first event.

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Progress Reports / Re: Team Brain Damage
« Last post by rcjunky on January 08, 2020, 07:08:53 pm »
The event certainly sneaks up fast. I'm in school now until early March so I needed everything done by last weekend, I'll throw an update up here now. I definitely think going to the AR was a good idea, since heat treating something like the 4130 would have been mega risky. Its good to hear it held up pretty good. I look forward to seeing it spin more this year ;)
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on January 07, 2020, 10:17:59 pm »
My mcmaster order came in today and I heard back from the shop that my aluminum frame parts are all done. They should arrive UPS tomorrow.  Tonight in the shop I took the plastic cover plates and detachable teeth off of the shell and spent a little time organizing the shop. I have a box of crap for each of the last three competitions of spares and materials that didn't make the cut when I was packing, and it's time to pay off a little of that accumulated debt.  For now I just moved them out of the way... which is why I have accumulated them.

Tomorrow when I get home from work I need to clean up the shell - grind off the top tooth holders, a split weld at the top of the shell from the last fight against Don, and strip the paint off to make welding the new holders and filling that hole a bit easier.  I'll send the shell down to the shop tomorrow and hopefully get it back next week some time. Almost all of the real shell damage came from the last couple of fights where it wasn't spinning. I think if I can fix that it should be very sturdy. Even with the hits it took it held up remarkably well. That AR400 is tough stuff.

While waiting for that welding work I'll be working on the updated frame blocks. A buddy at work is 3D printing a jig that should help me make the three pairs of parts more accurately. I've never done that before so I'm just kinda winging it. Basically I printed a shell that goes around the stock and has holes in the right places. The holes are oversized and I'm going to add in some bushings I make on the lathe to help align the drill bits. It'll kinda look like an iron maiden while I'm doing it.  He's also 3D printing a sample power switch body so I can test the fit. I won't be using a PLA version in an actual combat bot but I want to make sure I can actually assemble it and that the clearances are all ok before I go to the trouble of milling three of them out of UHMW.

-Zac
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