Author Topic: Team Brain Damage  (Read 61222 times)

zacodonnell

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Re: Team Brain Damage
« Reply #420 on: January 05, 2020, 10:01:43 pm »
Motorama is a-coming and I'm getting going too. I just finished the design work for the next update to Hyperpolarized.  I don't have time to do much of a write-up tonight but I did put up the initial render:

https://imgur.com/a/qTwNkMq


Hope everybody else had a good Christmas and the work is underway for other builds too. I just ordered the first batch of parts from mcmaster and the machine shop so it's officially build season for me.

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #421 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

rcjunky

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Re: Team Brain Damage
« Reply #422 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 ;)
Andrew Burghgraef
Canadian Carnage Robotics

zacodonnell

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Re: Team Brain Damage
« Reply #423 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

zacodonnell

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Re: Team Brain Damage
« Reply #424 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
« Last Edit: January 11, 2020, 08:56:14 pm by zacodonnell »

zacodonnell

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Re: Team Brain Damage
« Reply #425 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

BranYoung

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Re: Team Brain Damage
« Reply #426 on: January 18, 2020, 09:09:48 am »
Not a bad idea! I assume UHMW body and all those holes are to mount right onto the frame?

zacodonnell

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Re: Team Brain Damage
« Reply #427 on: January 19, 2020, 10:05:08 am »
Yep, the holes are for mounting to the frame and mounting the cover plates that go on either side. The cover plates isolate the guts from the frame, but I guess if your frame was plastic you could save some width and skip one side. I considered just doing shrinkwrap to keep it as thin as possible but ultimately I had the space and felt better with real covers.

I spent all of last week on a different project that I'll list on here when it is in demo ready form. Today I'm heading back down to the shop to wrap up the power switches and start working on the frame transplant.

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #428 on: January 23, 2020, 10:58:44 pm »
Lots more progress in the last couple of days. I got the power switches done, the frame corner blocks done, and started in on some of the frame assembly. Next up is the other side of the battery box / weapon motor mount and then it is time to transplant the existing frame over. If I can focus on it this weekend I should be able to get the bot up and running



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

-Zac

rcjunky

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Re: Team Brain Damage
« Reply #429 on: January 24, 2020, 01:49:34 pm »
I'm curious to hear how those switches work out for ya. Any plans on labeling them with something fancy like custom stickers?
Andrew Burghgraef
Canadian Carnage Robotics

zacodonnell

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Re: Team Brain Damage
« Reply #430 on: January 24, 2020, 10:06:40 pm »
More progress tonight. I got the new frame rails finished, wiring guards added, and made sure the corner blocks fit. The plastic I have for the hoops is a bit undersized so I'm going to have to shim it out slightly. No biggie. I started in on the wiring disassembly and will do the mid plate transplant and drive motor reinstallation tomorrow.



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

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #431 on: January 26, 2020, 10:47:46 pm »
Lots of progress this weekend. I got the mid plate transplanted and everything reinstalled. I even got the bottom plate done and all the new wiring finished. All that's left is to trim the skids down a little bit and give it a test. I didn't want to do it when it was too late in case it went badly and I didn't have time/brainpower to deal with it. It's very hard to just walk away when you're this close...








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

-Zac


zacodonnell

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Re: Team Brain Damage
« Reply #432 on: January 28, 2020, 10:23:26 pm »
I got back down to the shop tonight, installed the batteries, trimmed the skids a little bit, and took the bot for a test run.

https://www.youtube.com/watch?v=FS-2IRfn6lw&feature=youtu.be

It definitely spins better than the old version, but the idler didn't survive the test. It still moves freely but the tread was destroyed. I've got some harder wheels (black tread) coming Thursday that I think could hold up better, but I'm also going to replace the bearing center post with a tighter tolerance one. I hope that helps the vibration a little. As much as I enjoy the intimidating sound, it needs to be a little more stable. 

The drag is less bad than it was in the old version, but there still is some. I have a gyro that I could install but there isn't space in the bot for it and I worry about adding something like that to the system as a single point of failure. I'll get it working without as much as I can and see how it goes.

Pictures:

https://imgur.com/a/qTwNkMq

-Zac

rcjunky

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Re: Team Brain Damage
« Reply #433 on: January 29, 2020, 03:26:39 pm »
With the idler, why not make it uhmw? it does't need any traction beyond enough to spin the bearing instead of melting a flat spot and could have some cushion if needed over say aluminum, and would be lighter most likely. Looks good so far and you've got 2 weeks to polish up the final details.
Andrew Burghgraef
Canadian Carnage Robotics

zacodonnell

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Re: Team Brain Damage
« Reply #434 on: January 29, 2020, 10:34:55 pm »
I tried small UHMW last year and it annihilated the bore. With the bigger space I might be able to make something work but it needs to reliably retain the bearings too so having a metal hub with a tight press fit is important. If I'm gonna go that far I'll just make it out of the same as the main roller and be done

-Zac