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Messages - zacodonnell

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481
Progress Reports / Re: My bots, bodged or otherwise
« on: February 12, 2015, 06:29:31 pm »
Ash's parts have been cut and are on their way:



The mounts for Ash look like they have a little more meat around the weapon shaft than necessary (especially above it).  Are you planning to use that extra material for something? If not, you could probably save a lot of weight there.  The bot is SO SHINY

-Zac

482
Progress Reports / Re: Massacre & Friends
« on: February 12, 2015, 06:27:32 pm »
Don't forget wheel hubs and pulleys! The reason I got mine originally was so I could make easy wheel hubs and adapt pulleys for my robots. It's so liberating to be able to open up the bore, take off the pulley hub, or make a bushing to adapt the 5mm shaft on my weapon motor to a .25" bore stock pulley.

You'll never want to be without one again :)

-Zac

483
Progress Reports / Re: Novarobots: Iron golem 30lb Sportsman
« on: February 12, 2015, 12:30:19 pm »
If it can move it will.

Indeed, and at an unfortunate time as well in my experience. I use a lot of zipties in my machines. It makes working on the parts a bit more of a pain but I've found a hemostat can really make it easier.  I'm always amazed at how much space the wiring takes up.  Iron Golem is looking great. I'm going to have to figure out more hammer resistant armor I think.

-Zac

484
Progress Reports / Re: Near Chaos Robotics
« on: February 12, 2015, 12:24:27 pm »
I thought those connectors on this controller looked a little exposed. I try to "battle harden" all of my controllers by potting the leads in shoe goo and adding shrink wrap / electrical tape around all of the conductive areas. I've broken too many things trying to run wires and jam them in between components to trust the little solder joints to hold.  I may give that controller a shot - it's always good to hear from somebody who has used their stuff before in actual combat.

Bad things happen in robot fighting and arena debris is often conductive and sprayed all over the insides of the bots.  I did have a short to the baseplate in my sportsman last motorama where the heat melted through the insulation on the battery leads.  I have since improved both the insulation and wire gauge. 

-Zac

485
Progress Reports / Re: Twisted Sick Robotics
« on: February 11, 2015, 09:59:09 pm »
This is why robot builders are the coolest people I know.

-Zac

486
Progress Reports / Re: Near Chaos Robotics
« on: February 11, 2015, 07:29:15 pm »
I think self-righting the robot using the weapon would qualify as stalling... and reliability would be the primary reason to switch so picking a controller that shows me out of spec is probably not the best bet. I spent a little more time on their site and found another controller that would fit in my footprint and should be way overkill (my favorite thing for ESCs) though:
http://www.teamtekin.com/rx8.html

It supports up to 6S, leaving lots of headroom. They say 200A but that's probably optimistic in practice but should still be way more than I need.

Thanks for putting me on to them. We'll see how it goes at Moto this year. I want to decide if this bot is going to be a real thing before dropping 200 bucks on a controller for it.

-Zac

487
Progress Reports / Re: Near Chaos Robotics
« on: February 11, 2015, 07:16:37 pm »
The specs on their site say they only go to 3S, or am I looking at a different controller than the one you mean?
http://www.teamtekin.com/rs.html

-Zac

488
Progress Reports / Re: Twisted Sick Robotics
« on: February 11, 2015, 07:14:20 pm »
getting close to the event horizon of not being able to order a backup... Unfortunately I sold my HH BR-XLs - they probably would have worked too.

-Zac

489
General Robotics Discussion / Boston Dynamics "Spot"
« on: February 11, 2015, 06:50:20 pm »
A little off topic from combat but my brother just sent this to me and I was very, very impressed:
https://www.youtube.com/watch?v=M8YjvHYbZ9w

Moving with its own onboard power source, climbing stairs, uneven and loose terrain, and adjusting to external unexpected forces.  That is one cool machine.

-Zac

490
Progress Reports / Re: Team AstroBot
« on: February 11, 2015, 06:48:19 pm »
Excessive use of the Marquee! That's a 15 yard penalty

-Zac

491
Progress Reports / Re: Bone Dead Robotics
« on: February 11, 2015, 06:47:50 pm »
Speaking of the Sabretooth... I just mailed it to Jason H with the Hortinator.  Of course you could always buy one if that is what fits.

-Zac

492
Progress Reports / Re: Near Chaos Robotics
« on: February 11, 2015, 06:46:45 pm »
I'm using this controller:

http://www.hobbyking.com/hobbyking/store/__11743__HobbyKing_Brushless_Car_ESC_60A_w_Reverse.html

The blade is ~5" asymmetrical 20 tooth pulley on the motor and 34 tooth on the blade. I'm running 4S lipo now.  I think it may be an issue with the software sensing the overload in time to save itself.  I'm using it from a dead stop so I expected it to fail to start instead of blowing up, but I've got 2 dead ones now. One just stopped showing signs of life and the other smoked visibly.  They don't even get warm in normal usage. I did remove the fan.

-Zac

493
Progress Reports / Re: Twisted Sick Robotics
« on: February 11, 2015, 06:42:49 pm »
What speed controllers did you order that you are waiting on? I might have a spare that would work for you.  I have a spare ICE 100, HK 60A with the giant heat sink, RageBridge, and maybe one or two other things laying around... Not likely to fit well, but maybe possibilities.

-Zac

494
Progress Reports / Re: Revelation Robotics
« on: February 11, 2015, 06:39:51 pm »
When you say it doesn't work, what does it do? Does it fail to spin at all, spin slowly, get really hot, shoot flames out (I hope not!)?

If it is just spinning very slowly it could be your battery can't source the current you need. two 9v batteries together might be able to source enough for a little while but the 7.4v lipo is more likely to work.  Does any part of the system get hot?

-Zac

495
Progress Reports / Re: Team Brain Damage
« on: February 10, 2015, 03:14:27 pm »
Yep, that's pretty much it.

I did spend some time playing with a spreadsheet to see what I thought might be possible based on different flywheel sizes and speeds. Then I made it as big as my lathe could handle (2.75") and as heavy as the bot could handle (steadily increasing version to version as I thinned other parts down) then I spun it as fast as the motor could handle (ended up about 14krpm in Threecoil)

-Zac

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