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 broken ground on SHRED

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Dan Curhan
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PostSubject: broken ground on SHRED   Thu Jan 21, 2010 2:32 am

today was my first big battlebots day working in the roboclub machine shop at school. I didn't do much first semester, and got Conundrum ready for GCRS4 over break, but I'm back in gear. I spent NINE HOURS in the shop today.

I've finished the drive motor mounts, the hubs for the wheels, and both supports for the weapon, as well as the weapon motor interface. Making progress. :]






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PostSubject: Re: broken ground on SHRED   Thu Jan 21, 2010 11:49 am

looks good, is that a broken tap in the 5th picture? if so what size
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Cody
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PostSubject: Re: broken ground on SHRED   Thu Jan 21, 2010 3:10 pm

haha he droped it with the tap and handle in it and it broke
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Will Bales
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PostSubject: Re: broken ground on SHRED   Thu Jan 21, 2010 7:27 pm

hahahahahaha done that before
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PostSubject: Re: broken ground on SHRED   Thu Jan 21, 2010 8:51 pm

Where did you find 9 hours to spend in the shop?!
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PostSubject: Re: broken ground on SHRED   Thu Feb 04, 2010 3:13 am

At the expense of a Nature of Language assignment due tomorrow that I haven't even begun, I spent another 8-hour session in the shop. I was working on the disk this time. I started with a BIG chunk of aluminum. Probably 3 pounds. It's down to a little over a pound. I'll put pictures up when it's done. It's not quite there yet...

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PostSubject: Re: broken ground on SHRED   Thu Feb 04, 2010 10:59 pm

ahh.. another great life choice made in the name of robotics.
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PostSubject: Re: broken ground on SHRED   Fri Feb 05, 2010 9:34 am

yep. as was this:

calculus exam today. I hadn't studied for it. Got back from the shop at midnight. I was up until 3:30.
hmm....
lol

but I have stuff to show for it!





the design is slightly different from my model... :]

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PostSubject: Re: broken ground on SHRED   Fri Feb 05, 2010 9:52 am

Looking good Dan !!!

So...who's gonna drive this one?

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PostSubject: Re: broken ground on SHRED   Fri Feb 05, 2010 10:58 am

i wonder if you could have offset the disc over the motor
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PostSubject: Re: broken ground on SHRED   Fri Feb 05, 2010 2:57 pm

I may have been able to, but I would have had to step the entire hub of it over by a bit... and then the force would be a torsional (?) force on the bearings... more of a moment than I would have wanted. As it is, I'm offsetting the teeth by 1/16" to the side of the motor, so they'll overhang by 1/16 on the non-motor side and 3/16 on the motor side. Not much of a difference, but still. I was gonna do belts, but I opted for this so there was a little more logical space for components.

I'll make a few more hours of progress tonight... I think I'm gonna cut the carbon fiber front guarding and mount it. The teeth should be done in a few days (wire edm cut chisel tips). I'm also going to do something to ensure concentricity of the the motor and the disk. Not 100% sure what though yet.

I'll keep the updates coming cheers

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 2:55 am

my bot is coming together! I'm getting exciteddd! bounce


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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 4:34 am

Dan...you're killing me... affraid

I always joke about a 15 pound bot with a 14 pound weapon....well you've done it...hahaha

A 1 pound bot with a 3/4 pound weapon.....

So ...who's gonna drive this one at Moto? and little conundrum?

Wild man at work!!!! looks nice... bounce

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 1:10 pm

looks cool, but the motors (even the drive) will probably break on the first epic hit. There is a lot of overhang. I know there is not much time left before moto, but I would really recommend trying to put the disk over the motor ala charles. He put up a nice instructable on how to build brushless motors.
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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 1:50 pm

I'm gonna hopefully be able to drive both...
The motor isn't actually attached to the disk - it's a keyed interface with a little bit of play, so it's not too bad. I would have tried to embed the motor in it, and I'm not entirely sure why I didn't, but we'll see what happens.

The disk needs to lose about 80g (should be really easy, but still needs to be done). I think I can take about 20g out of everything else. I should order a lighter battery...

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 5:14 pm

The rules clearly state that only ONE driver per bot in the same weight class...you could drive an ant and a beetle, but not 2 ants.

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 6:00 pm

In the NERC rules?
Ive never read them
I know some competitions you can drive two some you cant, I wonder who gene has drive?
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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 8:32 pm

ahhh crap.... pale
just realizing this, hey Dan ill let you drive my drum if you let me drive yours Very Happy

wait that still dosen't work, all well i'll figure something out
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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 8:44 pm

I specifically asked Al or Jim, cause I have the 2 3's and maybe 2 12's and that's what they told me....if they let you guys each drive a pair per class, that would be unfair....no?

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 9:50 pm

does that mean that every bot needs a dedicated driver? So if the one of mine that i was driving gets eliminated, there's no chance of me driving the other? Neutral

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PostSubject: Re: broken ground on SHRED   Sat Feb 06, 2010 10:26 pm

Dan Curhan wrote:
does that mean that every bot needs a dedicated driver? So if the one of mine that i was driving gets eliminated, there's no chance of me driving the other? Neutral

I would address that directly with Jim or Al..but I did hear that they were somewhat flexible or lax in some areas.

Post on the nerc forum at rfl...I feel the same way, that's why I recruited Josh....if your dad isn't going, you might want to recruit him or someone like him, in that we have no ants and he might be there on Friday, which is when the ants fight.

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PostSubject: Re: broken ground on SHRED   Sun Feb 07, 2010 3:41 am

Dan

I just read the rules again...not very long read

Only 1 driver per bot....also, possibly of interest is that they claim that ant fights are only 2 minutes long...so you may be able to save a bit there, battery wise...

You really should go read the rules at least once....

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PostSubject: Re: broken ground on SHRED   Sun Feb 07, 2010 11:34 am

i did last night, and sent Jim an email. I'm eagerly awaiting his reply. pig

I need to buy a different battery. Maybe the 430 mAh one I used in Conundrum at GCRS? I could buy another one of those. I'll look online for other options. I can definitely get away with a smaller battery - the one I was weighing stuff with weighs 47g!!

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PostSubject: Re: broken ground on SHRED   Sun Feb 07, 2010 4:10 pm

If you end up desperate I got no bots of my own to fight thanks to my advisor, I was planning on driving up to watch anyways...
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PostSubject: Re: broken ground on SHRED   Sun Feb 07, 2010 7:49 pm

sounds good :]
thanks!

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