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 1 lb drum bot!

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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Mon Jun 08, 2009 9:58 pm

i am so mad! I screwed up the other one of these...


there's like three hours of machining in each of these, and i measured WRONG damnit.
guhh. anywaysss these are the front shaft clamp blocks. 7075-T6. 1.275 x .5 x .5
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PostSubject: Re: 1 lb drum bot!   Mon Jun 08, 2009 10:28 pm

a good piece of material gone to waste?

We use mastercam and solidworks and cnc most stuff....if it can't assemble in sw, then we don't cut it.

12 days till barf and we have 2 bots that we are waiting on parts for BEFORE we cut anything...hope we make it

the sabretooths arrived and weigh 45 grams each, not 32 as advertised at rmp!!!

That'swhy we don't cut anything until ALL the components are in hand, measured and weighed.

13 grams is a lot in a little bot....lol
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Mon Jun 08, 2009 10:40 pm

yeah it is! comment on the rmp page and tell them that it's 45 not 32.
i wish i could cnc stuff, but i have no cnc. it's ALL manual. Everything we've ever done has been without any cnc work. i'm hoping i make it to barf lol. hahahaha quote me on that one. Razz
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PostSubject: Re: 1 lb drum bot!   Mon Jun 08, 2009 10:44 pm

Dan Curhan wrote:
yeah it is! comment on the rmp page and tell them that it's 45 not 32.
i wish i could cnc stuff, but i have no cnc. it's ALL manual. Everything we've ever done has been without any cnc work. i'm hoping i make it to barf lol. hahahaha quote me on that one. Razz

I did comment, but it takes 48 hours before they approve it or not

I called dimension tech (manufacturer) and they said ...duh

So I ripped off the alu heatsink and the screw terminal blocks...I'll hardwire to the board (which also avoids screws loosening) and heatsink the board to the bot....somehow??? Ti makes a good heatsink....the sabre now weighs 28 grams...lol...same as a scorpion
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 12:01 am

it's not really that great a heatsink anyways lol. The one on the 25A version's pretty good, but the others seem kinda pointless (and AND we shorted one out once because it got slightly squished and the pins on the bottom of the board shorted on the alu cover... I always take it off and put electrical tape between them then put it back on now.

here are some more photos of parts that I've finished. The drum is done, BOTH front blocks are done, the weapon motor pulley is done, my order went out today for the shaft, bearings, top plate and some screws. Hopefully (since McMaster-Carr is AWESOME) it'll ship and get here tomorrow or thursday. I bought the big block of aluminum for my frame. It's not 6061, or 7075, or even 3000 series. It's not 2024 either. It's 2099! (read this!!) Alcoa innovation won the prestigious R&D 100 award for developing this aluminum-lithium alloy for use in the aerospace industry (in 2006). It's really hard to find - I couldn't find ANYWHERE that sells it online, but when I went into the Alro Metals near me, they had this big chunk of it that was the perfect size for my frame! I'm really excited. :]

Okay. So. photos...

the drum in relation to my hand:


the drum next to the front corner blocks:


(this one's for sean) my magical dantastic curhan wheels:


anddd just for kicks, I laid out all the stuff that I have:
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 12:08 am

Aren't little bots cute???

Don't forget that you need a switch or master plug and a LIGHT to show power on...rfl rules...waaaa baaaah

Looks good so far

what's the drum weigh?

and what size shaft and bearings?
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 1:05 am

the drum's on a 3/8" 7075-T6 shaft with 7/8" OD bearings.
I don't have a switch yet, but it's next on my to-do list lol.

and yes. my girlfriend wants to paint it pink and put little bows on it because it's so cute. I won't let her anywhere near it. Razz
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 1:57 am

don't forget the LIGHT...or you might fail inspection ....lol
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Cody
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 2:42 am

some events will let you get away with using the LEDs on the esc if its visible
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 3:45 am

that's also what i was thinking if i can place the esc where it can be seen
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Sean Rubin
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PostSubject: Re: 1 lb drum bot!   Wed Jun 10, 2009 8:47 am

That robot is dantastic. Just pure magic.
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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 12:34 am

I spent the last five hours machining the two end caps for the drum - and they're not quite finished. I still have to put them in the milling machine and drill two holes in each, and then (WITHOUT A ROTARY TABLE! Evil or Very Mad ) match the curve of the drum on the sides of the part... It's gonna be fun machining that one lol. scratch



all the mcmaster stuff came today, it all looks good. The TinyESCs also came, and they really are tiny lol. hopefully they work. Razz

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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 1:15 am

I received the sabretooths and they suck so far...

the motors keep turing no matter what I do....and then the forward / reverse stopped working it only turns???

Plus what's the use of a flip steering, we need a flip forward/reverse...

I tried everything and they just don't work...back to the drawing board and probably some scorpions at twice the price
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 1:24 am

there are a whole bunch of dip switches on the board. Have you read about what they all do? You need to get the right combination to get it to do what you want. I'm surprised that you're having problems, because they worked great for us. :/

Try rebinding your receiver, to reestablish your failsafes and stick ranges. Then make sure the trims are set right on the controller. Are you driving mixed?
http://www.robotmarketplace.com/products/images/Sabertooth2X5RCQuickStart.pdf

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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 3:31 am

yes mixed...there isn't that much to it, so ???

I've tried everything....I'll call them tomorrow and see what they say
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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 11:30 am

hmm... sorry for a not-so-great recommendation... scratch

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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 11:35 am

Actually at the moment, it's not that bad...

I did an Inet search and it seems that you MUST turn radio on before receiver or receiver puts out bad info and the esc thinks that wot is neutral..lol

so when I was playing with it , binding, d/r etc. the esc was going friggin nuts...neutral was wot...baaa haaaa

at the moment, only 2 problems remain

1) motors creep, but only sometimes
2) turning off transmitter doen't stop the bot if it's moving

also, reversing the steering is fine with the flip, but how about also reversing the drirection of the bot as well??

I might be missing something there, so I still have a call into Dim.Eng

Thanks
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 3:14 pm

as for the steering reversing, we had a similar problem. It was solved by some combination of reversing one motor's leads, and changing a switch setting - i think. If you keep trying at it you'll get it. It will work! I promise! What receiver are you using?

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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 3:22 pm

br6000

I just got off the phone with Tom from DE

At this point I'm trying to send them back...motors keep creeping unless you use their exponential and the whole system becomes sluggish

Too many problems for me and and Tom says no way to reverse direction and steering with flip switch and a bunch of mumbo jumbo about the BR and Spektrum, so it's over for now

It was working great for a while (with limits(, but then without changin anything, the motors started to run away...lol

NOT a good thing with a combat bot
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Cody
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PostSubject: Re: 1 lb drum bot!   Thu Jun 11, 2009 4:39 pm

usually makes for a good story though haha
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PostSubject: Re: 1 lb drum bot!   Wed Jun 17, 2009 3:27 pm

annnnddddd???!
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PostSubject: Re: 1 lb drum bot!   Fri Jun 19, 2009 12:10 am

well. things are getting exciting for me here...

I have decided to name this little 1 lb project Conundrum.

With everything put together and running except the weapon and the top armor I'm 20 grams over. I need to take out 20 grams (plus whatever the top armor and belt weigh). Ew. It's hard because everything is so compact already. BUT I GOT IT TO DRIVE TODAY!! The battery wasn't charged, so it's kinda just hobbling along, but it moves!





That's the front of my frame

I had to remake my motor mount because my original plan isn't going to work... :/





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-Captain of Copperheads 2 to pi, mastermind of the Dethinator, Creator of Conundrum, and Sultan of Shred. Heh. Sultan of Shred. It's kinda catchy... I like it!
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PostSubject: Re: 1 lb drum bot!   Fri Jun 19, 2009 1:21 am

Really cool !!!

Your bot is as big or bigger than our 3 pound bots.....hahaha

Get her done

Are you taking it to BARF this weekend?
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SenaiERI
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PostSubject: Re: 1 lb drum bot!   Fri Jun 19, 2009 1:25 am

Awwww. Look at da wittle wobot. It's such a wittle cutie patutie.
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Fri Jun 19, 2009 8:35 am

i'm going to try and finish it today... i don't know though. Either way I'll probably show up to BARF anyways (with copperhead in my trunk for shits and giggles).

I've been driving this thing around a little bit, and one drive wheel has always spun better than the other, which I've kinda had to coerce into spinning... and now it doesn't spin at all. I think I may have pulled too much current through the ESC and fried it, but I'm not sure. It felt really hot at one point... :/

POO!
Sad

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-Captain of Copperheads 2 to pi, mastermind of the Dethinator, Creator of Conundrum, and Sultan of Shred. Heh. Sultan of Shred. It's kinda catchy... I like it!
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