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 1 lb drum bot!

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SenaiERI
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PostSubject: Re: 1 lb drum bot!   Wed May 20, 2009 11:46 pm

Dan Curhan wrote:
i need to extend the back another 13mm (to fit the battery...

EWWWWWW You use metric.

This is America dang it. We use STANDARD! (said with a red neck accent)

SenaiERI

P.S. Just kidding of course.
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Will Bales
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 12:10 am

lol.. that motor seems a little too large! maybe you should consider switching to an inrunner! higher kv, smaller in general, and there isn't a giant spinning part inside of your robot!
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Jeff L
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 12:15 am

Do you think one of these might work?
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7230&Product_Name=hexTronik_2_gram_Brushless_Outrunner_7700kv
I'm guessing it's a bit too light.

I've just had a brilliant idea: I'm so going to use one of those motors to make a fairyweight out of nothing but bent paperclips soldered together. YES.
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Will Bales
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 12:29 am

lmao I love it! maybe you could armor it with Aluminum Foil!
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donsun



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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 1:40 am

for an antweight,
1 axi and 2 banebots/maxons, all you need is max 600mAh for a 3min match. people have used as low as 350mAh in their bots.

here are the feigao inrunners i mentioned before should you choose to use these over the axi:
http://www.bphobbies.com/view.asp?id=V306434
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Cody
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 2:11 am

pssst use a feigao inrunner there awesome motors
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 10:08 am

OMG! 2 grams! that's ridiculous!
feigao? I've never heard of them, but i like the 30 turn one... and 1.53 oz and an inrunner... easier to deal with lol. And I like the price lol.
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donsun



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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 10:18 am

yea, top ants like Switchblade have used inrunners with good success. Just note that you may need to increase the pulley ratio in order to resolve cogging issues and for it to spin up properly and reliably. Also, on more compact bots, it's probably easier to fit in an inrunner anyways. If you opt to use outrunners, you could consider direct driving your drum with the can of the outrunner pressfit into the drum such as McPeePants and Yelo
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Thu May 21, 2009 12:57 pm

i stuck an outrunner in the drum of a 15 lb bot i designed... Razz
and I wasn't planning on spinning the drum at 20k rpm, more like 6 ish. so i'll definitely improve the startup torque by reducing the ratio. hmmms... back to the re-drawing board to switch the motor lol
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Sun May 24, 2009 2:21 pm

I'm actually gonna buy the feigao inrunner, but I don't know whether to get an ESC from that site or not. Apparently it saves me some money, but I'm not sure which to buy. If the "max amps" on the motor is 7A, then a Castle Thunderbird-18 should work, right? And I'm trusting the castle brand cause that's what people say they use... I feel so inept at all this brushless stuff... I know 120 lb stuff so much better lol
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Cody
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PostSubject: Re: 1 lb drum bot!   Sun May 24, 2009 5:21 pm

Sorry about earlier dan but my power went out Mad
Alex finally got back to me and said it would be fine also.
Are you still planning on two weapon motors?
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donsun



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PostSubject: Re: 1 lb drum bot!   Sun May 24, 2009 8:14 pm

the thunderbird-18 will be perfectly fine as cody/alex confirmed. and I doubt he'll be needing two motors in an antweight, almost any brushless motor is over kill in the antweight class.
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Cody
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PostSubject: Re: 1 lb drum bot!   Sun May 24, 2009 9:36 pm

He ordered a feiago 130 short can, seemed a little small to me but i dont know much about bug bots lol
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Sun May 24, 2009 11:53 pm

the weapon weighs .31 lbs... for whatever that's worth lol.
Still working on my internal layout... I haven't had much time to re-draw things with the feigao motor.
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Will Bales
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PostSubject: Re: 1 lb drum bot!   Mon May 25, 2009 10:41 am

you might even be able to use a smaller ESC. I'm thinking that you only need the Phoenix 9, but maybe we should ask our very own, Castle Creations Representative! lol
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Tue May 26, 2009 11:53 pm



this is what i've got. it's really tight inside. REALLY tight. holy crap! but it should work. If not, I just need to machine another frame that's longer... it's one piece so it's not TOO big a deal. Razz

a revised parts list:


What speed controllers can I use for the drive system?? The sabertooth is awesome but it's just TOO BIG!
I was looking at the banebots 3-9 ESCs. Are these recommended?

And the battery, I'm really restricted size-wise so I found one that fits. It's 800 mAh but has discharge of 6.4A cont. and 9.6A burst. I think this will be enough since the weapon motor has a max current rating of 7A.

This is looking good! I'm excited to build it! I ordered the feigao motors and thunderbird-18 escs a few days ago and they shipped today so i've taken the first step in building this! bounce
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 12:17 am



i had to extend the back of the frame another 1/4 inch to get the speed controllers to fit. The banebots ones slip in nicely behind the battery. They're yellow. Razz and the blue thing is the thunderbird esc. When placed directly on top of the drive motors, it fits and leaves less than a sixteenth clearance above it for the top piece. this is AMAZING. I'm ecstatic. and the best part?



0.958 lbs.
that's totally doable.
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 12:50 am


just some more screenshots...

solidworks won't let me add the bolts in where there are holes for them in the back corners, and on one of the front clamp blocks!! arghh! Evil or Very Mad

like i click smart fasteners, but it won't even let me select those holes. i don't know why...

anyways... DONE.
0.978 lbs.
all components accounted for.

I'm gonna do a fancy render lol
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Cody
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 1:44 am

when do you think you'll start machining? im excited to see how this turns out!
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 1:53 am

haha i'm excited too!
bounce

i'll probably start machining next week or the week after... then it's just a matter of time until all my parts show up. Razz
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Cody
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 2:07 am

are the allen head screws in the front blocks what its gonna be running on?
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 2:13 am

no... see the tapped holes in the front blocks? right in the corners of them? those will have bolts in them sticking out far enough to run on. I might even make like a uhmw runner cap that plugs the socket head and acts like a slider...
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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 2:20 am

well my solidworks photoviewer is not working and it's making me angry, so i got autodesk showcase, and converted the solidworks file, and rendered that... and it's badddd Sad

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Dan Curhan
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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 6:59 am

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donsun



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PostSubject: Re: 1 lb drum bot!   Wed May 27, 2009 8:05 am

unless you already ordered your banebots 3-9 esc's I'd also recommend these: http://fingertechrobotics.com/products.php?cat=9
they're a bit smaller than the banebots and have the same functions. I've read good reviews about these, but I use banebots 3-9's since mine from a while ago still havn't burnt out.
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