| 1 lb drum bot! | |
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+7donsun Jeff L SenaiERI Will Bales Cody Alan Dreher Dan Curhan 11 posters |
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SenaiERI mega contributor
People Skills : 5967 Registration date : 2009-03-15 Location : Dallas, Tx
| Subject: 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 ULTRA contributor
People Skills : 6173 Registration date : 2009-03-15 Age : 31 Location : Miami, FL
| Subject: 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 Minister of Silly Walks
People Skills : 6585 Registration date : 2009-03-14 Age : 35 Location : Miami, FL / Atlanta, GA
| Subject: 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 ULTRA contributor
People Skills : 6173 Registration date : 2009-03-15 Age : 31 Location : Miami, FL
| Subject: 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
People Skills : 5544 Registration date : 2009-04-30 Age : 33 Location : Ridgewood, NJ / Atlanta, GA
| Subject: 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 2000+ club
People Skills : 7822 Registration date : 2009-03-16
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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
People Skills : 5544 Registration date : 2009-04-30 Age : 33 Location : Ridgewood, NJ / Atlanta, GA
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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... 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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 2000+ club
People Skills : 7822 Registration date : 2009-03-16
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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 ULTRA contributor
People Skills : 6173 Registration date : 2009-03-15 Age : 31 Location : Miami, FL
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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. 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! | |
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Dan Curhan Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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. 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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! 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 2000+ club
People Skills : 7822 Registration date : 2009-03-16
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: Re: 1 lb drum bot! Wed May 27, 2009 1:53 am | |
| haha i'm excited too! 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. | |
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Cody 2000+ club
People Skills : 7822 Registration date : 2009-03-16
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: 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 Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
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Dan Curhan Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: Re: 1 lb drum bot! Wed May 27, 2009 6:59 am | |
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donsun
People Skills : 5544 Registration date : 2009-04-30 Age : 33 Location : Ridgewood, NJ / Atlanta, GA
| Subject: 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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Dan Curhan Admin
People Skills : 6377 Registration date : 2009-03-14 Age : 32 Location : Sarasota, FL
| Subject: Re: 1 lb drum bot! Thu May 28, 2009 8:34 am | |
| i haven't ordered the banebots ones yet. great recommendation! I had to extend the back of the frame a quarter inch to fit the banebots escs but now i don't have to!! and they're light! my assembly weighs .932 lbs which gives me plenty of wiggle room for wiring! I'm done!!! I'm done!!!! i'm ecstatic because this works!!! I'm gonna start ordering more parts soon. :] | |
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Will Bales ULTRA contributor
People Skills : 6173 Registration date : 2009-03-15 Age : 31 Location : Miami, FL
| Subject: Re: 1 lb drum bot! Thu May 28, 2009 12:14 pm | |
| OKAY THEN! since Finals are done, (2 hours ago!) I'm going to design an ant! we'll se who wins this round.. | |
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