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Beetleweights and stuff - Team aurora - NSW
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Glen
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Beetleweights and stuff - Team aurora - NSW

well the parts have coalesced enough to call it half a robot now.

basically ive taken all the parts from the old version of cobra (the aluminium one) and put them aside when they are removed from the new version.

at the moment i have -
* the sides and front of the aluminium armour
* the cracked lid to use as a template
* the old hammer arm
* 2x of the old weapons
* the drives including the drills and red wheels
* the first radio
* its old batteries.

soon ill have the old aluminium rear to finish off the frame.

well for the revisions it should be somewhat different. the mounts wont be nicks mounts unfortunately, as i cant justify spending the money on them for a play around bot, so they will be some box section, L bracket and hose clamps.

the batteries will be 4x drill nicads. two in parrallel and then two of these in series for 2.4ah at 24v. so itll be very fast.

the controllers will also have a shoddy switch setup so the radio can be AM, and i should be able to use a steel lid and base as a result.
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Last edited by Glen on Wed Jun 18, 2008 5:54 pm; edited 3 times in total

Post Thu Dec 09, 2004 7:34 pm 
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Knightrous
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I'm sooo going to laugh if this works better then the current version of Cobra Smile Who is going to drive it, your mum, or your sister?
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Post Thu Dec 09, 2004 11:50 pm 
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Glen
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lol wouldnt surprise me, it should weigh only about 7kg, ill be piloting this machine (the old version was easier to drive anyway Smile )
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Post Fri Dec 10, 2004 5:15 am 
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Waddy the phoenix



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lol maby i should make a silver the subordinate nextgeneration evolution thingummywhatzits mk 2
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Post Fri Dec 10, 2004 9:35 pm 
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Glen
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well silver cobra was a retraded idea, now that its frame has been plundered for kang, its drives taken for kang and the rest is in the recent cobra,

so im taking this thread over for beta max Very Happy

well as all at robowars would know we hacked up some old VCRs after they got trashed and removed some damn fine parts, noticably a beauty of an aluminium flywheel that is perfect for a spinner, along with a matching bearing block, pulley, belt and motor with matching pulley.

so its a spinner alrighty woohoo! (little sozbot one). just going to use two cheapo servos on the drive and run it off a 4.8v nimh pack that goes with the radio.

for the weapon ill just bolt some little steel teeth onto the rim of the flywheel, and use it as a disc and also ill use an rf-370 for the weapon. ill probably have to change the motor as the one out of the vcr was running fine off 14.4v, so a 3.6v motor will be appreciated Very Happy
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Post Wed Dec 22, 2004 6:42 pm 
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Glen
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woohoo, clamped all the spinner mechanism which is 100% done into my vice and gave it some hardxxxcore testing.

had the motor running at 24v all through the test, and i think the ratio on the belt drive is 2:1 or there abouts. the disc is about 60mm diameter and weighs about 70g at the moment (say hello 4mm steel teeth Smile)

the mechanism is a 3mm steel shaft, with a bearing block that has 2 bushings inside it, there is also a plastic pulley that butts up against the disc. and the disc itself is solid steel with the guts milled out so its heavier at the edge.

the mech is arranged from bottom to top as shaft/clamp collar/bearing block/pulley/disc. photos soon.

spin up on 24v (thats the rated voltage of the motor im sure of it) is wicked, its less than 3 seconds and i cant measure the speed but it sounds about 3000rpm, which aint *too* fast, but i think this motor is built for torque more than speed.

i dropped some nuts and bolts into the spoked part in the center and i couldnt slow it down noticably, even with the belt flopping all over the place. when the belt is tensioned its really hard to stop with your finder.

ive got 3 videos that i want to show yall but damn that server space shortage.

the drive i dont know about, ive got 4 perfect sozbots drives but no controller, and no servos (they cost like $30 each which almost justifies an antweight ESC...)
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Post Fri Dec 24, 2004 8:40 pm 
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Glen
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replaced the motor with a little high torque 3v motor (same shape as a p9000) thats supposed to be a powerful sucker according to the model shop guy, picked up 4 for $2 so thats not too bad.

rigged it up and the spin up is about 7 seconds to full, but full speed is wicked, its got a really nice hummm to it, and with my new sony mini digital video recorder mwuahah ive got some good videos of it.

i reckon the top speed has gone up into the 5 figure RPM's and this motor works pretty nice to spin up such a big disk. the motor weighs like 20g and quite capably spins up the disk on 12v (yeah a 3v motor on 12v Very Happy) despite the clouds of smoke that billow from it if the belt is too tight.

ill look around for some other little motors, but im still after something with a 40,000rpm output and is cheap as hell.

tommorow ill be bolting on some little steel teeth onto the edge so i can enter phase 2, chucking shat into it Cool
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Post Sat Dec 25, 2004 9:38 pm 
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Glen
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okay so ive got it mounted on a base of 10mm polycarbonate about 50x170 off the top of my head.

the drives are cybot drives mounted up the back of the frame and there is 4x 1.2v 1200mah drill cells tied up on top of the drives.

weapon has morphed today into a twin hyper dash 2 (high wang-factor name for a hotted up p9000) that i think goes 19,300rpm of a 3v battery so at 4.8v and geared down 2:1 it should spin at a hearty 10,000rpm. theres two of the motors sitting one on top of the other with both of them powering the same pulley, like upper limits (one of my fave robots now :p). turned on its side.

the weapon area has gotten a makeover too. the bearing block got mounted, and due to way to much friction between the locking collar and bearings i had to use a tiny nut to go in between the two, spins like a deam.

the pulley was wobbly as hell, because i drilled it wonky at robowars, so i drilled it out a little bigger and straighter and super glued it straight to the shaft and disk so its far more solid.

the little bushing inside the disc was half falling out, so i rigged up a little jig in my vice and used that to push the shaft and bushing all the way into the disk.

the teeth/ nay tooth are a big honking piece of steel bar, 40mm wide and about 70mm long IIRC. bolted on with two m6 bolts. it took about 2 hours of testing and bench grinding to get it to be remotely balanced, but i think i have it now.

the testing ive been doing hasnt been too hardcore because ive been using two p9000's at 12v until i can get my charger back (to charge my 4.8v packs) and its impressive, spin up is about 6-7 seconds and its hard to stall the disc with its huge tooth. its hit my kyosho table racer, thrown it about one meter and knocked the shell and batteries out of it. also took some nice chunks out of a drill battery case and hit a red wheel so hard, the weapon slowed to about 20rpm and the SLA i was using (it was resting on top) jumped off and landed flat on the disk where it shorted the leads and sparks and shit where flying off every LOL.

pics and videos tommorow, when welch and i can figure out how to work this video cam Confused

phew big day today
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Post Sun Dec 26, 2004 8:34 pm 
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Glen
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welch came around today and we gave it a bit more testing. the spin was slow all day which we put down to the end of the motor shaft rubbing on the ground, so we propped it up and got some decent speed out of it.

the motors are only p9000s at the moment, i have to wait to get my charger back so i can charge my 4.8v packs. then ill change over to the 3v versions.

the weapon isnt too good at 12v, it doesnt have that killer blow in it, although its got respectable energy. at 24v its american antweight style, it ripped the top clear off a drill battery case and jumped it up in the air a bit when we had it on its side. welch was too much of a sissy for me to hit it really hard.

so im hoping that i can wring some high energy out of it bwuhaha.

some photos:

http://robowars.org/forum/album_pic.php?pic_id=453

as it stands, all i need to do now for the mechanics is to convert the motors over, cut the front section along those two angled lines and drill the hell out of that little frame to bring the weight down. note the unfinished flame decals :p

http://robowars.org/forum/album_pic.php?pic_id=454

the drives, the most perfect things about. 3 stage gears, perfect speed, power up to ying-yang, and low current. the wheels are really tractile (is that even a word Confused ) and are pretty beefy. i might see if i can replace them with lightflights because they are very heavy.

http://robowars.org/forum/album_pic.php?pic_id=456

the best part of all. the weapon. you can see the two motors all mounted, the belt drive and the weapon itself. the 4mm steel bar tooth is all bolted on, and the weapon is done at this point.

as for the motor and weapon control, looks like itll have to be a home made job, itll have to be tiny so nfi how that will work out :p suggestions welcome.
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Post Mon Dec 27, 2004 7:14 pm 
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Glen
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well the weapon spins at 4800rpm, way to slow, so it needs another 5000rpm at least to do damage.

so ill bung in those hyper dash motors which are supposed to be good for another 10,000rpm on the motors and that should fix it right up.

and if i can find one i want to replace both of the motors with a single speed 280bb which weighs the same about but has a shyte load more power. like three times more power and the same speed.
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Post Tue Dec 28, 2004 3:29 pm 
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Knightrous
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I might have to have a go at one of these things. I think I have some motors kicking around that will work...
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Post Tue Dec 28, 2004 9:08 pm 
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Waddy the phoenix



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question are we being realy realy strict on weight or is it sort of just a kick around thing cause i wouldent mind it being a kick around thing (with in 150g or so) cause i dont have any scales that would come close to as acurate as a crooked aarow so whatta you think with in 150 or 200g acceptable??
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Post Tue Dec 28, 2004 10:04 pm 
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Knightrous
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Sozbots = 464g...... 16 oz
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Post Tue Dec 28, 2004 10:12 pm 
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Waddy the phoenix



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yeah and feather was 12 but we let slide to 12.99 for a few events are we doing that with soz's?? (not as far but a little to play with)
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Post Tue Dec 28, 2004 10:14 pm 
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Knightrous
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I reckon 500g max, that's being fair and stops people using 550's for weapons Cool
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Post Tue Dec 28, 2004 10:18 pm 
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