King Cobra - Team Aurora - NSW Goto page 1, 2, 3 ... 59, 60, 61Next
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Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
King Cobra - Team Aurora - NSW
well all is looking up.
got the 60amp fet for the weapon and am still making that up. the IBC will fire it off in place of a relay for space reasons.
the batteries are going to be one 2.3ah slas for the drive and 1 for the weapon although on availability the weapon will be run from 24v 3000mah nimh packs.
weapon will get made get laser cut as it seems at the mo and should be about 220mm diameter and 1800-2000g weight.
weapon motor still needs to have the fan assembly taken off but im pretty sure its a series motor. will test it tommorow.
Last edited by Glen on Mon Aug 15, 2005 6:00 pm; edited 1 time in total
Sun Jul 11, 2004 4:15 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
andrew got that fan case off today, thanks for that.
well the motor is not a series wound as i suspected its a PMDC. but its very efficient, when you stick a wire from it straight on to a battery it barely sparks - as opposed to a drill which sparks all over the shop. should have some kick at 24v.
the 9.6v drills have been modified to go into cobra. although the gears on the 9.6v drills are higher up on the shaft than the xu1 drills. so nfi how that will work out. hopefully well.
also got the batteries back and ill get about 2 more sets before the event.
still waiting for a qoute on the laser cutting..
got the fet activator half done.
still have to get another LED grrrr.... apparently they dont go off 5v
ill be shopping for the aluminium section soon, but im after the same stuff nick had on minotuar 1.2's hammer (whered you get yours from??) _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Mon Jul 12, 2004 5:34 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
still toying with designs and placements etc in cad.
the horizontal option doesnt look really appealing any more as fitting it all into 80mm of height with such a big motor looks extremely hard.
the vertical option on the other hand looks a lot easier. basically if i have the same weapon spinning vertically in a swinging pod kind of thing i can fit it in no sweat.
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
I had to buy 4 meters from O'brien's Aluminium and have HEAPS spare... Any offers accepted! _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Mon Jul 12, 2004 10:43 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
a paper clip and some pocket lint .
nah name your price and ill grab some from you, (might also recruit your services to see what the speed and current on my fan motor is sometime as well).
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
finally got a 12v bezel LED, couldnt find them anywhere.
also took the little box sans hammer for a test run, this thing hoons around without the big arm out the back! 9.6v at 12v makes for a good little drive, also has alot more push despite the lower voltage.
the whole weapon system is getting redone, that big motor just wont go in effectively. so ill keep that for a future project and move onto a flat plate motor that i can fit in, means the pulley and mounting of everything can be simplified.
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
moved the LED to one of the brackets that hold the lid on so i can see it without having to stick my head down near the robot which was totally unsafe.
also got the entire thing put together ready for a drive on the 24th. ill stick a little temporary castor on it for then but it should give you a good slammin _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Thu Jul 15, 2004 9:57 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
note i have been talking to brett and it seems the ibc may be doing some oddness and clipping the voltage into the bot, may mean that the fet setup will "hover".
there is a workaround but it aint pretty. (taking pins off chips)
(this is only a problem over 12V or so.)
i'll let you know of an update next time i speak to brett.
Fri Jul 16, 2004 12:52 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
thanks for the heads up jake, ive got a single servo ill hack up now to make a fet driver.
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
got that led in which proved rather difficult, required pulling half the robot apart and some nifty dremel work which was a bit more than anticipated lol.
in taking one of the side panels off the front panel decided to spring out with some fierce power which was a hell of a surprise, theres a pic in the album but its pretty bent thanks to plan b and annihilation.
well now its all working for the builders meet, only needs a temporary castor to stop it dragging.
i want to see how long the batteries last so if you would care to nick maybe we could have a leisurley pushy fight? _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Jul 16, 2004 9:11 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
got the plans for the disc all wrapped up, just a normal old 200mm disc of 6mm steel.
the disc alone weighs about 1.4kg which doesnt include the mass of the teeth and shaft so it should add up to something like 1.8kg spinning
got the DFX file and have sent it off to the water jet place so hopefully i can get the thing cut for less than $30-40.
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
bah well it seems cobra just wont let me put a disc onto it.
so many troubles with the design now:
* mainly in that the weight table says the weight is 12.9kg and thats without the welds and so forth so i suspect it will be over weight.
* there was no way i could physically condense it all into 80mm of height without the bot being non invertible. im not spending that much money on a robot with it having such a huge flaw as that.
* the frame would be so incredibly weak at 10x10 steel box section and
* the clearances where ridiculous, like 2mm between the disc and A frame.
so this version of cobra is getting the 2x 2.3ah SLAs in parallel for 4.6ah of battery life. getting the tread back on again as well as the old wedge but with a few mods so it can wedge and still drive around. with 9.6v at 12v there wont be any gearbox or motor troubles even with the tread so it should be a trooper and a half now.
so on to new robot same as cobra but with a thinner metal base instead of lexan and welded 6mm aluminium frame. the weapon motor will sit between the drives so it will be about 40mm wider and the same length. this thing should be ALOT more servicable. no getting your hands wedged in things to get something off etc..
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
well cobra went very well today at the builders meet.
it managed to push basilisk and with the tread on pushed it sideways at considerable speed!
the 9.6v at 12v drives are more than adequate. even when pushing another robot with the treads on the motors where still mildly warm, nothing lethal at all. with the tread the 2.3ah goes flat in only a minute or two but without tread it lasts 3 minutes and more.
still need to put the new wheels on as i stripped one of the old wheels i had on it. apart from that it needs the wedge on the back and a ball castor on the back as well so i can properly wedge people around. _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Sat Jul 24, 2004 6:55 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
well finally got the weight of the thing = 9.1kg
obviously that just will not do for a dedicated spinner killer wedge bot! so im out to seach for some 12mm steel plate to strap to the back to bring it up to 12.1kg
im also seeing if i can jam a lifter into the wedge, but with 2 batteries i doubt it. id rather test the bot i have to get the most from it. _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Sun Jul 25, 2004 9:38 am
Timothy Forde Experienced Roboteer
Joined: 16 Jun 2004
Posts: 247
Location: Vic ,Belgrave South
12mm steel did I read that right? lol _________________ Team KO
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actually looks kewl.
