Weapons and Counter-measures Goto page Previous1, 2, 3, 4, 5
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Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
I wonder about the practicality of putting a counter rotating disk in there to null out the gyro forces, you can reduce its mass/size if you increase its RPM and if you don't put any teeth on it you shouldn't need uber bearings _________________ Mechanical engineers build weapons, civil engineers build targets
Thu Dec 10, 2015 6:30 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Huge pile of dead weight there unless you can adequately slave the two disks together. Some brushless driven turbo compressor as a vacuum hold down was something i was looking at towards the end _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Thu Dec 10, 2015 7:55 am
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Getting the counteracting disk spinning in the opposite direction will take some extra engineering; either gears or a serpentine belt. Its also going to take twice the energy and need a larger motor and battery; that will still apply if the disk's mass is decreased and the RPM increased.
How about that dual disk bot Counter Revolution at Battlebots? Do the disks need to be on the same axle to counteract each other or just in the same plane? The bot didn't do well at Battlebots but at least both disks are active weapons. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Thu Dec 10, 2015 9:12 am
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
in theory just the same bot would do
but you may get some funky moments the further they are apart
re KE do you really care that much is the other question?
I wouldn't do gears or anything mechanical to join them, when the weapon stops the force from the spinning disk wouldn't be nice _________________ Mechanical engineers build weapons, civil engineers build targets
Thu Dec 10, 2015 10:14 am
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
You could do it easily with bevel gears (I'd use car center diff gears).
Sorry for the horrible diagram. Yellow = spur gears, Red = Flywheel A, Blue = Flywheel B, Green = input shaft.
or a twisted belt drive akin to that in a Greenfield Ride on mower.
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Main constraint is anything will need to remove weight from the weapon itself and structure putting it at some inherent advantage vs horizontal robots. I did really want to make some super high speed internal flywheel but didn't have the skills at the time.
How about varying the speed of the disc with the steering input. _________________ Satisfaction is proportional to effort and results.
Thu Dec 10, 2015 1:26 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Probably too much inertia for it to respond rapidly and a bit wasteful, maybe if you put it on needle bearings and had some friction material instead of thrust washers that could do it _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Thu Dec 10, 2015 1:32 pm
Cpnwolfe
Joined: 29 May 2012
Posts: 454
Location: Rockhampton/qld
Zac' Odonnel had one based on friction but I cannot find the picture so I drew how it works.
picture will not upload,
just like Knights drawing except for the bevel gear it has a colson wheel _________________ Creative Instigation - Build Something Awesome!
Joined: 06 Sep 2015
Posts: 304
Location: Adelaide, SA
quote:Originally posted by Cpnwolfe:
Zac' Odonnel had one based on friction but I cannot find the picture so I drew how it works.
picture will not upload,
just like Knights drawing except for the bevel gear it has a colson wheel
If its smaller but if its coupled to weapon than its just like a flywheel putting energy into it when it takes a hit. So I wouldn't really see it as a negative. If its also not taking hits then you can make it a bit less robust so doesnt use as much weight there. And because smaller diam uses less weight at the cost of higher friction when spinning. _________________ Steven Martin
Twisted Constructions
http://www.botbitz.com
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