So I was talking to my friends about brushless motors the other day and an idea came up: Can we make spinning weapons more reliable by increasing the MOI/weight of the rotor/pulley assembly? My reasoning behind that being a heavier pulley-rotor assembly is harder for the drive belt to stop during a weapon impact and will have a bigger tendency to slip on the belt. This way the deceleration of the weapon motor might not be as abrupt as before and might give ESCs time to react.
One of the downsides though is that the weapon is a bit harder to spin up given the additional weight.
What do you guys think?
Sun Nov 19, 2017 4:03 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
BTW I plan to do that by adding two circular steel plates on the sides of my drive pulley. I'm guessing outrunners have similar effects due to their big rotors, but they are much harder to put into my current designs.
Sun Nov 19, 2017 4:14 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
It sounds good in theory but just having adjustable belt tension weighs very little and can easily be changed for testing _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Mon Nov 20, 2017 11:35 am
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
Yeah I agree...
Btw I wonder how do you usually determine if tension is enough/too much?
Mon Nov 20, 2017 12:29 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
When the belt falls off, there is definitely not enough tension . I like to have enough tension so that I can't see the belt slipping when the weapon spins up - having a camera with a high frame rate really helps with that. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
On the topic of a bigger motor... What do you think would be a step up from the 4274 motors I'm using right now? (I'm considering using a single weapon motor in the future to reduce complexity, but I probably won't have the thickness for a large diameter one.)
Thu Nov 23, 2017 4:40 pm
maddox
Joined: 21 Dec 2006
Posts: 786
Location: Belgium
A SK3 5055 or NTM 5060 are decent options for a size bigger.
But on topic for a "integrated motor/spinner/disk". Catharsis is one of the first machines to try it, and up to date it ain't the biggest succes known.
Nick is also working on setups like that, and he's going full hog with custom titanium shafts and so on.
Tue Mar 06, 2018 9:53 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
Thx for the info.
Wed Mar 07, 2018 7:09 pm
maddox
Joined: 21 Dec 2006
Posts: 786
Location: Belgium
Delivered with pleasure. Anything that improves our opponents is a good thing. it urges us to do even better.
Wed Mar 07, 2018 7:37 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
How does an active wedge (like the one on Sewer Snake) + pneumatic spear sound? The idea is to wedge the opponent, box rush, pin against wall, and expose the bottom armor to the spear.
Came up with this idea yesterday but I figured I would never have the resources/knowledge to make it real so if anyone wants it then feel free to grab it.
Before I started building I always wanted to build a spear bot, but it comes out more complex than you'd think and I don't think there's ever been a successful spear bot - it's too hard to put enough kinetic energy into a linear movement to do damage. Even axe bots struggle to do damage with the rotational movement.
But I'm happy to be proved wrong.
Wed Apr 25, 2018 7:09 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
You are right, I don't think there's a spearbot that does actual damage, yet. Pointblank actually can do real damage, but it failed safety check twice for RobotWars. Hoever, with the aid of an active wedge, the spear can target the bottom panel, which is usually weak, and I guess in that case the bot wouldn't need a super powerful spear. (not that it would have the weight to do so after having an active wedge lol)
Wed Apr 25, 2018 11:02 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
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