spinner motor help

[Laser]

What is the best brushless motor for powering a 300x30x6mm blade on a kilobot?
It will be on 11.1v.

[woody]

Re: spinner motor help

http://members.toast.net/joerger/root/spinner.xls

[craig_colliass]

Re: spinner motor help

Inertia XL & NST are to my mind some of the best spinners around and neither go for the brushless motor.
I would stick with something more reliable and easier to control. Some 150w motors would be fine.

[RogueTwoRobots]

Re: spinner motor help

150W motors might be a bit overkill on a kilobot

I think with brushless motors for kilobots/beetleweights/whatever-you-want-to-call-thems, it'll very much be a case of trial and error. There are a range of motors and controllers on GiantCod (as well as the internet in general) so perhaps just pick one that seems reasonable-ish and see how you get on.
A 300mm long spinning bar though? That's huuuuge! :shock:

[PJ-27]

Re: spinner motor help

I doubt most people will have the space or weight available for a 150w brushed motor in a Kilobot though.

I'm using a 250w 1400Kv brushless in mine, at 50g and £8 a pop you can't complain.

On the other hand though we're using some fat brushed drill motors to power our weapon in Bitza 2.

To tag on from what Jamie said, one of the main things that appeals to me about the weight class is that it's a level playing field for everyone, as its all new territory. No one knows what does and doesn't work! Also the spinning bar o my Kilobot is 320mm so I'll let you know how I get on!

[death robotics]

Re: spinner motor help

Also the spinning bar o my Kilobot is 320mm so I'll let you know how I get on!

What does it look like so far? and does it look like Hazard? if so then GRRRR!

[PJ-27]

Re: spinner motor help

What does it look like so far?

Sssshhh, big secret..... Lets just say its a near-as-makes-no-difference invertible FBS.

and does it look like Hazard?

Never heard of that robot?

[death robotics]

Re: spinner motor help

What does it look like so far?

Sssshhh, big secret..... Lets just say its a near-as-makes-no-difference invertible FBS.

[quote:3n4hfv3w]and does it look like Hazard?

Never heard of that robot?[/quote:3n4hfv3w]

Youve never heard of Hazard. let me inlighten you with this clip

http://www.youtube.com/watch?v=m_CQ5whvMl4

[Laser]

Re: spinner motor help

Just had a look at a ruler, 300mm is a bit of a overkill!
I'll proberbly go for a 6'' blade instead.
As for the motor either
http://www.giantcod.co.uk/xyh3542-1100k ... 03782.html or
http://www.giantcod.co.uk/xyh3536-1450k ... 03279.html or
http://www.cornwallmodelboats.co.uk/aca ... _3302.html
ESC
http://www.giantcod.co.uk/black-mantis- ... 02906.html
servo board

[PJ-27]

Re: spinner motor help

@Lian, haha that's awesome!

[RogueTwoRobots]

Re: spinner motor help

In that second brushless motor you linked to, there is a guy who has posted the following review:

Will not be using this item for a couple of weeks yet, will leave a review when I do
and then proceeds to give the item three stars.

Don't some people realise that reviews and the product score form an important part of research for people interested in buying? When every other review gives it five stars, why give it three stars and tarnish the overall score when you haven't even used it yet and plan on reviewing it in a couple of weeks? Jeez, some people are born with pish for brains!
Sorry, rant over.

Anyway, I reckon you're probably aware of the fact Ben but just to clarify, the Graupner motor won't be able to be used with the brushless ESC you linked to and the servo board won't be able to control the brushless motors.
The servo board will probably even be too weedy to control the Graupner motor.

[death robotics]

Re: spinner motor help

@Lian, haha that's awesome!

Thats what you can expect from a 3-time Battlebots MW champion

[Laser]

Re: spinner motor help

That guy did ruin the review.
Anyway..
I looked through my box of many things and found a 15a brushless speedo and a jp outrunner brushless.
That would work well on 11.1v. The thing is that its broken. so i would have to get a new one.
link http://www.galaxymodels.co.uk/detail.as ... C608%7C615
for armour of my kilobot I found some 4mm Lexan (is that the same kind of stuff as polycarb?)
the actual weapon disk would be run by a 1:1.5 ratio and will be a 30x6mm hardened steel bar.
It will look like NST and I think I will call it KLB.

[RogueTwoRobots]

Re: spinner motor help

If my memory serves me correctly, Lexan is just a brand name for polycarbonate (as is Makrolon).

Considering NST stands for Nasty Spinny Thing, does KLB stand for anything? Or is it just an abbreviation of KiLoBot?
Look forward to seeing it once it's built.

[Mouldy]

Re: spinner motor help

@ craig;

Brushless motors in large robots are still hit and miss at times... but when they do work its pretty obvious there far superiror to any brushed setup.... brushed still has the edge on reliability (at the moment... im working on it) lol...

Anyhow...

Brushless motors should be quite a good option for beetles, they have been proven to be reliable in this weight classs... but obviously to work out what motor you want, you need to know the following;

Weight of weapon
Gear ratio
Budget
Required performance.

If your on a budget and you disc/bar whatever isnt going to be to heavy... you could try a setup like this :
http://cgi.ebay.co.uk/2204-C2822-KV1200 ... 4aaba4fbd9

If you can spend a bit more, look at scorpion motors and castle creations esc's (two brands i rate highly. and use myself) Axi motors are also really good.

Remember... it wouldnt be a good idea to run your bar directly attached to the motor... you will want to belt drive it or something to take the shock away from the motor.