Hey guys im currently in the process of building a beetlebot and i bought 2 12v 1000rpm motors from ebay and the new scorpion 2 mini speed cont with a 14.8v lipoly 1600mah 18c batt.

i just recieved the speed cont and it looks like it can only run 1 motor??
Has anyone else bought this speed controller?

does anyone know if you can run 2 motors from this controller or will i have to buy a second scorpion?

also if i do have to buy a second scorpion will the 1 batt pack run both speed cont and motors well enough??

Cheers and thanks for any advice

Brain Dead Tradie

Do you mean this one?

It's a single channel controller, so yeah can only run one side of the robot (but you could still run two motors off it for example in a four wheel drive robot).

You'll need a second one.

That battery is massive for a beetleweight, most of us run at max 1000mah and usually a lot less, however the C rating is quite low. It'll be good to get going with but upgrading to a smaller mAh pack with a higher discharge, say 30C would be a good idea, especially if planning a spinning weapon.

All the best of luck with it!

EDIT: the scorpions are really expensive, if the cost is too high maybe consider two single channel controllers from http://www.botbitz.com/ . I run a 10A ESCheap10 Premium per side in my beetleweight on four cells and they worked fantastically.
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YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Hi and welcome to the forum!

I have used these controllers, although mine are probably the older version. The scorpion is a single motor controller, so you will need a second one to power the other motor. The battery pack is more than capable of running both motors; it should supply a continuous 28.8 amps and the motors take a maximum of about 2 amps each.

Most builders use much smaller batteries for beetleweights; I am using an 850mAH / 45C pack and most others are using between 500mAH and 1AH. The Turnigy nano packs from HobbyKing are now pretty good quality and still very cheap, so getting a smaller pack with a 25C or higher rating will allow you to save a heap of weight & space.

The other thing you could look at is Steve's hacked speed controllers; they are cheap and have a higher current rating than the Scorpions and if you are located in Queensland, the tech support should be great.

Hey guys thanks for the info!!!!
yea that is the one, well my battery pack is pretty small but if it comes down to weight issues i will buy a smaller one

No the scorpion price is fine iv ordered a second one and it is on the way ")

i have another question what do you guys reccomend as far as mounting the motors??

looking forward to the next beetle event thats for sure im in nsw btw

Thanks for all your help

Brain Dead Tradie

Have a look at these links for some inspiration:

http://www.teamrollingthunder.com/Kitbots/1000rpm_Mounts/body_1000rpm_mounts.html

http://www.teamrollingthunder.com/Kitbots/Battle_Harden/body_battle_harden.html

Looking back thru some of the build logs is sure to reveal some useful photos.

Welcome! looks like we might have two new builders at the next event (if you're coming, check out - http://www.robowars.org/forum/viewtopic.php?p=72011#72011)

Lipos are pretty light, so even a huge one like that (relatively speaking!) shouldn't be much of a hinderance. As for the drive motors i just bolted them to a bit of bunnings aluminium L bracket and wedged a bit of plastic under motor part to support it. Its worked for me thus far.

piccy (mind the broken shaft, that was my fault haha)



You can do it other ways as well, like drilling a hole through a bit of plastic and pushing the gearbox into that then cut a slot sideways in the mount to act like a clamp. Whatever way you mount them really depends on the robot i guess -



Sounds like you've got all the right parts to get started anyway. Good luck
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www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Wow !! thanks for the photos they have given me some great ideas
really hope me and my missus can make the next one Glen
You guys are great thanks again for such detailed advice

Cheers

Brain Dead Tradie

Glen's metal motor mount in the last photo is indestructable, but if metalworking like that looks difficult, then you can make much the same thing from UMHW plastic - let me know if you are interested and I can post plenty of detailed info.

Post anyway and add to Wiki.

Steve
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Steven Martin
Twisted Constructions
http://www.botbitz.com

Can't stand the wiki, I will post something on the Beetle resource page

no metal working is fine for me im a fitter machinist
would like to learn about the plastic tho

Seperate question , anyone have any advice for romote controls? the old futaba i have finally gave up the ghost lol so looking for a replacement.

Cheers

Brain Dead Tradie

The HK 2.4ghz radios are cheap and no one has had a big problem, a lot run them http://www.hobbyking.com/hobbyking/store/__295__190__Tx_Rx_Systems_Parts-2_2E4Ghz_HobbyKing.html


Otherwise Spektrum are the other popular option although most still run the old DX6 (Do not use DX6i)

Just make sure the receiver failsafes correctly. Some of the 2.4GHz have been known to failsafe in the non neutral position in order to stop planes crashing if loss of signal however many receivers are now fine.
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Remember to trust me, I am an Engineer.

http://www.youtube.com/watch?v=rp8hvyjZWHs

2nd the HK radio; it doesn't have a lot of fancy options but its the best value for money and you can always move up to Spektrum later on.

Being a machinist is a huge advantage in this hobby- what sort of work do you usually do?

ok wicked ill give them a look

prolly opt for the cheaper radio atm

we do gearboxes for the mining industry ie long travel drives and ship loaders/ with crane winches chucked in every now and then so not a whole lot of machining,
however during my course i got a copy of solid edge which is amazing for 3d modelling so that really helps when it comes to design.

Solidedge is a decent bit of CAD kit.

Quite similar to Autodesk Inventor or Solidworks (Both more common with builders here)

Should come in handy, A well designed bot is a lot easier to build.
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Remember to trust me, I am an Engineer.

http://www.youtube.com/watch?v=rp8hvyjZWHs