i have 4 of these in our hw, just wondered what voltage is safest to run them on, and would a wotty be sufficent? batts and speedo are my next purchase, thanks.
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i have 4 of these in our hw, just wondered what voltage is safest to run them on, and would a wotty be sufficent? batts and speedo are my next purchase, thanks.
12 volts if your running four.
However wottys cant run on 12 volts and I think the min of a wotty EV is 14volts. I am not aware of any speedo which can run on 12volts.
There are those tiny speedos on ebay which can aparently handle 200 at 12volts. However didnt want to waste my money and try this as the wire was so thin that I did not beleve it.
One idea that I was playing with is run it on 24 volts and wire up the motors in series giving each motor half of the volts. However im not an electrical expert and Im not sure if thats recomended or not.
Dont run them at 24 volts. They would pull around 1.2 kw and I am not sure if a wotty 360 can handle that. Several people have blown there speedos running them at these voltages.
A safe voltage I would try is 18 volts which on paper should draw the same current as a bosch 750.
I was trying to use 4 of these in a low cost heavy weight. However it all seemed too difficult to implement and it was a lot simpler to just invest in some bosch 750s.
I think white knight uses bosch 400s be interesting how they run theres.
ok cheers marco, see what other comments people mite post to help shed light on it, i was guessing 18v myself. i have 8 of these motors and was just utilising them, 2 spare for drive and 1 spare for weapon.
np Adrian
I did quite a bit of research in trying to figure out how to drive 4 of these within a heavy.
http://www.fightingrobots.co.uk/forum.htmhttp://www.fightingrobots.co.uk/forum.htm
Here is topic where I was asking how it could be done.
lets hope i can sort it, they are already fitted lol. your link is just bringing up the forum main page
Dont seem to know how to link to other topics using this forum
Here is a pic of an old robot which didnt make it. The chassie has been seen as the cradle of Cabrakan.
http://img339.imageshack.us/my.php?image=robotbuilding042sy2.jpghttp://img339.imageshack.us/my.php?i...ding042sy2.jpg
The topic I am trying to link is called Building which is around half way down in the heavy weight topic section.
http://www.fightingrobots.co.uk/discus/messages/15/5413.html?1182795098http://www.fightingrobots.co.uk/disc...tml?1182795098
you have to right click topic and open in new tab then copy the address
Edge Hog runs 2 Bosch 400 at 18V on a sidewinder if this is of use to anyone on this thred ....
Also two motors wired in series sharing 24V will equal 12V each aprox....
cheers all, marco that chassis looks like it was coming along ok.
Just to throw a spanner in the works......2 motors wired in series....I might be totally wrong but if you were to turn sharp would 1 motor draw more power than the other? say 20v and 4 v for instance????? just wondering???
2 motors wired in series AND mechanically linked by chain , belt or gears...or even shaft to shaft effectively making ONE motor.
(Message edited by woody on February 17, 2009)
One of the problems you get with wiring in series, as i understand it is that you will be pulling the total current for both motors through each, say if the motors are pulling 50amps each than there will be 100amps flowing through each motor. I may be wrong on this though.
i would say its back to the drawing board, but these motors are fitted lol
Thanks for the kind words on the chassie Adian. It wasnt far off from completion. Around half way there.
However I calculated the speed of the motors as if they were running on 24volts so it was quite a hefty gear reduction as the motors would be going so quick. However once I realised I had to lower the voltage the robot would go really slow. Also I was running a linear actuator inside the robot which needed 24 volts so I would need an extra power supply to the weapon. In the end I just decided to scrap the build and leave it till funds were better and build a better one. Which will be Carnifex when I eventually start it.
However the old heavy weight chassie has found a good use
http://s276.photobucket.com/albums/kk1/LiamBryant_photos/Robot%20Events/Barnsley%202009/?action=view¤t=ValentinesCeilidhRoamingRobot s023.jpghttp://s276.photobucket.com/albums/k...vents/Barnsley %202009/?action=view¤t=ValentinesCeilidhRoamingRobot s023.jpg
heh heh
I might be using that chassis for my heavy, so it may yet roll into battle.
The santa hat of doom!
spent the day in the workshop today, after alot of thinking/measuring and weighing decided to fit 2 750 watt bosch motors which shouldnt be too tricky of a job, and remove the 4 400watt motors. this robot has 4 wheels, and i dont know if we should mount 1 motor at rear and one at front, or mount both at rear, (it needs to have the four wheels) but im wondering how will it drive with 2 motors at the back, and the front just free wheeling. (WOULD IT TURN?, i really doubt it) the wheels are similar to kart wheels. i didnt want to run long chains from rear to front if i didnt have to, just because im worried of snapping chains/reliability issues.
...possibly a pointless question but would belts cause the same issues as chains?
i think belts would be better yeah, alot more give in them, just wondering how much work i would need to do lol. also chains im better with as i can take links out to get the right length, but belts maybe a bit harder to source..
(Message edited by ady on February 18, 2009)
http://www.hpcgears.com/http://www.hpcgears.com/
You should be able to find any length of chain, belt etc etc on there and if not they might be able to make you something custom
ok will have a look, cheers
use a shaft and bevel gears wheel to wheel
just a thought
is 10mm mild steel tough enough for a hw as front protection,a piece along the front at the bottom like a wedge.
thanks for that pete, will have a look into that,
anyone able to help with other question regarding scoop?
(Message edited by ady on February 26, 2009)
Cabrakan was armoured in 6mm (I think) steel and it seemed to hold up incredibly well, even to Thor, so Id say so.
6mm? so hopefully 10mm will be ok,cheers, i was worried with it being the front bottom armour if it would get chewed up a bit when going head to head.
Well, we have the bulkheads made from thick HDPE which also act as frame supports, but the armour is certainly no more than 6mm steel. Thor managed to bend it in parts where it wasnt supported by the bulkheads, and eventually a combination of a hit on our link and bending the steel into the wheel disabled us, but it was all superficial damage and fixable simply with a big hammer, so yeah, I reakon 10mm steel would hold up fine, at least til the spinners come out to play.
great cheers dave, watched a vid of cabrakan looked really good, done well for a first time out hw.
I still cant believe how well it did. lol. Cardiff next!