First Time Bot Builder/Buyer

[xtreme]

ill get a cpu fan and heatsink that should work right? if i got it cooled how long will i be able to run it for?

[xtreme]

would that one battery power 4 motors?

[xtreme]

Hehe look i dont wanna be this simple. ohh i asked him, he knows nothing about the radio gear or weights. there using upsidedown wheel barrows as bodies. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=020&sspagename=STRK%3AME WA%3AIT&viewitem=&item=300104293276&rd=1&rd=1http://cgi.ebay.co.uk/ws/eBayISAPI.d...STRK%3AMEWA%3A IT&viewitem=&item=300104293276&rd=1&rd=1

[ewan]

A substantial aluminum would be a good bet, and also any general cooling fan should do. Places like maplin should have suitable stocks, for example http://www.maplin.co.uk/Module.aspx?ModuleNo=32006&criteria=fan&doy=26m4http://www.maplin.co.uk/Module.aspx?...a=fan&doy=26m4 which is nice and compact for a potentially small machine also technobots have a cheap offering if youre going to be buying things from there http://www.technobots.co.uk/index.html?lang=en-uk&target=d538.htmlhttp://www.technobots.co.uk/index.ht...rget=d538.html

[ewan]

Yup, that battery would be fine, though you could do with a spare so you can charge one while the others in the robot. Those wheelbarrows look like ancient relics hehe. The windscreen wipers and batteries probably arent worth the £50

[xtreme]

better get to bed up at 6 james baker is emailing me about some second hand stuff so ill drop you a message see what ill need for my build gimson and ebay should have it all. thanks for the helpful info tonight ill be back bugging you again Cheers

(Message edited by xtreme on April 26, 2007)

[ewan]

No problem, I best be off too, oh the joys of early mornings hehe

[typhoon_driver]

I dont want to pee on anyones chips but I would be wary of relying on both a large heatsink and fan combination to keep a speed controller cool.

What you have to remember is that in a battle the motors could be be slammed from full forward to reverse and everywhere in between. A drill motor can draw relatively large currents and these will happily blow up a speed controller with a low current handling capability.

I dont want to get into a debate with anyone and this is not meant to be offensive to anyone. Just stating a few facts.

I am sure that it could quite happily be implemented but it will require a fair bit of thought to make sure you get the required air flow and keep it cool.

[grant_ploughbot]

I think these speedos have prety good current limiting, not too sure on how well but ewans done a few tests and they seem to work well lie that.

[jamesb]

you should ask mark lumb about his opinion of the sabretooth.
in my opinion, heatsinking it in the way described is pointless, as you are heatsinking the plastic case, which is never effecient anyway. secondly, the current limiter is a safety feature, and cannot be relied upon once it is hit once, to be reliable the next time.

On 2 9.6v motors at 9.6v or lower, maybe the sabretooth is ok, if you resin it to stop all the heatsinks falling off, but for 2 pairs in parallel??? No, I dont think it will be enough.

go with the 2 electronize from technobots or the 1 scorpion (scorpions are £85 from me) for this application I think, or 2 sabretooth in resin.