you won't have issues spinning it with a 2:1 ratio. Boner has used speed 900s with a 2.4:1 ratio with a 4kg drum. Spun up no issue. You could probably have gotten away with a 1:1 ratio on a kilo drum.
Gary's probably right, I've honestly not run a 900 or a drum before!
Been a while since last update because I've just been doing small jobs like the wiring and melting in nuts to hold the bearings. Progress has been halted as I am waiting to get the axels on the drum enlarged (Misread the bearings website) and also need to get the new timming pulley put on it.
Drum has been altered so tomorrow I can Mark out and cut the Ali lid and base plate and then start securing everything
I am however very annoyed that tecnobots have closed for a couple of days I need my fuses,deans and LEDs NOW!!!!!
Hi all,
Just wondering if most people cover the cooling air holes on their speed 900s or if they need the cooling, I am using it to power the drum so it will be on most the time.
yeh i cover them on any motor i use in robotics
Can I ask why that is?
shrapnel and other rubbish can get inside
I covered mine as well (although the current one is uncovered). Never had a problem with them overheating. They got warm/mildly hot but never anything extreme.
Ideally, some form of fine mesh would be a good compromise. Fine enough to cover the holes to prevent any crud from getting in, but holey enough to keep drawing in some air.
i just dont bother covering them, seems to work
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