I'm trying to design an epicyclic gearbox that steps up a cordless drill's rpm ten fold (can't alter the drill itself - it's supposed to attach to the drill to power some attachments). However, I am struggling to find a suitable power value for my calculations (no drill manufacturer shares this information). How can I go about finding a suitable power output (for reference, I'm designing around an 18V, 1.5AH battery) and does it differ under no load and maximum load or should the power stay the same whereas the torque or rotational speed change?
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