Yeh I plan on taking them apart and then re-reading everything you said!
Cheers,
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Yeh I plan on taking them apart and then re-reading everything you said!
Cheers,
Have you taken them apart/ruined them yet? Are they any good? I'm thinking of buying a couple for a featherweight I want to make.
From what I can tell the insides are just like any other drill, although at 12v they are at the lower end of most drill ratings. We plan on over volting them to 24v though. I'll post again when they are in the bot and running.
i personaly would only go max of 14.7v they might burn out ar 24vQuote:
We plan on over volting them to 24v
I have read both ways, overvolt to twice as much and 1.5, think ill start it at 18 and see how that goes. I figured it'll just be a lot of start stop for 3mins, so the motors will infact have very little travel. Although I could be wrong in my thesis....
In terms of charging, I currently have two 12v chargers, for each 12v battery, will using the same charger for my made up 18v (same cells) be alright?
Rule of thumb for overvolting a fairly hot wound dc motor like a drill is 1.5x rated voltage so you'd be looking at 18v.
the travel won't be much however that's irrelevant. It's all down to the current that the motor will draw. As you will have a lot of start and stops, the motors are in essence stalled for a fair bit of time, hence drawing large currents. 1.5 times the voltage will leave your drill motors too warm to touch after a battle. Believe me, I've touched them :)
No it's not ok to use a 12v drill battery charger to charge an 18v pack. Buy a decent and scrap the drill one. It's junk
ok, we plan on getting some decent cells at some point, 2-3 charge isn't going to be manageable! Are chargers voltage dependent? Would I need an 18v charger specifically? Just thinking the voltage of the packs may get modified at some point until we find whats best.
As you will see with the example here
http://www.technobotsonline.com/pro-pea ... arger.html
All decent chargers will tell you that they can charge up to a certain number of cells. Basically they are intelligent chargers, able to tell the number of cells being charged and hence they are able to charge and then automatically stop. You will find a lot of intelligent chargers require the use of a 12v power supply input. You will therefore require an external power supply to plug the charger into. There are some that plug straight into the wall but I'm not familiar with those specifically (been a while since i've had to buy a new charger!).
There a little pricey, what about just for testing? And then in the future we will look to buy new cells and chargers. The chargers for the drills would effectively being charging 7-8 cells instead of the 10 they were before. Just want to get some juice in them.