I agree on the second point... But has the first point been proven? On paper I have much more torque...
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I agree on the second point... But has the first point been proven? On paper I have much more torque...
well the only obvious way to find out is a fight. Specifications dont prove anything, in theory alpha should have the same power as everyone else on golds, but we all know that isnt the case. Alpha is pushed to the limits in every fight (hence why ive burnt out two pairs of motors). Pushing Power isnt just about motor size, alot of factors effective the performance, all of which were included in Alphas design. Like I said the proof is in the fighting!
Ill take that statement to RC wars :)
im going bristol :P
One reason for Alphas performance may be the batteries. Very few people using those motors use them in combination with high capacity batteries.
Speed controllers also have a major effect.
as i said above, a number of factors go into the power, batteries and speedos being two. Also; gear reduction, transsmision, wheel diameter, wheel width, tyres, weight balance, speed controller settings etc.
damn :sad:... can jonno comfirm if feathers are or are not going (to Bristol)... Ive heard different stories all round...
my understanding is that only feathers with heavys are allowed to bristol.
Intereting posts about pushers there.
Alan has relaly knocked the nail on the head in terms of there are soooo many different things that make a pusher more effective than another. Not juts down to power and batteries, the scoop, wheel sizes, gearing, and grippy wheels etc. But also down to gearing and your wheels diameter depends on your batteries also. Kitty used to run on 21.6v on gold motors, but we geared her differently so shes faster as kitty dont have a scoop etc to push, so no need for pushing power, just to run around and ram the blade into people. So many litle things you need to think about depending on which batteries to get.
Mr Stu
Yeah i meant pusher :). Ok but wouldnt NiMh be good enough for a robot that uses 2 drillmotors as a pusher?
Ni-Mh will be perfectly fine for that
again, depends what motors. Drill motors come in all sizes. I have a little 9.6v drill which would work fine on NiMh, but i also have a huge 30v drill that would be alot run better on NiCads. NiMhs wont take as much abuse as NiCads.
Do you really think hes got a 30v drill???
why not? that was just an example, im sure DeWalts drills will pull alot more power then a 9.99 argos drill.
they do bigger drills you know Ewan. Im sure one of the big nipper guys has a big 32v Drill or something like that. He was well chuffed to get it and use it at Robot Crusade.
Mr Stu
I have seen a 48v drill with a 3amp sanyo ni-cd pack on it. I was so tempted to stick the battery pack in my back pocket but i didnt.
Regards
Ian
Dewalt 24V drills are rated 24V, happy on 36V if you do the dustin mod (or in their native state as long as you dont load them too much) and are 2HP peak. In other words, a slightly different league to argos £4.99 :)
my point exactly!
Very true, but Danny isnt going for a DeWalt power robot, as his budget is way too low.
that was my point
Ewan, youre so aggressive.
The drill we had was 30V from NuTool with 1.7Ah Nicads :) Very powerful drill.
Just been testing some cheap 18V drills (also NuTool) and stalling them on 12V gives 50Amps and we run them on 24V! Under stall it takes less than a second for smoke to start coming out of the motors. Another interesting point is the speed controller in the drill has 12-24V 8A printed on the side and testing it through the speed controller on stall gave 40Amps.
Problem with all drill motors is that they have too much power available for there size and can not dissipate the heat for long periods. When was the last time you ran a drill for 5 mins constantly reversing under load without burning it out? The trick is to make sure you dont use all that power usually by keeping your wheels spinning.
thats the same drill we have mark, nice and big :proud:
Thats right , i have a tight budget and have been thinking alot on a set of cheap 18V drills, i dont know the name of the company who made them but I will look that up.. Mark 40amp?! that sounds very much because i have been thinking on a set of electrolise speedcontrollers and they cant take that amout of amps for too long i think
Danny, that was 40A during stall, not nominal.
biggest & the best (motor) ??? why not a E-tek ? only $385 :-))) just a little overkill....
Slight problem!!!!
One E-Tek...23 pounds in weight..Weight limit for feathers 12Kg (26 pounds)...Think about it!!! :)
Now if you want some SERIOUS drive for your feather..forget drill motors...
http://www.npcrobotics.com/products/...at=20&mode=gfx
Geoff,
Team Scorpion
How about a LEM-2X2 in a walking featherweight?
How about a LEM 130 on 24v with a magnetic clutch drive system like Whipper :proud:
@ jeff - the thingaps do like nice on paper, but the only feather ive seen thingaps in had the gearboxes break and get beaten by a drill powered bot :proud:
Geoff, Wait until wales before you make up your mind, we might just suprise you!
Looking forward to it!!
Thin Gap..... Two x 340w(output) 12v winch motors on 24v = awesome! Only draw back is the 2.5kg each motor with the 9:1 steal planetary gearboxes.
Aaron, where did you find those winch motors? They could be quite useful to me.
Look around at your local automative stores that supply 4X4 vehicle accessories. The ones we managed to get are around $180 Aussie Brand New. They will easily drive 40-50kg around on 12v. You have to do a few mods like remove a gear reduction and make a shaft up to suit, but its simple if you know what your doing and have the tools