Yeah well, aside from that. And aside from the chain coming off the sprocket and yeah... and.Originally Posted by PJ-27
Except for that one fault where the weapon motor gets stuck on, yeh it's flawless!
Well.
Well, my point still stands!
Well you got that part right.....
I forgot about the chain coming off!
Speed 900's at 10:1 sounds OK, maybe a little fast on those size wheels but will check that later.
With regards to not needing the extra power - drills are good, and they drive fast but they just dont have the grunt that sets a normal pusher apart from things like satanix and 540 that can slam people around really well. Ploughbot has got other robots out the arena by slamming them into the wall. Powerful motor's do make a big difference.
Reliability is the key though - design a solid gearbox for them and the correct ratios and you will be fine.
If I were to make a feather ram bot I would think of using 4 or 6 Gimson motors with 75mm wheels running of a battery of about 20v. This should put the speed in the golden 750 -1000 rpm
The body would be steel and as small as possible for the stuff inside, the speed controller would be Wotty100 naturally.
To make it more interesting I may add A suction fan to increase down force and grip with the exhaust out the back to help with pushing power.
But that's me.
I'd even go for four 14.4V 550 motors at 22.2V with fan & heat sink cooling on all the motors with 100mm wheels- that'd go like a rocket (in other words 10.8mph with silly-fast acceleration provided softer banebots wheels were used).
Sounds like you've got it all planned Craig
I have no idea how reliable or how well the gimson drill motor's work on 20v, but i remember Ewan saying he doesn't confirm they wont burn up at that!
The fan idea is quite a nice one, infact one that john reid has tried out for beta before. I don't know if it was just the sheer size and force he needed but john found it wasn't really possible to get the downforce needed as there were so many losses just to spin the fan up. Would be nice if you could get one to work!
Whats the power of those 550 motors ewan?
i have fitted my GR01 gearboxes with some 12v motors and am overvolting them to 18v using 75mm wheels, should be pretty fast
Power information is here http://www.gimsonrobotics.co.uk/GR01_pl ... tions.html
With over-volted 550 motors overheating can be an issue because it's all got to go through such a small package, hence why heat-sinking and ensuring good airflow about the brushes at the rear is pretty much essential for >50% voltage increases. You can still get away with it due to the quite monstrous torque of a set-up using 36:1 drill-type gearboxes with wheels a reasonable size (<120mm). In most cases you're going to be running only just past the peak efficiency point of the motors to reach wheel-spin - it's usually only when you get too far past this point by running excessively large wheels or trying to run with a jammed wheel that motors will fail.
Using this 50% voltage increases. You can still get away with it due to the quite monstrous torque of a set-up using 36:1 drill-type gearboxes with wheels a reasonable size (<120mm). In most cases you're going to be running only just past the peak efficiency point of the motors to reach wheel-spin - it's usually only when you get too far past this point by running excessively large wheels or trying to run with a jammed wheel that motors will fail.
That's a nice little calculator actually - although for the current draw it's abit optimistic! using astro's it say's i'll never get over 21A, but i know for a fact its pulling WAY more than that changing direction (peaks of 100A I can get easily)! Not seen that before, looks useful!
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