Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
If you where using it with the gearbox it would be too slow really to do anything and also you would have to have some way of preventing the shock going back into the gearbox and breaking its tiny little chinese gears.
Sugest you use a belt drive if you do. _________________ Tim Team Reaper.
Mon Mar 06, 2006 2:10 pm
Shaunington III
Joined: 18 Jan 2006
Posts: 96
Any suggestion's for motor's
Mon Mar 06, 2006 2:18 pm
timmeh Experienced Roboteer
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
100watt scooter motor for something light and torquey. 2300rpm is little slow tho for a saw.
Magna motor like plan b's weapon motor and hell razers saw motor and t.n.p's saw motor. or any car fan motor really.
300watt compressor motor belt driven.
If you have weight then 200watt scooter motor geared up a bit. _________________ Tim Team Reaper.
Mon Mar 06, 2006 2:26 pm
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
tr magna fan motor, super torquey, stupidy fast and wasy to work with
look at scrap and Kang, enough said _________________ Andrew Welch, Team Unconventional Robotics
Mon Mar 06, 2006 2:51 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
actually andrew TR magna motors are the flat ones, dont direct drive those at all. the big kang style ones are from 1980s nissan skylines and pintaras. about 1.5kg.
drill motor could work, old annihilation had like 1kg of bar and two drills and that was pretty nifty back in the day. but alas when they weigh like 300g and generate only 100w < the weapon isnt gunna be that good.
Annihilation originally had 2 x RS-550 drill motors geared 5:1 with a 3.2kg tri-rotor Spin up time was nearly 20 seconds due to mass amounts of air drag, but it was hard to stop once it got moving. When we switched over to the 1.5kg mild steel bar show at RoboWars 2003, it was pretty quick to spin up
Glen is right though, a pair of Mini EV's geared around 2.5:1 to 4:1 will give a pretty nifty spinning weapon. For a spinning disc like Vertical Limits, 2.5:1 works pretty well, gives a nice top speed and still spins up quick, for a bar spinner though, I'd advise to use 3.5:1 or 4:1. _________________ https://www.halfdonethings.com/
Mon Mar 06, 2006 5:04 pm
NMO Experienced Roboteer
Joined: 16 Jun 2004
Posts: 486
Location: Melbourne
check out my build thread, (The Next Project) I've just finished a belt driven bar weapon for brisbane event running off a TR fan motor. As previously stated don't direct drive off these motors unless it's a saw blade in undercutter configuration.
The other option would be a friction drive setup using cheap bunnings plastic wheels, it run's OK if setup properly (Mine wasn't and the vital bits where to easy to get to by other robots)
Mon Mar 06, 2006 5:42 pm
Daniel Experienced Roboteer
Joined: 30 Aug 2005
Posts: 2729
Location: Gold Coast
Prancing Queen uses 2 mini EV's to spin its 3.5kg dome.
I have also used a RS-540, which is smaller then a drill motor, to drive a circular saw. Is used a model airplane wheel for friction drive onto the side of the saw at about 2:1. I don't know what the top speed was but it took about 6 seconds to hit it and the 180mm saw blade managed to launch a 1kg tool box about 1m into the air when we ran it a 12V. I have a video of it on my computer, if I can remember where it was.
I've always wanted to try the same setup with two drill motors onto a 250mm saw blade at 24V.
would those 12v orbital buffs that u plug into the cigarett lighter plug be strong enuff?? _________________ WHEN YOU GO TO COURT YOU'RE TRUSTING YOUR FATE TO TWELVE PEOPLE
WHO AREN'T SMART ENOUGH TO GET OUT OF JURY DUTY
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