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Circular saw motors
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timmeh
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Joined: 20 Jul 2004
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Location: Victoria


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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.
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Post Mon Mar 06, 2006 2:10 pm 
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Shaunington III



Joined: 18 Jan 2006
Posts: 96


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Any suggestion's for motor's

Razz

Post Mon Mar 06, 2006 2:18 pm 
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timmeh
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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.
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Post Mon Mar 06, 2006 2:26 pm 
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andrew



Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W


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tr magna fan motor, super torquey, stupidy fast and wasy to work with

look at scrap and Kang, enough said
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Post Mon Mar 06, 2006 2:51 pm 
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Glen
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Joined: 16 Jun 2004
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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.

mini evs at least for a spinner.
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Post Mon Mar 06, 2006 4:41 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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Annihilation originally had 2 x RS-550 drill motors geared 5:1 with a 3.2kg tri-rotor Cool 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 Razz

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.
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Post Mon Mar 06, 2006 5:04 pm 
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NMO
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Joined: 16 Jun 2004
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Location: Melbourne


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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)

Post Mon Mar 06, 2006 5:42 pm 
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Daniel
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Joined: 30 Aug 2005
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Location: Gold Coast


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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.

Post Mon Mar 06, 2006 8:45 pm 
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wilko



Joined: 25 Sep 2005
Posts: 133
Location: Ballina N.S.W


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would those 12v orbital buffs that u plug into the cigarett lighter plug be strong enuff??
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Post Fri May 19, 2006 9:43 pm 
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