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Rapture - Team Dyrodium - NSW
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Fish_in_a_Barrel



Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia


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I am guessing something like a rod magnet on the motor shaft, in a bushing and then the pulley, relying on lens' law?
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Post Thu Jun 26, 2008 4:34 pm 
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RogueTwoRobots



Joined: 12 Jan 2008
Posts: 135
Location: Irvine, Scotland


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Greetings from Scotland!

" Jake and I were talking about a very innovative magnetic coupling mechanism, the motor shaft would never get any shock"

One of the UK featherweight undercutters (Little Spinner) used a magnetic coupling mechanism the last time I saw it. It runs a mag through a set of bevel gears onto its bar, and the magnetic coupling forms the connection between the motor and the pinion bevel gear, thus reducing any shock the motor would receive from big hits.

http://i31.photobucket.com/albums/c367/ayrshirerobotics/Random/DSCN2091.jpg

It's visible in this picture; not the best image for showing close-up details but Mark Lumb or Graeme Dawson I'm sure would be more than willing to provide more info on their mechanism if you wished it (they're on the FRA forum)
I've also heard that they've got a 7kW brushless monster that they'll be using for Little Spinner 3 (FBS) and having seen that 6500W brushless motor in the link previously, I am beginning to wonder if that is what they've got their hands on Shocked
They are evil, evil people if they have Smile

Happy bot building,
Jamie


Last edited by RogueTwoRobots on Thu Jul 03, 2008 10:11 am; edited 1 time in total

Post Thu Jun 26, 2008 10:03 pm 
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RAnts



Joined: 22 Apr 2005
Posts: 10
Location: UK


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The large 6500W motor is the one I have my eye on for a FBD spinner similar in design to one found on this forum a couple of months back, with triangular 3 wheel pods. Finding a controller is difficult as most of the OPTO 200A controllers have bad reviews.

Post Fri Jun 27, 2008 4:56 am 
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dyrodium
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Joined: 24 Aug 2004
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Location: Sydney


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Thanks for that, I did think it had a magnetic clutch of some kind but the photos are quite useful!
Well update - Frame has been cut. (insert dodge phone pics)
Half are from misfortune. All the pretty ones are mine Cool .


Many thanks to Dylon for picking this lot up, i'll collect next event... this is onle of the most ambitious spinners i've ever done, so will be a long process, probably debuting at the next robowars. Smile
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Post Sat Jul 12, 2008 4:34 pm 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Bloody hell, that's a huge chunk of steel - looks like an Aussie Relic!
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Post Sat Jul 12, 2008 5:21 pm 
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dyrodium
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Laughing It was kind of the idea, they have the center part to allow for friction drive if I go down that path... And I totaly ripped off your tooth holding design Nick, but why reinvent the wheel?
On that line, i'm going to be using a localy available tool steel called "viking" it has very similar properties to S7 but is claimed to be harder and longer lasting. Whether that means it will shatter easier or not will simply come down to testing it out.

Info on it -
http://www.buau.com.au/english/files/viking-english_990104.pdf
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Post Sun Jul 13, 2008 9:13 am 
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Nick
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NP with the tooth design; you have given me plenty of ideas in the past. The Viking steel looks really promising! I think the main problem I had with the locally made teeth was in the hardening. The data sheet has some pretty specific instructions and I'd bet that most heat treaters just throw in a batch of parts and treat them all the same with a generalised process. Make sure to ask the steel seller for a recommendation on a heat treater AND send the data sheet with the parts - hope it goes well.
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Post Sun Jul 13, 2008 11:04 am 
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dyrodium
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It shouldn't be a problem, buau does their own hardening service too. In fact they can do all the machining too... Very Happy
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Post Sun Jul 13, 2008 12:54 pm 
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Nick
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quote:
Our production mills in Austria and Sweden are equipped with state-of-the-art heat treatment facilities.


Might be expensive shipping Laughing They probably have some arrangement with a local heat treatment place - the one up in Queensland seems the largest and best equipped. I will be very interested to see how this steel works out - sooner or later I will be up against something like Relic and the first bot to shatter a tooth loses.
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Post Sun Jul 13, 2008 1:51 pm 
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dyrodium
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Mmmm... well, i'm happy so far. Razz
After dylons recent success with the blue inrunners, i've decided to ditch belt drive and go for friction drive... will have to engineer it just right so I get a good rpm without excessive strain on the motor. They're very high rpm so it'll be tough. Confused
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Post Sat Jul 26, 2008 10:28 pm 
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Nick
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The shaft & bearing on those blue motors is pretty light duty, you should look at running the output to a heavier shaft with a really short timing belt - I happen to have just the thing going cheap if you are interested. I also have some really small Colson wheels you might find useful to get a large reduction

There was a post on the RFL about a 12 or 15 pound, triangular-shaped bot that had an interesting friction drive design; you could probably up-size that with good results

Post Sun Jul 27, 2008 6:53 pm 
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dyrodium
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Hey Nick, that's exactly what I was thinking... if you have something on hand, even better! Very Happy
I'm going to design these wheel modules too, before I start any heavy duty construction work.
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Post Sun Jul 27, 2008 6:56 pm 
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dyrodium
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Well, suppose I should add some to this, rapture came out pretty well from battleshed seeing as it was pretty much bundled together with zipties and duct tape. Laughing
Due to shocking belt alignment excessive strain caused the timing pulley flange to break, resulting in several embarassing belt fallings off, and cumulating in a bent ev shaft in the rumble. Embarassed
Although suffering clearance issues, the banebots provided good grip, but wore very fast. The cheap diy hubs didn't skip a beat though, very impresed!

So this leaves me with a lack of interest in spinners for now, I might try for something a little different next time. So having said that, the big bisalloy death spinner.. anyone interested in it? If you are send me a PM or make an offer. Wink
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Post Sun Sep 21, 2008 12:56 pm 
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dyrodium
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Joined: 24 Aug 2004
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First few glimpses of the lifter. No frame yet.
The front pivoting system has plenty of torque to flip and high center all them nsw boxy robots. Twisted Evil
The wedge is 6mm Bisalloy 400...

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Post Sun Nov 23, 2008 7:43 pm 
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Glen
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are those speed holes?! Surprised
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Post Sun Nov 23, 2008 9:29 pm 
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