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Team Dyrodium NSW
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dyrodium
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Joined: 24 Aug 2004
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Team Dyrodium NSW

Time for a new spinner...
Idea behind this one is it'll last longer in the local tournament!


Specs:
Weapon - Large Drum
Weapon Motor - Blue Inrunner maybe changed to the motors used in 360.
Drives - 18v connected to front wheels via large O rings (changed to timing pulleys and banebots at a later date when I can afford that...)
ESC - Sabretooth (but if that fails, probably ibc once it's fixed)
Frame - Bisalloy and/or high tensile.
Batteries - A123s

Lots of indecision as yet, but it will definitely be 4wd and have that general drum shape, being able to drive is a must!

I also intend to do a full costing list for all these people thinking of making spinners for first time bots (you know who you are xD)

It'll be updated here:
ESC - 150
Batteries - 125
Weapon motor + esc - 150

More laters. But getting started on this bot today. Smile


Last edited by dyrodium on Fri Nov 23, 2012 7:53 pm; edited 3 times in total

Post Wed Feb 18, 2009 11:15 am 
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Valen
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watchout with belt drives and using the armor as frame members.
When the thing takes a hit it can bend that plate and make the whole thing wonky , causing all the belts on that plate to run off.
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Post Wed Feb 18, 2009 12:33 pm 
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dyrodium
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Duly noted, I'm trying to work out a way to avoid that. Might just mean they're supported on one side only, but would be better than jamming up. Confused It probably won't work, but if I can use those redwheel hubs i'll have a 2.50 wheel XD They weigh nothing too.
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Post Wed Feb 18, 2009 12:54 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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Large o-rings are expensive BTW, I asked for some 6" o-rings in 1/4" and they were $20+ each Sad
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Post Wed Feb 18, 2009 12:59 pm 
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timmeh
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Timing belts can be that much too.
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Post Wed Feb 18, 2009 4:24 pm 
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Daniel
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Another non-invertible spinner?

Post Wed Feb 18, 2009 4:41 pm 
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timmeh
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From what im told the sabertooth and scorpion will not handle 4wd.
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Post Wed Feb 18, 2009 4:43 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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You could use round power transmission belt, available from McMaster a other places. You buy it by the foot and heat weld it to length - probably cheaper than an O ring. Are you counting on the rubber belt to be the tread on the rims? you could have heaps of trouble with the belt pulling off during turns.

Post Wed Feb 18, 2009 5:09 pm 
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Glen
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i think 4wd on a drumbot or vert spinner is a waste. they drive so well from the natural gyro built into them anyway. and push plenty good enough.

is mc master sending to the average customer now or are they still being a bunch of w**kers Rolling Eyes

Post Wed Feb 18, 2009 5:12 pm 
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Knightrous
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quote:
Originally posted by Daniel:
Another non-invertible spinner?


You were seriously expecting anything else from a NSW spinner Razz
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Post Wed Feb 18, 2009 5:52 pm 
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dyrodium
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The O rings could well pull off during turns, but something i'd want to try.
It is invertible, two small standoffs would let it spin too, but that's sort of pointless as it would be spinning downwards. There wouldn't be a lot of weight for that though, as the armour is not book covering and cardboard.

Again, it's just an idea, as Tim said timing pulleys cost the bomb. I might consider small O ring transmissions, just wish decent parts weren't so hard to come by Sad I'd rather avoid mcmaster...

@ Aaron - 20 per side isn't really a lot considering the price of banebots and the accompanying transmission.
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Post Wed Feb 18, 2009 6:21 pm 
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timmeh
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I picked up some pulleys im going to use for bout $18 each and the belts were normally $15 each i got a good price and in the end he threw the belts in free.
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Post Wed Feb 18, 2009 6:40 pm 
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Knightrous
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quote:
Originally posted by dyrodium:

@ Aaron - 20 per side isn't really a lot considering the price of banebots and the accompanying transmission.


They are when you can easily shred 4-5 o-rings in just 1 event. I got a small set of #25 chain and sprockets I could sell you for cheap, they could easily be adapted to work with drills.
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Post Wed Feb 18, 2009 7:51 pm 
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shreddy



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You know me too well Angus! Razz
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Post Thu Feb 19, 2009 10:29 pm 
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dyrodium
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Joined: 24 Aug 2004
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Redesign of nominator using parts available to me at home and uni workshop, also simple due to limited time before battleshed.



Thinking of using some thick ali C section for siderails, so I can replace them when they get all smashed up, and also can bolt wood/uhmw to the sides if weight allows, for spinners to... erm... nom on...

(Disclaimer - may not ever be made.)
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Post Tue Sep 01, 2009 10:49 pm 
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