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a viable gear idea? antweight repeating axe/hammer


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broox



Joined: 02 Feb 2017
Posts: 3


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a viable gear idea? antweight repeating axe/hammer

Had our first hand encounter at adelaide robot combat the other week. kids loved it, and want to get into the bots. We've ordered a couple basic kits to get them started, and in the future plan to modify them for some active weapons.

That got me thinking about an axe/hammer style weapon (even though you probably don't see many in antweight)

The original idea came from a sprinkler style gear (pretty cool)
http://i.imgur.com/dhJkIU5.gif
good repeating action, but there wouldn't be much power in that.


Then I was thinking of a mousetrap action, a lot of power for not much weight.
Could I use a gear to prime a torsion spring? and then it would make it act like a repeating axe/hammer, but with some power!

Would this be viable?
I had to do it on paper to visualise how it would work.

https://youtu.be/ug6h5dYlyqs

I haven't worked out the exact gear ratio or size, (don't know how to work that out yet) but just floating an idea.

Cheers!
look foward to learning more and building soon.

Post Mon Feb 06, 2017 10:15 pm 
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Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11740
Location: Sydney, NSW


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I don't see why that wouldn't work, at least in theory. The main problem is getting enough torque out of a tiny motor in a very low 150 gram weight limit. A motor like this might do the job: https://littlebirdelectronics.com.au/collections/dc-gearmotor/products/1000-1-micro-metal-gearmotor-hp



There isn't any info on it's torque so you will need to do some experiments with your torsion spring power.
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Last edited by Nick on Tue Feb 07, 2017 7:35 am; edited 1 time in total

Post Tue Feb 07, 2017 12:10 am 
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evil_steve



Joined: 06 Sep 2015
Posts: 296
Location: Adelaide, SA


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I've seen one of the guys in the UK do it (one of the builders of Nuts in Robot Wars), the reddit thread is here. He 3D printed a mechanism just like the sprinkler one you linked, so it can certainly work.



Not sure the best motor for it though - for a spring mechanism you'd want a high torque motor but if you go that sprinkler gear style you might do better with a brushless and aim for repeating rapid hits - you could call it Angry Woodpecker Smile

Post Tue Feb 07, 2017 7:29 am 
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broox



Joined: 02 Feb 2017
Posts: 3


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Cheers for the replies, its good to get some feedback.


Steve,
I've seen that reddit thread and it looks cool, but seems to lack some oomph. doesn't look like it'd have much damaging power. I could be wrong though.

Post Tue Feb 07, 2017 8:24 pm 
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broox



Joined: 02 Feb 2017
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with these antweight bots, roughly how much spare weight do you have to play with once you have a basic running chassis?

Post Tue Feb 07, 2017 8:35 pm 
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shakesc



Joined: 14 May 2012
Posts: 60
Location: UK


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pop over to http://www.robotwars101.org/forum/ to see a lot of antweights

Shakey on there builds (prints) alot including fleas (25g)

Post Wed Feb 08, 2017 6:31 am 
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evil_steve



Joined: 06 Sep 2015
Posts: 296
Location: Adelaide, SA


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Fleas are 75g, Nanoweights are 25g, and those UK guys build some amazing bots in those sizes.

It terms of weight - it really depends what parts (ESC(s), receiver, battery, wheels) you choose, and how you build. I very much throw a design together and then try and make it meet weight.

Post Wed Feb 08, 2017 6:58 am 
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