Another New Nanoweight...

If Fleaweights are just too big...

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peterwaller
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Re: Another New Nanoweight...

Post by peterwaller » Sun Feb 15, 2015 9:17 am

That is brilliant having three legs on each side seems to greatly improve the walking compared to the two I have used in the past.
When I think how many hours I have spent in the past machining cranckshaft when all I needed was a bent paper clip.
I had dug out some of my old crankshafts but because each crank was 2mm the narrowest lathe tool I had they are way to wide for a Nano.
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Might just have to think about copying that idea.

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Rapidrory
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Re: Another New Nanoweight...

Post by Rapidrory » Sun Feb 15, 2015 3:28 pm

Feel free, although it's a lot trickier than it looks; took me 4 attempts to get one right...
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Remote-Controlled Dave
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Re: Another New Nanoweight...

Post by Remote-Controlled Dave » Sun Feb 15, 2015 3:30 pm

How many snapped paperclips?
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Rapidrory
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Re: Another New Nanoweight...

Post by Rapidrory » Sun Feb 15, 2015 8:04 pm

Yeah, I chose three legs as it was the minimum number that would give a nice smooth walking motion. It's also using the silicon insulation off wire on the feet to reduce bounce and add some grip.
We had this thing charging round the attic floor for about half an hour yesterday; it's great over obstacles and though the legs got jammed once or twice, that was easily fixed by just reversing the motor briefly. Over all I'm very happy with how the design turned out. If I do it again I'll probably use slower motors though; this one could run them at about half speed before getting erratic, however this made steering kinda twitchy. I was using a Blade so couldn't wind down the travel adjust. I might try with some of those little single speed hacked worm gear motors for my actual Nano walker (which'll hopefully fit in the cube :L).

None of them snapped, just trying to get the geometries of each section of the cam equal was a pain; once it was folded there was little you can do to correct it, so it was just a case of starting again from scratch. Annoyingly the first one I did was perfect, the other one took me about 2 hours (most of which was spent learning that correcting an error was futile :p )

If i do do an ant walker, i'm going to need some bigger steel rod... I wonder if they do novelty grade paper clips? :L
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Remote-Controlled Dave
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Re: Another New Nanoweight...

Post by Remote-Controlled Dave » Sun Feb 15, 2015 8:53 pm

Garden wire or piano wire.
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Re: Another New Nanoweight...

Post by Hogi » Sun Feb 15, 2015 9:06 pm

i am aiming to get a fleaweight walker into the arena at some point. the idea is to use my mechanism design for the old ant walker project but on a slightly smaller scale. i'm hoping i'll have enough weight left to add an antweight sized servo running at full voltage with an axe on the end. could be quite effective if i can make it work.
Featherweight under construction.

Antweight to build list: 4Wd lifter, new clusterbot, secret project, walker of some description.

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Re: Another New Nanoweight...

Post by Rapidrory » Sun Feb 15, 2015 10:31 pm

Ah cheers Dave. Any idea which is stiffer? or are they both just mild steel?
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Re: Another New Nanoweight...

Post by Remote-Controlled Dave » Sun Feb 15, 2015 10:40 pm

Garden wire comes in different grades. Some of it is too flexible but the thinner grade stuff I made a robot out of before would've been great for it. And I know piano wire is the stuff Peter uses for 'spindly bits' like the mechanism on Tarantula so that should be good.

I build this abomination out of garden wire:
http://buildersdb.com/botpics/6296.jpg
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Re: Another New Nanoweight...

Post by Rapidrory » Tue Feb 24, 2015 8:57 pm

I put together a prototype for the Nano kits today... Not sure I'm hugely happy with it though. It's using a V-Tail mixer and two servo boards as the controller, all bound up with a Lemon Rx. I mean it works fine, but was very fiddly to make in comparison to the servo drive setups, and more concerningly, it's quite bulky and weighs about 15g with a switch and 50mAh battery (not included).

Image
Image

I could go back to the first-gen hacked servos as used in shark bait or this too shall fail, which are very light but quite slow, or carry on with this setup which is heavier but has the powerful drive units... I don't really want to keep stock for both types.. What do you guys think?
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Re: Another New Nanoweight...

Post by Remote-Controlled Dave » Tue Feb 24, 2015 9:00 pm

Does it NEED a switch?

I like the little servo things. Shark Bait runs well enough, even though it is slow.
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Re: Another New Nanoweight...

Post by Rapidrory » Tue Feb 24, 2015 9:17 pm

Well the batteries usually have to be hardwired in as there's no connectors on this scale, so switches are kind of a must (unless your Will and use oddly hacked connector things :L) The switch is pretty tiny so doesn't make up a significant amount of the 15g. I could always do the speed hacked servos that I did for Will's Nanos, though speed hacking is never hugely reliable..

One of the main sticking points with this is that a lot of people need onboard mixing, but it's a pain to add as mixers are comparatively expensive and bulky; I had to hacksaw about 5mm of the end of the mixer used in the prototype above so it would fit across the Lemon. I'm looking into building a dedicated Nano esc that would be single cell only, which would have on board mixing built in... that version of the kit probably won't be a thing for a while though...

I'll have another go with the current version when the bulk load of servo boards arrive...
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NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

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Re: Another New Nanoweight...

Post by Hogi » Wed Feb 25, 2015 7:23 am

i don't really mind that much. the little drive units would be good as they're faster but my current nano uses the modified servos and is fine with them if a little slow.
Featherweight under construction.

Antweight to build list: 4Wd lifter, new clusterbot, secret project, walker of some description.

Team Hectic.

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Rapidrory
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Re: Another New Nanoweight...

Post by Rapidrory » Sat Feb 28, 2015 7:07 pm

Put together a little 8g cluster bot.. This is more of a fall back plan incase I end up with 4 rollers in my ant team and need to make one a cluster, and/ or if I can't get a working Nanoweight walker. If I'm feeling inventive enough to solve those problems properly then this thing won't make an appearance at the AWS, but it's nice to have just in case :P

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NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

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Re: Another New Nanoweight...

Post by Hogi » Sat Feb 28, 2015 9:49 pm

that's well cool! :) are those the same wheels that the kits will come with?

EDIT: new idea: fleaweight lemmings!
Featherweight under construction.

Antweight to build list: 4Wd lifter, new clusterbot, secret project, walker of some description.

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Re: Another New Nanoweight...

Post by Rapidrory » Sat Feb 28, 2015 11:07 pm

It's just the front wheels and electronics from the original Minidozer; the kits are hopefully going to have 3D printed wheels.

Could enter 3 of these as a kinda Nanoweight lemmings :L
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NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

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