Pneumatic antweight.

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Hogi
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Pneumatic antweight.

Post by Hogi » Sat Jun 01, 2019 2:53 pm

Hi guys. Could someone please let me know what parts I need to get a basic pneumatic system running? As far as I know I need a gas tank of some sort, a switch, some tubing and a ram. I could be missing a few things but please let me know. I was planning on using mostly lego components, are these generally good enough? Thanks.
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peterwaller
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Re: Pneumatic antweight.

Post by peterwaller » Sat Jun 01, 2019 5:45 pm

I think that about covers it but there are various switches and rams.
The switches can be electrically operated or mechanically.
The former need some sort of switched output from the controller and the mechanical ones need a small servo to operate them.
You need to make sure that in the off position the switch allows the air to escape from the ram.
Rams can be double acting that means you feed pressure in one end to operate and the into the other to return it which adds complication and uses twice as much air. You are better off with a single action with spring return. People have successfully used lego rams in the past.
Hope this helps pneumatics aren't easy but can be great.

Hogi
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Re: Pneumatic antweight.

Post by Hogi » Sat Jun 01, 2019 8:15 pm

Thanks Peter. I think the lego ones are mechanical so I was just going to use an Mg 90 servo to operate the switch. I think I also need some way of pumping it up. For that I was going to use a check valve. I have a couple of those lying around as well as a few T connectors. What are people using for gas cannisters?
Daniel Jackson.

Team Hectic.

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Super antweights: territorial.

Fleaweights: fleadom fighter, gaztons.

Featherweights: hectic (under construction)

Kyro
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Re: Pneumatic antweight.

Post by Kyro » Sat Jun 01, 2019 9:21 pm

i think i heard that someone was using mini lynx deodrant cans as a pre-charged tank... i could be wrong though...
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LimaHotel
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Re: Pneumatic antweight.

Post by LimaHotel » Sat Jun 01, 2019 11:00 pm

I saw a thing a while ago about someone repurposing nos cannisters? The little ones you get for whipping cream. I think they may be a touch heavy for an ant though
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Hogi
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Re: Pneumatic antweight.

Post by Hogi » Sun Jun 02, 2019 7:33 am

I have some spare gas bottles from my bb gun so i'll probably use one of them. The aim of this project is to make a crusher that can actually crush things rather than just holding them.
Daniel Jackson.

Team Hectic.

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Super antweights: territorial.

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Re: Pneumatic antweight.

Post by haz » Sun Jun 02, 2019 11:34 am

Yo!
Since I've been recently mucking about with pneumatics I'll add my 2p

In one of my ants ( flipper) I use a 20ml breath freshener can after a 35ml travel deodorant canister proved too heavy and cumbersome.

See: big lumpy lad,
http://imgur.com/y39IjFB
Newer tanks:
https://i.imgur.com/itNo5P7.jpg

Https://youtu.be/FGvXOxiB6eU

I also used a small nos/c02 cannister for my spikeobot. You can probably pick these up on eBay, or if you live in a slightly rough area they'll be on the ground as kids like to huff them :roll:

https://m.facebook.com/story.php?story_ ... composer=0

They're heavy and Don't hold much but they were the perfect form factor for my design so they kinda made sense to me.

I'd go with the breath fresheners as they're about £1 each and with a dutiful gob of epoxy (don't cheap out here!) They hold fine.

Cheers!

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Re: Pneumatic antweight.

Post by Kyro » Sun Jun 02, 2019 1:02 pm

yeah the ones kids huff are nitrous oxide (laughing gas or gas and air at the dentist or go fast gas for your car) its usually sold as whipped cream chargers... if purchasing any gas cartridges, id ensure they are co2 and not nitrous as i think no2 may be flammable (if fast and furious is anything to be believed)
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Esper(4wd flipper)
Mantis (2wd control bot)
Dominus (4wd flipper)
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LimaHotel
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Re: Pneumatic antweight.

Post by LimaHotel » Sun Jun 02, 2019 2:03 pm

I meant the cartridges had been modified for refilling - the flipper hadn't been built to run off nos!
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Re: Pneumatic antweight.

Post by Kyro » Sun Jun 02, 2019 3:42 pm

i was replying to the previous comment...

i had missed yours until i read back...

im away in Germany and only really checking the forum quickly when i get a spare minute so your comment must have slipped past in my rush...
Team Rocket Robotics
Esper(4wd flipper)
Mantis (2wd control bot)
Dominus (4wd flipper)
Twinzer (L&K) (cluster)
Remembering Rex (antweight cassuis)

Sometimes, i wake up grumpy... other times i just let her sleep in...

Hogi
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Re: Pneumatic antweight.

Post by Hogi » Mon Jun 03, 2019 4:42 am

Cheers guys. I'll be building this robot after the upcoming AWS now I think and probably debuting it at my event in October. It'll deffinately be an interesting project.
Daniel Jackson.

Team Hectic.

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Super antweights: territorial.

Fleaweights: fleadom fighter, gaztons.

Featherweights: hectic (under construction)

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voorsk
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Re: Pneumatic antweight.

Post by voorsk » Thu Jun 13, 2019 3:44 pm

Hogi wrote:
Sun Jun 02, 2019 7:33 am
The aim of this project is to make a crusher that can actually crush things rather than just holding them.
Aren't crushers usually hydraulic?
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Re: Pneumatic antweight.

Post by haz » Sat Jun 15, 2019 2:05 pm

I would honestly do a crusher with a massive servo and possibly an external gear reduction. I think you'll do sweet begger all with pneumatics at this scale.

Hogi
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Re: Pneumatic antweight.

Post by Hogi » Wed Jun 26, 2019 7:30 am

I might just do that then. Are there any servos you might recommend for the job?
Daniel Jackson.

Team Hectic.

Many antweights

Super antweights: territorial.

Fleaweights: fleadom fighter, gaztons.

Featherweights: hectic (under construction)

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