Team Saint Robot Builds

[craig_colliass]

Each leg has 2 separate actuators, operated by 2 separate valves! if those valves were operated by Pixies would that make it OK?


Trust me anyone who says this dose not comply, will only be confirming that this (in my view ridiculous) rule was only put in place to stop innovation and diversity in the robot scene.

Anyone who wishes to stand before me and tell me this is not compliant with the WALKER RULE is a very brave man!!

[maddox10]

It is a walker mechanisme according to the rules, and it can use the extra weight allotted to it.

It would take a rule change to block this great idea.

[leorcc]

2 actuators acting independently, looks like a walker to me. And a nice mechanism at that.

[RogueTwoRobots]

If that is classed at a single degree of freedom, we've gone mad. I prefer to think of it as 2 separate planes rather than 2 DoF. If this was a 3D CAD model, for example, the legs are moving in both the X- and Y-planes, whereas something like Anarchy, Pilgrim or Spiderbot has legs that only move in one plane, or 1 DoF (as barmy as it seems that Pilgrim doesn't count as a walker).

I'd be surprised if anyone argued that this only has one DoF. It's a great build so far and kudos to Craig for tackling it.

[Anttazz]

Reckon its the best way to do it and definitely counts as a walker in my opinion (but then so should a lot of other mechanisms), otherwise we're going to make it so complicated that its beyond the reach of everyone and essentially make all robots the same. Really love the design of this.

[Shakey]

I really love how this is coming along.

Reckon its the best way to do it and definitely counts as a walker in my opinion (but then so should a lot of other mechanisms), otherwise we're going to make it so complicated that its beyond the reach of everyone and essentially make all robots the same. Really love the design of this.

I think they're already passed that point to be honest.

[craig_colliass]

Some pictures below of progress so far.

as you can see the legs are being assembled on the one side and the test rig will be stripped and useful bits transferred to the robot chassis. I still have ons leg to cut out.

IMG_2092.jpg


this gives a view of the basic size of the walker next to (over) E-Knock.

IMG_2093.jpg

[craig_colliass]

OK the question is how much pressure can a 1.25Ltr bottle of pop take before it goes, well POP!!


IMG_2095.jpg

IMG_2096.jpg

The system I'm using on the walker is very low pressure (sub 50psi) so to save weight and increase buffer storage I'm doing tests.


PLEASE NOTE
I would not advise anyone doing this, without experience with safely using compressed gas!

[terry]

Well if it's a competition and your doing it until it blows then I'm going for 185psi.

[RogueTwoRobots]

They're good for at least 50psi anyway as that's what Rex's Robot Challenge pneumatics ran drinks bottles on, and I took ours up to 75psi once (the silicone hose started to give out before the bottle).

How have you bonded the copper pipe to the bottle? That was always the weak link for me when doing the RRC stuff.

[overkill]

A guy over here used to reinforce the top of the bottle with epoxy and regularly got 120 PSI out of them.

[shakesc]

can robots as well as roboteers run on irn bru?

[overkill]

You could boil it down and make sugar rockets with it.

[craig_colliass]

I'm just using them at sub 50psi so they won't need certification under the FRA rules,

I have tried to pressurise them up to 100psi but only got to about 85psi with no problem at all (the compressor could not get much higher).


The way of fixing the copper pipe to the bottle was quite simple these bottles have an opening that is just a little smaller than the 22mm tube so with Gorilla glue or similar, I heated up the copper tube with a heat gun smeared glue inside the bottle opening and gently pushed the bottle over the copper tube and left the glue to set. they are not coming apart!


once you have a standard plumbing tube to connect to all kinds of unmodified fittings become available. I am thinking of having about 5-8 litres of storage for the weapon and the transmission. should be enough for a Feather.

[widow_twanky]

Craig, you know gorilla glue reacts to set properly with water? If you use water you can set a guitar neck under pressure from strings with it. I'm sure you know, it's great without water but it's sooooo much better with!