Wiring

[roketrhino900]

Re: Wiring

A pressure relief device (PRV) is a device that relives a set pressure if the regulator fails.

Thanks, I found that out about 5 minutes ago though! I'm getting the bottle this week, does Technobots sell rams, I might go down there in a week or two, its a half hours drive?

[Laser]

Re: Wiring

they do sell very small ones unusable for feathers, ebay is your best bet for lp rams, i got a 63mm bores x 75mm stroke one for a fiver

[roketrhino900]

Re: Wiring

Sounds like a plan, plus I'm looking for quite a large one, I want to give Matilda a handful! I have a cylinder with a volume of about a litre, I think I should be able to get a reasonably good ram, problem is I want several flips out of it, maybe ten.

[roketrhino900]

Re: Wiring

Google Sketchup just wont work, are there any other free programs to do the job?
EDIT:Also, how come when flippers fire Co2 can be seen, because I thought Co2 was invisible? This has perplexed me and my father, is it due to the pressure of the Co2?

[gizmo]

Re: Wiring

I don't know about a free alternative to google sketch up but I do know about seeing CO2, when a gas is released from a high pressure it instantly cools down with CO2 I think it freezes as CO2 only goes to liquid under pressure

[jonny]

Re: Wiring

you could use prodesktop. a very different style cad program to sketchup and needs some getting use to but imo much better.

[roketrhino900]

Re: Wiring

Thanks, and thanks to the 2 answers, I'll check out prodesktop tommorow

[typhoon_driver]

Re: Wiring

If you want a REALLY simple CAD program you can use the drawing features in excel to make a single 2D side/plan view of a machine. Just bring up the drawing menu, draw your shape, click on options and size it appropriately. Make sure to also unlatch it from resizing with the cells and then adjust the view zoom to see the whole thing.

Sounds awful simple but i've used it for a fair few work things when I've needed something drawing up quickly and scaled.

[roketrhino900]

Re: Wiring

I don't have Excel, but I'm using the open office equivalent. I've been reading the build rules, will this pneumatic system work/be legal to the rules?

Also, what force in Newtons do most LP flippers have around, I used a calculator, mine should have around 2000N? Also, I'll be using between 7-10 bar.




EDIT: Fixed the picture to include the dump valve.
EDIT 2:Fixed the picture again because I don't need the second burst disc.

[Anttazz]

Re: Wiring

Hmm, seems a bit unusual to me, but maybe you just call things different names from what i'm used to.

Having so many inputs/outputs on the tank is unusual too. Eric Jr goes:

Tank-regulator----T-------3/2 valve-prv-ram
dump valve

Hopefully thats easy enough to understand. Also, if you're running anything LP you'd be strongly advised to get a Trev Regulator, can't remember if you have been or not.

EDIT: realise it doesnt look right when posted, the T section goes to the dump valve.

[roketrhino900]

Re: Wiring

I think I've probably got some words wrong, but I thought the setup was

main tank, which has
a valve which will open at a dangerous pressure
a valve to fill it with Co2
a valve operated outside the robot to isolate the bottle when not in use

downstream there is
a valve to release the gas into the ram
a dump valve operated outside the robot

Would I need a regulator, if so it would go between the isolating valve and releasing valve? Sorry, I'm a bit useless at all this!

[Anttazz]

Re: Wiring

The main tank is generally a paintball tank, with a screw fitting at the top attached directly to a Trev reg, preferably. I believe you can buy em those tanks on the Roaming Robots page, or even ask John on here. So, it will only have one opening really.

Yes you need a regulator. It would go exactly where I put it on that drawing, screwed directly to the paintball tank, ideally.

[typhoon_driver]

Re: Wiring

A regulator takes the full pressure in your cylinder and brings the pressure down to the 7 to 10 bar you want the ram to operate at. Otherwise you are running a full pressure system.

[roketrhino900]

Re: Wiring

Simple enough, saves me a load of weight! The PRV is the pressure relief device? Just wondering, you said a 3/2 valve, meaning there is an exhaust, why is an exhaust required?
Also, the rules require an isolation valve, where does that go?

[roketrhino900]

Re: Wiring

A regulator takes the full pressure in your cylinder and brings the pressure down to the 7 to 10 bar you want the ram to operate at. Otherwise you are running a full pressure system.

Oh, I get that, so a regulator is for LP systems where you want a lower power ram, and FP systems have no regulator, so are more powerful, just need stronger components. Thanks for the great answer. The 1000psi pressure relief device required for FP systems is the PRV Antazz refferred to in the drawing?