Pneumatic questions, sorry!

[Max]

Re: Pneumatic questions, sorry!

thanks for the reply (must have been hard to make the picture) i understand now.
i have made some simple cad drawings showing the positions of the major components and shape of the robot:
[attachment=2:2br8z8wz]flipper from side.jpg[/attachment:2br8z8wz]
[attachment=1:2br8z8wz]flipper with labels.jpg[/attachment:2br8z8wz]
[attachment=0:2br8z8wz]flipper from top.jpg[/attachment:2br8z8wz]
as you can see it should be very compact which is why i have been enquiring about custom made tanks(hard to find standard ones that will fit yet still hold enough gas) also it is not very high and invertable, thats why i can't have a very long ram. i know it doesn't need to be invertable because i can right it with the flipper and i can't use the flipper upside down but i would like to be able to move to the centre of the arena before righting my self to stop me flipping myself out of the arena! and also it won't matter if i get flipped but run out of gas.

also, i will try and find a larger buffertank but it is hard to find one that fits in the space i dedicated to it in my design but i think there is enough room if i can find a good fitting tank

[woody]

Re: Pneumatic questions, sorry!



I'd double check with Mario on the minimum TOTAL bottle length with on/off valve and adaptor/pipe work.

Number 1 is a 50 ci HPA tank, and number 5 is a 20 oz CO2 tank

http://www.catalinacylinders.com/paintball.html

4 oz

[Max]

Re: Pneumatic questions, sorry!

hi,
what is a quick exaust valve and will i need one? also i've read that some antweights use deodrant cans for main tanks but how much pressure can they take, i cant beleive that something that thin can take liquid co2 but i thought it was worth checking.

[woody]

Re: Pneumatic questions, sorry!

A QEV exhausts the gas from the cylinder quicker...you don't need one on your F.P. design.

Deodorant cans!!!..NO NO NO

Don't faff around with making a F.P. buffer ...use an existing liquid co2 bottle with the appropriate neck fittings or BUY one from a reputable builder / source.

[Max]

Re: Pneumatic questions, sorry!

ok, i'll buy one or get one made by someone like kenny, i was just finding it hard to find a bottle which fits in the design and holds enough co2. what size are the ports on a burkert 5404 valve (can't open the pdf doc. with specs on it) and what size pipe can i use with it without an adapter?

[woody]

Re: Pneumatic questions, sorry!

http://www.valves-online.co.uk/acatalog ... s_838.html

1/2 Bore pipe.

[maddox10]

Re: Pneumatic questions, sorry!

ok, I'll buy one or get one made by someone like kenny.

Will be more expensive than an adapted paintball bottle.

I was just finding it hard to find a bottle which fits in the design and holds enough co2

Adapt the design then. You're asking for the full hog , 4wheel inverted driving ,heavy armor an good flipper

what size are the ports on a burkert 5404 valve? (can't open the pdf doc. with specs on it)

The 5404 type of suitable flow comes in 2 port sizes. 1/2 BSP and 1/2 NP

and what size pipe can I use with it without an adapter?

Non. You need couplings, or were you thinking about using steel waterpipes and cast elbows?

[Max]

Re: Pneumatic questions, sorry!

i know i said i would either buy a co2 bottle or get a proffesional to make one but it does seem quite expensive so i was wondering if i could make a buffer tank by welding a disk onto both ends of a bit of aluminium pipe and then welding ports on both ends, that way it will be the size i want, have a large volume, have the correct sized ports and be able to have the co2 come in one end and out the other to prevent liquid co2 getting to the ram and freezing it?

[joey_picus]

Re: Pneumatic questions, sorry!

You need to have the parts you use certified by a responsible person in the field before any event organiser will allow them within shrapnel distance of their arena...as for deodorant cans, Anticide has used them (actually they were breath fresheners with custom adapters) but a) the maximum pressure in the system was 100psi and b) Andrew Hibberd is an experienced engineer who mostly knew what he was doing. (He is also insane, but that is beside many a point)

So although it seems expensive to get buffer tanks made, it's expensive for a very good reason...

[maddox10]

Re: Pneumatic questions, sorry!

i know i said i would either buy a co2 bottle or get a proffesional to make one but it does seem quite expensive so i was wondering if i could make a buffer tank by welding a disk onto both ends of a bit of aluminium pipe and then welding ports on both ends,

It is possible,done that in the past, got the Tshirt. But the flat ends are annoyingly heavy. Especialy if there is a hole in them for treads. The thickness of a flat end is at least trice the wall thickeness. That is why industrial tanks have round ends, stronger and lighter (and therefor cheaper) than flat end tanks.

If you're willing to sponsor me to buy or build a machine that can do this, all the roboteers troubles to get a fitting buffertank can be called history.
http://www.youtube.com/watch?v=d9jJd...1542728CAE3CD8

[Max]

Re: Pneumatic questions, sorry!

have you considered attaching 3 flamethrowers onto a lathe to make your own version of that awsume machine!
When you did it how thick did you have the end plates and the tubing and was it made of aluminium or steel?

[typhoon_driver]

Re: Pneumatic questions, sorry!

mmmm boiling oil straight out the lathe bearings not to mention the potential for warping the various parts of the lathe.

[maddox10]

Re: Pneumatic questions, sorry!

have you considered attaching 3 flamethrowers onto a lathe to make your own version of that awsome machine!

No, my lathe ain't strong enough for this kind of jobs.
@ Gary, A ceramic disk between chuck and headstock and aircooling on/in the headstock, and you won't get boiling oil. I did think about it for use with a bigger lathe.

When you did it how thick did you have the end plates and the tubing and was it made of aluminium or steel?

I can't weld ali (unless you want to give me £2200 for a propper AC/DC TIG), so it was steel or stainless steel.(done both).
Tubing-wall depends on diameter ,the bigger the diameter the thicker the wall needs to be. Coupled with the guideline 3times wall.

[Max]

Re: Pneumatic questions, sorry!

hi, i know this isn't a pneumatics question but i didn't think it was worth a new thread, has anyone ever used threaded insert (a screw with a threaded hole in the centre to screw a bolt into), this is for my drum spinner which is made of hdpe with an aluminium lid, i need them so the lid can be removed easily and thought it would be more durable than a tapped hole. i just wondered if anyone had any expiriance with them and could give me any feedback or tell me where they got them from?

[maddox10]

Re: Pneumatic questions, sorry!

Yes, I have used several systems.

As a direct answer

3 options.

Helicoil.
With visual instruction. http://www.youtube.com/watch?v=RFYa6sjhh_E

Non wire inserts. (a headless course thread bolt with treaded hole in it)

Pure custom made. (my prefered option even if it eats drills and taps in the smaller sizes, quality bolts are hard and tough steel)

A less direct answer. We* need drawings/pictures so we* can device the best solution possible inside the constraints.

* we= the ones who can answer