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the 9oz should do according to the spreadsheet. its just under twice the capacity of the ram. Any bigger than that and the robot will end up massive and complicated to plumb.
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hmmm, twice the size of the ram is on the lower side... I'd be more confident with a 3:1 ratio, otherwise you will have a large pressure drop. Maybe someone else can confirm this. Btw, the difference between a 12 and a 9 oz bottle is not that much, the 9 oz bottle measures 26cm by 5.5cm dia. the 12 oz is 26cm by 8cm dia. Regarding plumbing, if you select your components wisely you can fit the whole system in a very tight space and keep weight to a minimum.
Just as an example in my first version of my robot I used 1/2" fittings and valves throughout, need less to say the system was heavy and quite large. The new redesigned system uses mainly 1/8" fittings and valves and only where necessary did I use 1/2" parts. This way I'm to loose about 1.3kg off the pneumatic system!Comment
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Not necessarily, you only need good flow (large fittings) from the buffer tank to the ram, all the rest does not have any effect on flow. So the main plumbing and valve can be made as small as possible. The only downside I can think of is slower buffer recharge time, which I can live with.Comment
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Yeah I've already seen that before, I think it was on team onslaught website. It's helpful to get you started and point you in the right direction, but in the end the values on the spreadsheet and the real world results will be different. You'll learn as you go from your own mistakes and advice taken from others.Comment
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Industrial guideline is 5 times used volume per cycle of a machine.Originally posted by Danjr1 View Post
I use the 3 times ramvolume as a guideline. Less that that is really suboptimal.Comment
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Does anyone know of a cheap place to get LP pneumatic fittings? Every website i seem to look at is very expensive!Comment
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ebay can be goodComment
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rather stupidly, never thought of that! Cheers
If i wish to use a paintball tank as a buffer, what do people do for a fitment in place of the on/off valve or the pin valve? I'm thinking i could just drill the pin section out of a pin valve and use that?Comment
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Gerroff! They're MINE! lolOriginally posted by plargen View Post
Yeah, tons of fittings, all sizes and materials.
Last edited by Bacon Wizard; 30 April 2013, 20:41.Comment
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The paintball tanks have a not uncommon thread in the neck, according to Woodies site 5/8-18UNF.Originally posted by Danjr1 View Post
You can have the pin-valve or on/off valve replaced by an hydraulic coupling.
It's also possible to enlarge the tread to 3/8 or 1/2 bsp. but that means you'll need a recertification.Comment
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That's right use the pin valve and drill the internals out, the burst disc take it off and keep it as a spare, and the hole either blank it off or put a pressure gauge in.Originally posted by Danjr1 View Post
For pneumatic fittings I use this ebay shop, he's got metal push fittings good for 15bar, much better than the plastic ones.
http://stores.ebay.co.uk/cpmpneumatics?_trksid=p2047675.l2563
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This is how the pin valve looks like after rework. I think its the easiest way to do it, or as Mario said find a suitable hydraulic coupling...if you can...
20130501_001239.jpg20130501_001323.jpgComment
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evening all,
the valve has arrived and i was hoping that someone could explain the diagram on the side and which ports are A, R and P?
I'm a little confused as the ports on the side appear to have no difference at all (they are linked?!)by a gapping hole but from what i can gather/ guess:
The ports on the side are inlets (one would need plugging)
The port on the opposite side to the sticker diagram is the outlet to the piston
The exhaust (normally open) is up through the valve and out of where the male thread is.
Screen Shot 2013-05-08 at 22.13.10.pngScreen Shot 2013-05-08 at 22.13.24.pngScreen Shot 2013-05-08 at 22.13.36.png
Cheers
DanComment
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