Pneumatics for my axe

[Guest]

Pneumatics for my axe

I looked on ebay and all the bore sizes are to small...so what about these?

http://www.pneu-store.co.uk/acatalog/Pneu_Store_Webshop_CDG1_925.htmlhttp://www.pneu-store.co.uk/acatalog..._CDG1_925.html

CDG1BN80-150
Standard Type Double Acting, Single Rod

Price: £102.77 / Euro129.83 (Excluding: VAT at 17.5%)

Does that mean its 80mm bore and 150mm stroke?

[maddox]

Pneumatics for my axe

I should expect so, but with those prices, and that brand it seems doubtfull.

SMC is good stuff.

[leorcc]

Pneumatics for my axe

Bore 80mm stroke 150mm that is correct. It says so in their documentation.

[Guest]

Pneumatics for my axe

Thanks for the help.

[woody]

Pneumatics for my axe

I looked on ebay and all the bore sizes are to small

http://cgi.ebay.co.uk/Festo-Double-Acting-Compact-Cylinder-80mm-Bore-80mm-Stk_W0QQitemZ130181963557QQcmdZViewItem?hash=item1 30181963557&_trksid=p3286.m14.l1318http://cgi.ebay.co.uk/Festo-Double-A...re-80mm-Stk_W0 QQitemZ130181963557QQcmdZViewItem?hash=item1301819 63557&_trksid=p3286.m14.l1318

[geeza]

Pneumatics for my axe

Leave it to the master.

[Guest]

Pneumatics for my axe

Thanks for that one Woody.

Looking for more like 125-150mm stroke though.

Thanks anyway.

[woody]

Pneumatics for my axe

Dan,

Your building a feather not a middleweight.
I think your going to get into all sorts of probs with such a big ram.

Do some sums on co2 consumption and the energy your Axe mech could possibly use before sending you Bot over Axe Head.

http://www.roboticgladiator.com/tutorials/ax1.htmlhttp://www.roboticgladiator.com/tutorials/ax1.html

Perhaps John will step in with some guidance for you.... he posted a quick math guide for Axe acceleration and energy the RFL Forum.

[Guest]

Pneumatics for my axe

Ok,Woody.

Do you mean weight problems?

Thanks for the link.

BTW i worked out on a pressure calculator that i would get 512 kg of force,is that good?

Cheers.

(Message edited by dan_boulton on July 25, 200

[woody]

Pneumatics for my axe

Weight of ram and axe mech ... CO2 Gas consumption = weight / mass of liquid co2 / size of required bottle etc ...all problems to be taken into account before buying things that will be no good to you.

The max velocity / accel of the head mass at a given distance is goverened by your rams force.

Once you get up to around 2 kJoules, a heavyweight robot would generally start jumping off the ground rather a lot.

Quick calc for your proposed ram.

Energy is force multiplied by distance in Newton Metres ...convert units
512kgs force = 5017 newtons
ram stroke 150mm
E = 5017 N * 0.15 m = 752.55 Nm or Joules

[woody]

Pneumatics for my axe

Dan Im no expert on the forces involved in an Axe weapon...but Id suggest that 250 joules is the max you might want to aim for.

Perhaps 60mm bore x 80mm stroke.

Edit :- A quote from a post by Mark Lumb.

Little Hitter uses an 80mm bore ram with 50mm stroke, and even though its only an axe its quite capable of throwing itself out of the arena at 10 bar

Work out the energy involved in the above ram.

(Message edited by woody on July 26, 200

[Guest]

Pneumatics for my axe

Yes im understanding pneumaics alot more now.

So without getting a smaller ram,is there anyway that i can limit the power?

Thanks.

[woody]

Pneumatics for my axe

Sure ...Just use a lower pressure.

You MUST watch the total weight of all your compenents.
So before you spend loads of money on unsuitable / heavy parts make a guesstimate of the bots final weight.

(Message edited by woody on July 26, 200

[Guest]

Pneumatics for my axe

I have a kind of guesstimate weight,about 12.5kg with all the stuff,but only 5-6mm polycarb armour.

Thick enough?

I can guess what your going to say.....lol

Thanks.

[john]

Pneumatics for my axe

u dont need armor

i would say why

but thats my secret to winning