Pneumatics for my axe

**woody** · 26th July 2008, 12:32

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

26th July 2008, 22:34

Yes im understanding pneumaics alot more now.

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

Thanks.

**woody** · 26th July 2008, 23:09

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

26th July 2008, 23:13

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** · 26th July 2008, 23:28

u dont need armor

i would say why

but thats my secret to winning

**woody** · 26th July 2008, 23:57

Care to list the pneumatic component weights Dan ?

Ram , Buffer , co2 bottle , pressure regulator , Axe and mech ,suitable 5/2 pneumatic valve ... sundry pipework and fittings.

Ultimately its your choice and if your happy go for it.

27th July 2008, 12:58

Ram-about 1.5kg?
Co2 bottle-500g
Buffer-1kg for both
Regulator-I dont know
Axe and mech-2.5kg
Valve-450g
Battery-400g
Motors-1kg
Speedos-150g?

Total:Around 7.5kg

So that gives me about 5-6kg for chassis and armour.

Which i am sacraficing for the Axe.

So 5mm to 7mm polycarb.

Some of my calcs might be a bit out,but thats around about right.

Thanks.