Pneumatic questions, sorry!

[Max]

Re: Pneumatic questions, sorry!

What if I used 2 of those rams side by side and then used a leverage of 2 to 1. Would that then give me the same amount of force and twice the movement at the tip of the flipper arm? And would this be enough for a decent flip of a featherweight robot?

[maddox10]

Re: Pneumatic questions, sorry!

Such 2 of those rams still have less than half the power I see as a minimum in a featherweight.

[billy breach]

Re: Pneumatic questions, sorry!

buy the one typhoon_driver has for sale. That'll solve everything and be of the relevant size of ram that is required for featherweights.

[typhoon_driver]

Re: Pneumatic questions, sorry!

It's Gary

[Max]

Re: Pneumatic questions, sorry!

could i use this ram in a fp system (giving me 1000kg of power)with a leverage of 3 or 4 to 1? would the ports be big enough?

[psychostorm]

Re: Pneumatic questions, sorry!

No, the ram is max 16 bar. Full Pressure is 60 bar

Hmm, how to tell this.

Tip force.
FP is a kind of speciality of me.
I'm happy with Hannibalito III. Ram is 51mm bore *85mm stroke, leverage 3.5 to 1.
This means, theoretical, 2.505*2.501*pi*55=1083 kg of force , with a tip power of 310 kg over 300mm.

Hannibalito I was on the low end according to me. 32mm *bore 80mm stroke. Leverage 3 to 1.
150kg tip force, over 240mm

A LP 50*45 ram, with a leverage of 1 to 1 gives you 150 kg over 45mm. (less than a fifth of the smaller FP ram of Hannibalito I)

Yeah, I don't understand that leverage ratio.
Isn't a upward flipper a class 3/C lever, at a mechanical disadvantage but increased tip speed?

[maddox10]

Re: Pneumatic questions, sorry!

No, the ram is max 16 bar. Full Pressure is 60 bar

For full pressure (1000 psi/70 bar max, but CO2 at 20°C is only 55 bar, and that will drop if it cools down during use) use you have 2 options. An hydraulic ram is strong enough to take the forces involved and is allowed. Or else a custom FP ram, with the right credentials. These custom FP rams don't grow on trees.

Isn't a upward flipper a class 3/C lever, at a mechanical disadvantage but increased tip speed?

Correct. Diminish force to gain speed.

[Max]

Re: Pneumatic questions, sorry!

sorry, meant to put in link to this ram:
https://www.easupplies.com/MILLER-50-TN ... hy1534.htm
this one is hydraulic so is rated high enough bu same questions again,

could i use this ram in a fp system (giving me 1000kg of power)with a leverage of 3 or 4 to 1? would the ports be big enough?

also, how do you weld hardox and is it the same weight per volume as normal ild steel?

[typhoon_driver]

Re: Pneumatic questions, sorry!

At that price you might aswell get a custom pneumatic cylinder made.

You weld hardox using the same methods for mild steel. Effectively yes it has the same density but type hardox density into google and you will find the exact value (it's late and I'm too tired to bother)

[Max]

Re: Pneumatic questions, sorry!

I am hoping to be able to get a similar ram at a reduced price from my dads friend. But are those ports big enough if not what size do others use?
So for hardox can you buy special 'sticks' for use with an ark welder? Also where do people get it from?

[typhoon_driver]

Re: Pneumatic questions, sorry!

http://www.google.co.uk/search?q=hardox ... =firefox-a

Seriously, google is your best friend

You can just use regular mild steel welding electrodes (sticks) to weld it

[woody]

Re: Pneumatic questions, sorry!

could i use this ram in a fp system (giving me 1000kg of power)with a leverage of 3 or 4 to 1? would the ports be big enough?

[attachment=1:3sswlq30]calc.jpg[/attachment:3sswlq30]

The cylinder you linked to has a Port Size #4 SAE = 0.172 min dia
http://www.inserta.com/PDF/AI-STR-THD-PORT-DIM.pdf
[attachment=0:3sswlq30]cv.jpg[/attachment:3sswlq30]

All the above is just a rough guide .... real world has many other variables.

EG ..Can you open the supply valve fully in less time than the math value for the ram extension time?

[Max]

Re: Pneumatic questions, sorry!

that table is awesome! but what is Cv flow?

[woody]

Re: Pneumatic questions, sorry!

Cv is a flow value / rating ... a measure of how well the fluid / gas flows thru the pipes / orifices.

http://www.ranteng.net/?page_id=12

[woody]

Re: Pneumatic questions, sorry!

You'll also find the info in my webpages.

http://www.teamonslaught.fsnet.co.uk/co2_info.htm
http://www.teamonslaught.fsnet.co.uk/pneumatics.htm