Using pneumatics in a crusher?

[kevin]

This might be a stupid question but would it make sense to use pneumatics to power a crusher? I guess if it did make sense then other people would have thought of it by now.

[Eventorizon]

Re: Using pneumatics in a crusher?

Its just the principal, Pneumatics are to quick for a decent crusher and as you know air can be compressed. If you have the knowledge to make a pneumatic system then you might as well make an axe-box. It would be great to see another and would be just as damaging as a crusher if you build it right.

[maddox10]

Re: Using pneumatics in a crusher?

There is a pneumatic crusher. Heavy unfortunatly, from Sweden, called Mitril.

Uses a single acting ram with spring return with 140mm bore 150mm stroke.

8.5 tons

[kevin]

Re: Using pneumatics in a crusher?

Is there a good actuator to use? (like Venom's).

[maddox10]

Re: Using pneumatics in a crusher?

Venom uses a electric actuator.

And yes , there are a lot of good usefull electric actuators.
It all depends in your creativity and budget.

[kevin]

Re: Using pneumatics in a crusher?

Venom uses a electric actuator.

And yes , there are a lot of good usefull electric actuators.
It all depends in your creativity and budget.

How powerful are they relatively?

[maddox10]

Re: Using pneumatics in a crusher?

Depends on budget.

I'm thinking about the Gimson Linaks
It's what I would buy when needing an electric linak.

[Kenny]

Re: Using pneumatics in a crusher?

Also something to think about is the pivot ratio with crushers, you can easily get half or even a third of the power of the linear with just having a long stroke claw

[kevin]

Re: Using pneumatics in a crusher?

Also something to think about is the pivot ratio with crushers, you can easily get half or even a third of the power of the linear with just having a long stroke claw

So a short one is better I take it.

By the way, has Venom had any relative success in competitions at all?

[maddox10]

Re: Using pneumatics in a crusher?

Leverage is the main thing.

To put it simple. If the linak delivers 100 kg over 200 mm, the claw will deliver 100 kg if the movement is also 200mm.

You can exchange power for distance.

Linak 200mm movement/100kg
Claw 100mm movement/200kg

Of course, geometrics are annoying things, and if the robot hasn't a good design, the forces won't act as you would want, and then you're trying to rip appart your robot.

btw, the most powerfull pneumatic ram in a feather is probably Kennies Flow.

[Kenny]

Re: Using pneumatics in a crusher?

Also something to think about is the pivot ratio with crushers, you can easily get half or even a third of the power of the linear with just having a long stroke claw

So a short one is better I take it.

By the way, has Venom had any relative success in competitions at all?

Doesn't matter if its short or long , it as the same power, if you take cobalt for example that runs a 32mm bore cylinder at 3000psi, giving 1600kg of force on the cylinder ( See pic ) , if you look at the jaw it as holes down the back of it, when the cylinder is connected to the highest hole the jaw as less movement because its further away from the pivot point of the bottom of the jaw, where as the hole further down the jaw is closer so gives more movement , its all good having the movement but because the ratio ( closer to pivot lower ratio, further away higher the ratio ) the more power lost, you need to find a happy medium between the 2 for what you want in a crusher, do you want something to go through everything or something to grab them so you can pull and push them around the arena and maybe the pit, all things to decide on making a crusher,

Venom is good but is limited to what it can damage only being electric leadscrew, it also takes alot of power to crush through anything if you think cobalt runs 1600kg ram thats 4 times the power of the most powerful linear gimsons sells and that stuggles to damage something which is braced behind it
[attachment=0:3bgsf9ct]IMAG0283.jpg[/attachment:3bgsf9ct]

[PJ-27]

Re: Using pneumatics in a crusher?

I think the most important thing in a crusher is a front wedge that can get under anything and the drive system to back it up.
Once their wheels are off the ground, and that claw comes down, if you can move them around you're in control.
30s pin time, 3 min match, proves a good design for a winner.
Cobalt is an excellent example of this (although how you never got flipped Kenny I'll never know, jammy bar-steward)

[kevin]

Re: Using pneumatics in a crusher?

Also something to think about is the pivot ratio with crushers, you can easily get half or even a third of the power of the linear with just having a long stroke claw

So a short one is better I take it.

By the way, has Venom had any relative success in competitions at all?

Doesn't matter if its short or long , it as the same power, if you take cobalt for example that runs a 32mm bore cylinder at 3000psi, giving 1600kg of force on the cylinder ( See pic ) , if you look at the jaw it as holes down the back of it, when the cylinder is connected to the highest hole the jaw as less movement because its further away from the pivot point of the bottom of the jaw, where as the hole further down the jaw is closer so gives more movement , its all good having the movement but because the ratio ( closer to pivot lower ratio, further away higher the ratio ) the more power lost, you need to find a happy medium between the 2 for what you want in a crusher, do you want something to go through everything or something to grab them so you can pull and push them around the arena and maybe the pit, all things to decide on making a crusher,

Venom is good but is limited to what it can damage only being electric leadscrew, it also takes alot of power to crush through anything if you think cobalt runs 1600kg ram thats 4 times the power of the most powerful linear gimsons sells and that stuggles to damage something which is braced behind it
[attachment=0:g13q9v5n]IMAG0283.jpg[/attachment:g13q9v5n]

Is that right at the weight limit then?

[Kenny]

Re: Using pneumatics in a crusher?

Its at 12.2kg at the moment all in with a 5000mah lipo which is over kill, only run the jaw a few times a fight, using a pair of RS550 drive motors so it doesn't use alot of battery power, i could run on a 2500mah if i wanted to loose some weight

[kevin]

Re: Using pneumatics in a crusher?

Its at 12.2kg at the moment all in with a 5000mah lipo which is over kill, only run the jaw a few times a fight, using a pair of RS550 drive motors so it doesn't use alot of battery power, i could run on a 2500mah if i wanted to loose some weight

Does the self right mechanism involve hope?