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Unread 31-01-2004, 00:44
ngreen ngreen is offline
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Hanging w/ pneumatics

Who is planning on using pneumatic, aka 2" bore cyclinder 170 lb retracting force, etc..., to lift their robot off the ground at the end?

I can't convince my team to do it even though I have a very clever way to make it work.

Any ideas on how you'll do it would be nice.

edit: I will be willing to share my idea considering that you aren't attending LSR (Lone star) and aren't currently qualified for national or when my team decides to not use if for sure. This method may seem controversial when used but is legal and will probably not be used by any other team, unless I can convince mine.

Last edited by ngreen : 31-01-2004 at 00:50.
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Unread 31-01-2004, 00:50
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Re: Hanging w/ pneumatics

we aren't doing this, but it would work. Attach a hook or some other way to attach to the bar on the end. Drive up to the platform. Stick the pnuematic up on a rigid arm. Drive so this is touching the bar. retract pneumatic. Make sure that you will acutally be hanging at this point. You also might want to have some sorrt of passive latch to hold you once you have retracted the pneumatic (like a gate latch), although the cylinder should hold you.
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Unread 31-01-2004, 18:07
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Re: Hanging w/ pneumatics

This has certainly been mentioned at our design meetings. It will work if you can maintain at least ~50PSI in your pneumatic system throughout.
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Unread 31-01-2004, 22:10
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Re: Hanging w/ pneumatics

Quote:
Originally Posted by KevinB
This has certainly been mentioned at our design meetings. It will work if you can maintain at least ~50PSI in your pneumatic system throughout.
We kicked around using 2" cylinder, cable ,and pullies, and pushing out. It may or may not happen. In our case time and weight will always be the deciding factors.
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Unread 01-02-2004, 01:35
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Re: Hanging w/ pneumatics

We are going to attempt to lift ourself with pneumatics on top of the ramp, then grab onto the pole. At this point, we would lower our pneumatics, and stay up. Much easier to lift the robot that way
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Unread 01-02-2004, 05:11
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Re: Hanging w/ pneumatics

we kicked the idea arround at the start of the season but have decided to go a different route.... what we were thinking was to make and arm where the pneumatic was integrated as a section of the arm...the arm would be hindged and when the cylinder is open the arm reaches over 10 ft and when it closes we hang.


another way that 1405 was thinking about but changed it was using a cabel through the center of the arm and that cabel is attched to the cylinder so it pulls the arm up and hooks on....


i'm not sure if that was clear but it is what we were thinking about
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Unread 16-02-2004, 15:45
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Re: Hanging w/ pneumatics

We are planning to use a 24" throw, 2" bore pneumatic cylinder to hoist our beast. As of Saturday we have achieved lift-off. Pretty exciting to us rookies!

Bill
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Quote:
Originally Posted by ngreen
Who is planning on using pneumatic, aka 2" bore cyclinder 170 lb retracting force, etc..., to lift their robot off the ground at the end?

I can't convince my team to do it even though I have a very clever way to make it work.

Any ideas on how you'll do it would be nice.

edit: I will be willing to share my idea considering that you aren't attending LSR (Lone star) and aren't currently qualified for national or when my team decides to not use if for sure. This method may seem controversial when used but is legal and will probably not be used by any other team, unless I can convince mine.
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Unread 16-02-2004, 15:51
ngreen ngreen is offline
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Re: Hanging w/ pneumatics

Quote:
Originally Posted by willross
We are planning to use a 24" throw, 2" bore pneumatic cylinder to hoist our beast. As of Saturday we have achieved lift-off. Pretty exciting to us rookies!

Bill
Team 1247

How well does it work. Do you have to run the compressor the whole time or can you charge to 120 psi and do it without the compressor?
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Unread 24-02-2004, 17:50
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Thumbs up Re: Hanging w/ pneumatics

Compressor! What compressor! Did your team get one? We didn't, we will have twenty kids blowing into little hoses. Look for us, we'll be the team that always looks a little dizzy...

No, seriously our compressor runs periodically as needed and we have it programmed so that the low end setting can be overridden at the joystick. So far we have always had plenty of air. Our system works like a champ! One cylinder to raise an arm, the other cylinder extends out to grab the bar and ... Voila! We are off the ground. Fairly little battery drain or heat buildup either. We can hardly wait to compete!

Quote:
Originally Posted by ngreen
How well does it work. Do you have to run the compressor the whole time or can you charge to 120 psi and do it without the compressor?
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Unread 24-02-2004, 18:25
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Re: Hanging w/ pneumatics

Our team uses a 2" bore 10" throw lifting pistol. The piston is connect to extrusions which extend to the top of the bar using a pully system. Then the piston goes to work lifting all 129.3 pounds off the ground.

PS- Our robot uses a total 7 pistons (a far cry from last years 3 piston robot)

Whats next? Using pistons for the drive train.
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Unread 24-02-2004, 18:51
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Re: Hanging w/ pneumatics

our robot is using a scissor lift with pneumatic pistons on the side. we had to get the scissors aligned correctly but it holds itself off the ground after attaching. we run our compressor with a button, so it doesnt drain the battery. now all we need to do is get it underweight
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Unread 24-02-2004, 21:33
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Re: Hanging w/ pneumatics

check us out. we use the 24" Cylinder to lift. http://www.sau53.org/net9/First/media.htm
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Unread 09-03-2004, 22:51
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Re: Hanging w/ pneumatics

We used two 13" stroke cylinders attached to a horizontal steel bar perpendicularly to pull ourselves up...
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Unread 10-03-2004, 13:32
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Re: Hanging w/ pneumatics

Quote:
Originally Posted by Greg Perkins
check us out. we use the 24" Cylinder to lift. http://www.sau53.org/net9/First/media.htm
Same here.. And we do it very well!! It juist takes a bit longer than some because of the constraints with pneumatics and our compressor does get hot!

http://www.pbase.com/image/26627878

http://www.pbase.com/image/26627877
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Last edited by Elgin Clock : 10-03-2004 at 13:35.
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Unread 10-03-2004, 15:58
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Re: Hanging w/ pneumatics

hey elgin, i dont know if you all heard about the rechargable circuit? basically, you go from your compressor, to a tee fitting, from the bottom part of the Tee, go to your double solenoid. where it comes out, go to the bottom fitting on your cylinder. then run your other tube from the fitting on the top of the cylinder, to the other fitting on that tee. the reslult is when it goes up, it will go slowly, but when it retracts, it gets 120psi, doubleing the pressure...and its all LEGAL!!!


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